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Attine ants are a monophyletic group comprising more than 230 species, distributed exclusively in the New World. All higher Attini ants depend on the cultivation of fungus gardens for food, and those gardens are continuously exposed to alien microorganisms. The present work describes, for the first time, the composition, relative frequency and the richness of the fungal species comprising the mycobiota from the garden of the most abundant Acromyrmex species from different regions of Argentina. We also compared, using a multivariate approach, the mycobiota composition with the purpose of testing two hypotheses: 1) whether mycobiota is defined by the ant species, or 2) whether mycobiota is determined by the geographical region. We found that each fungal community had a particular composition and abundance: the species that were highly frequent in a community or site, could be rare or altogether absent in another community or site. Species richness, as well as the theoretical maximum richness, also changed with locations. Furthermore, we found that different ant species at the same site had similar mycobiotas, whereas the same ant species in distant locations had only a few fungal species in common. Therefore, we concluded that mycobiota composition changed considerably with geographical site and was not dependent on the ant species. Our results provide an additional understanding of the leaf cutting-ants system, confirming that the garden of leaf cutting ants nests is a complex and dynamic fungal community which is dependent on the site where it was located. Las hormigas de la familia Attini son un grupo monofilético que incluye más de 230 especies distribuidas exclusivamente en el Nuevo Mundo. Todas las hormigas Attini superiores se alimentan de un hongo que cultivan dentro de sus nidos, y los cultivos de este hongo se encuentran continuamente expuestos a microorganismos exógenos a la colonia. Este trabajo describe por primera vez la composición, la frecuencia relativa y la riqueza de las especies que conforman las micobiotas encontrada en los jardines de las especies del género Acromyrmex más abundantes en diferentes regiones de la Argentina. También comparamos, mediante métodos multivariados, la composición de la micobiota con el propósito de poner a prueba dos hipótesis: 1) la micobiota está definida por las especies de hormigas, o 2) la micobiota cambia en función de la región geográfica. Se pudo observar que cada comunidad fúngica tuvo una composición y una abundancia de especies particular; las especies más frecuentes en un sitio o comunidad fue una especie rara o poco frecuente en otra comunidad o sitio. La riqueza de especies y la riqueza máxima teórica también cambiaron con los sitios. Además, encontramos que diferentes especies de hormigas en el mismo sitio tuvieron micobiotas similares, mientras que las mismas especies de hormigas en locaciones distantes tuvieron sólo unas pocas especies fúngicas en común. Por ello, concluimos que la composición de la micobiota cambia considerablemente con los sitios geográficos y que este cambio no depende de las especies de hormigas. Nuestro resultado provee nueva información sobre las hormigas cortadoras de hojas, y confirma que el jardín de estas hormigas es una comunidad fúngica muy compleja y dinámica.

Las hormigas de la familia Attini son un grupo monofilético que incluye más de 230 especies distribuidas exclusivamente en el Nuevo Mundo. Todas las hormigas Attini superiores se alimentan de un hongo que cultivan dentro de sus nidos, y los cultivos de este hongo se encuentran continuamente expuestos a microorganismos exógenos a la colonia. Este trabajo describe por primera vez la composición, la frecuencia relativa y la riqueza de las especies que conforman las micobiotas encontrada en los jardines de las especies del género Acromyrmex más abundantes en diferentes regiones de la Argentina. También comparamos, mediante métodos multivariados, la composición de la micobiota con el propósito de poner a prueba dos hipótesis: 1) la micobiota está definida por las especies de hormigas, o 2) la micobiota cambia en función de la región geográfica. Se pudo observar que cada comunidad fúngica tuvo una composición y una abundancia de especies particular; las especies más frecuentes en un sitio o comunidad fue una especie rara o poco frecuente en otra comunidad o sitio. La riqueza de especies y la riqueza máxima teórica también cambiaron con los sitios. Además, encontramos que diferentes especies de hormigas en el mismo sitio tuvieron micobiotas similares, mientras que las mismas especies de hormigas en locaciones distantes tuvieron sólo unas pocas especies fúngicas en común. Por ello, concluimos que la composición de la micobiota cambia considerablemente con los sitios geográficos y que este cambio no depende de las especies de hormigas. Nuestro resultado provee nueva información sobre las hormigas cortadoras de hojas, y confirma que el jardín de estas hormigas es una comunidad fúngica muy compleja y dinámica. Attine ants are a monophyletic group comprising more than 230 species, distributed exclusively in the New World. All higher Attini ants depend on the cultivation of fungus gardens for food, and those gardens are continuously exposed to alien microorganisms. The present work describes, for the first time, the composition, relative frequency and the richness of the fungal species comprising the mycobiota from the garden of the most abundant Acromyrmex species from different regions of Argentina. We also compared, using a multivariate approach, the mycobiota composition with the purpose of testing two hypotheses: 1) whether mycobiota is defined by the ant species, or 2) whether mycobiota is determined by the geographical region. We found that each fungal community had a particular composition and abundance: the species that were highly frequent in a community or site, could be rare or altogether absent in another community or site. Species richness, as well as the theoretical maximum richness, also changed with locations. Furthermore, we found that different ant species at the same site had similar mycobiotas, whereas the same ant species in distant locations had only a few fungal species in common. Therefore, we concluded that mycobiota composition changed considerably with geographical site and was not dependent on the ant species. Our results provide an additional understanding of the leaf cutting-ants system, confirming that the garden of leaf cutting ants nests is a complex and dynamic fungal community which is dependent on the site where it was located. Fil: Marfetan, Jorge Ariel. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Hormigas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Folgarait, Patricia Julia. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Hormigas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina

1. Parasitoid–host interactions are important components of ecological communities. Although parasitoid–host interactions are strongly shaped by evolutionary history, the abundance of both the parasitoid and the host may have a role in determining the nature of the interaction once phylogenetic relationships are considered. 2. Leafcutter ants are hosts of phorid parasitoids and represent a well-defined and specialised module within a larger network of ant–symbiont interactions. A low specificity host taxa and a positive association between host abundance and parasitoid interaction frequency were expected due to the close phylogenetic relatedness of the hosts. 3. The interactions among all species of leafcutter ants and their parasitoids were quantified in two localities with different species richness. This study also characterised the spatial-temporal variability of these interactions, determined the patterns of parasitoid specificity and host selection, and tested for an association between host abundance and parasitoid interaction frequency. 4. Contrary to expectation, most parasitoid species were highly specialised and interaction frequency for parasitoid species was not related to host abundance. All host ant species were attacked by more than one phorid species. Some phorid species used more than one host species and showed preference for the same species over space and time, suggesting that there are physiological and/or behavioural restrictions on host use. 5. These results show that there is a tendency for specialisation even when hosts are highly similar in their ecology. From a biological control perspective, these parasitoids may be effective candidates, due to the high specificity of some species and little host-use variation through time. Fil: Elizalde, Luciana. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Hormigas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina Fil: Patrock, Richard J. W.. University of Cambridge; Reino Unido Fil: Disney, R. Henry L.. Texas A&m University Kingsville; Estados Unidos Fil: Folgarait, Patricia Julia. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Hormigas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina

Este trabajo tiene como objetivo la identificación morfológica y molecular de cinco especies de Trichoderma asociadas con los nidos de hormigas cortadoras de hojas del género Acromyrmex presentes en Argentina. Las especies identificadas fueron: T. lentiforme, T. inhamatum, T. virens, T. koningiopsis y T. aff. neotropicale resultando éste el primer registro de T. lentiforme y T. inhamatum asociados a hormigas cortadoras de hojas Acromyrmex, en particular Acromyrmex lobicornis y Acromyrmex lundii para el primero y de A. lobicornis para el segundo. Además T. lentiforme representa el primer registro para la Argentina. En este trabajo se amplían medidas del conidióforo y conidios y se aportan datos adicionales sobre la distribución de las especies de Trichoderma en el país. Se ilustran con fotografías los conidióforos, células conidiógenas, conidios y el fenotipo de la colonia para cada especie. The aim of this work is the morphological and molecular identification of five species of Trichoderma associated with leaf-cutting ant nests of the genera Acromyrmex present in Argentina. The species identified were T. lentiforme, T. inhamatum, T. virens, T. koningiopsis and T. aff. neotropicale resulting in the first record of T. lentiforme and T. inhamatum associated with leaf-cutting Acromyrmex ants, in particular with Acromyrmex lobicornis and Acromyrmex lundii for the first one and with A. lobicornis for the second one. Moreover, T. lentiforme represents the first record for Argentina. In this work we extend the measurements of the conidia and the conidiophore and contribute with additional of the distribution of the species of Trichoderma in this country. Photographs illustrating conidiophores, conidiogenous cells, conidia, and colony phenotype are provided for each species. Fil: Armando, Natalia Giannina. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Hormigas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Marfetan, Jorge Ariel. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Hormigas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Folgarait, Patricia Julia. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología. Laboratorio de Hormigas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina

Pseudacteon notocaudatus new species Fig. 1 Pseudacteon sp. near disneyi, Calcaterra et al. 2005 Pseudacteon disneyi (in part), Patrock et al. 2009 Diagnosis. Females: most similar to P. pradei (Fig. 2), but P. notocaudatus differs in having the terminal (posterior) segment of the oviscape with a distinct constriction (notch) ahead of the broadened arc on the apical structure, while P. pradei lacks such constriction (Figs. 1 & 2). Both P. notocaudatus and P. pradei have two short lateral points on the apical structure, and this feature differs from the similar species P. disneyi Pesquero 2000 (Fig. 3) and P. arcuatus Borgmeier 1969 (Fig. 4) that both have longer, wider lateral expansions of the apical structure. Males: unknown. Female. Body length including oviscape 0.95 mm (paratype range 0.88���1.01 mm), thorax width 0.41 mm (paratype range 0.33���0.42 mm). Wing length 1.10 mm, width 0.48 mm. Body color dark grey brown, frons dark grey. Palpus pale yellow. Flagellomere 1 orange brown, flattened in cross section, conical with distal half forming a tapered tip, microscopically pubescent, tapered tip with lateral fringes of longer setae. Arista absent. Frons with 2 - 2-4 - 4 setae and 1 pair of supra-antennal setae. Scutellum with 2 pairs of setae, posterior pair over twice the length of fine anterior pair. Costa with 12 pairs of short 0.03 mm setae. Halter light brown, cream below. Legs pale yellowish brown. Abdomen: Tergite 6 light grey with 3 bristles on each darker lateral patch. Sternite 6 chitinized dark brown, with 2 pairs of long (0.12 mm) medial setae and 3 shorter (0.06 mm) lateral setae on each side. Oviscape comprises two parts. Anterior portion (0.3 mm long) somewhat triangular in dorsal view, spreading from a narrow proximal base (0.06 mm wide) and terminating distally with inwardly curving, hooked lobes on each side (0.19 mm wide). Two fine setae on each side of outer dorsal face. Posterior apical structure (0.12 mm long) extending beyond anterior process, flat in lateral view, broadens in dorsal view from attachment point (0.04 mm wide) until about twice width (0.08 mm), then has a constriction or "notch" (0.06 mm wide), before broadening again and terminating in a curved expansion with short, sharp lateral tips (0.115 mm tip to tip). In lateral view, the apical structure lies at an obtuse upward angle compared to the anterior portion of the oviscape. Distribution. Found in Tucuman and Salta provinces of northwestern Argentina. Records of P. pradei and P. disneyi from Bolivia and nearby regions of Brazil (Patrock et al. 2009) may be of this new species. Etymology. The species name means ���notched tail��� in Latin, so named for the distinctive constriction of the apical process of the oviscape. Holotype. ♀, ARGENTINA: TUCUMAN: Graneros, 27.651 �� S, 65.464 �� W, 15.v. 2012, G.A. Montenegro, over S. invicta nest, BFL- 110564 (MACN). Paratypes. ARGENTINA: TUCUMAN: Graneros, 27.651 �� S, 65.464 �� W, 3 ♀, 15.v. 2012, G.A. Montenegro, over S. invicta nest (UTIC); Los Sueldos, 27.112 �� S, 65.276 �� W, 1 ♀, 1.iv. 2010, G.A. Montenegro, over S. invicta nest (PJF); SALTA: Bella Vista, 27.752 �� S, 65.950 �� W, 2 ♀, 15.i. 2011, G.A. Montenegro, over S. interrupta nest (UTIC); El Carancho, 25.831 �� S, 64.996 �� W, 1 ♀, 1.vii. 2011, G.A. Montenegro, over S. interrupta nest (UTIC); La Palata, 25.750 �� S, 64.950 �� W, 1 ♀, 1.i. 2011, G.A. Montenegro, over S. interrupta nest (LACM); Palo Quemado, 26.110 �� S, 65.269 �� W, 1 ♀ (UTIC), 27.iii. 2013, G.A. Montenegro, over S. interrupta nest (UTIC). Remarks. Found attacking Solenopsis invicta and S. interrupta workers at disturbed mounds, especially on workers that were active on low grass and sticks close to the place of disturbance. Has not been found at foraging trails. The distinctive notch on the apical structure of the oviscape serves to differentiate this new species from closely related congeners, especially P. pradei. Separation of these species in the field using a hand lens would be difficult given their extremely small size. However, the morphological differences are stable within species. The geographical ranges of each species appear to be non-overlapping but are still to be fully explored, and we speculate that they may be associated with range limits of host ant species., Published as part of Plowes, Robert M., Folgarait, Patricia J. & Gilbert, Lawrence E., 2015, Pseudacteon notocaudatus and Pseudacteon obtusitus (Diptera: Phoridae), two new species of fire ant parasitoids from South America, pp. 215-220 in Zootaxa 4032 (2) on pages 215-217, DOI: 10.11646/zootaxa.4032.2.8, http://zenodo.org/record/241763, {"references":["Calcaterra, L. A., Porter S. D. & Briano, J. A. (2005) Distribution and abundance of fire ant decapitating flies (Diptera: Phoridae: Pseudacteon) in three regions of southern South America. Annals of the Entomological Society of America, 98, 85 - 95. http: // dx. doi. org / 10.1603 / 0013 - 8746 (2005) 098 [0085: daaofa] 2.0. co; 2","Patrock, R. J. W., Porter, S. D., Gilbert, L. E. & Folgarait, P. J. (2009) Distributional patterns of Pseudacteon associated with the Solenopsis saevissima complex in South America. Journal of Insect Science, 9, 1 - 17. http: // dx. doi. org / 10.1673 / 031.009.6001","Pesquero, M. A. (2000) Two new species of Pseudacteon (Diptera: Phoridae) parasitoids of fire ants (Solenopsis spp.) (Hymenoptera: Formicidae) from Brazil. Journal of the New York Entomological Society, 108, 243 - 247. http: // dx. doi. org / 10.1664 / 0028 - 7199 (2000) 108 [0243: tnsopd] 2.0. co; 2","Borgmeier, T. (1969) Bredin-Archbold-Smithsonian biological survey of Dominica: the Phoridae of Dominica (Diptera). Smithsonian Contributions to Zoology, 23, 1 - 69. http: // dx. doi. org / 10.5479 / si. 00810282.23"]}

Pseudacteon obtusitus new species Fig. 5 Pseudacteon obtusus, Orr et al. 1997 Pseudacteon obtusus, Morrison & Gilbert 1999 Pseudacteon obtusus (small form), Porter and Pesquero 2001 Pseudacteon obtusus (small form), Folgarait et al. 2005 Pseudacteon obtusus (small form), Kronforst et al. 2007 Pseudacteon nr. obtusus, Folgarait et al. 2007 a, b Pseudacteon “mini” obtusus, Feener et al. 2008 Pseudacteon nr. obtusus, Patrock et al. 2009 Diagnosis. Females: distinguished from the similar P. obtusus (Fig. 6) by the smaller size of P. obtusitus. The width of the oviscape in P. obtusitus ranges from 0.17 to 0.2 mm (N= 22) while P. obtusus oviscape width is from 0.25 to 0.31 mm (N= 16). The flagellomere 1 of P. obtusitus is conical and tapering with a fringe of fine hairs and a short or absent arista, while P. obtusus has a broader flagellomere 1, terminating in a long or short arista. Males: unknown. Female. Body length 0.86 mm (paratype range 0.72 – 0.01 mm), thorax width 0.35 mm (paratype range 0.28 – 0.40 mm). Wing length 0.9 mm, width 0.42 mm. Body color dark orange brown, frons dark grey. Palpus pale yellow. Flagellomere 1 pale brown, flat, conical tapering toward arista, microscopically pubescent, fringe of fine hairs either side of tapered tip, overall 0.18 mm long, extending about ¾ of the eye width. Arista, fine, up to one quarter the length of flagellomere 1 (but absent in some specimens). Frons with 2 - 2-4 - 4 setae and 1 pair of supra-antennal setae. Scutellum with 2 pairs of setae, posterior pair over twice the length of fine anterior pair. Costa with 14 pairs of dark 0.035 mm setae. Halter pale yellow brown. Legs pale yellow brown. Abdomen: Tergite 6 dark brown, 2 fine setae on each lateral margin. Sternite 6 with a pair of medial setae, and 2 – 3 fine short setae on each side toward lateral margin. Oviscape in dorsal view broad, with two side lobes alongside the median lobe. Each side lobe sclerotized, rounded tip, with a small hyaline "tail" extending from the distal inner edge toward the median lobe. Hyaline tails terminate with an outward twist. Median lobe may act as a guide for the retractable stylet which passes between the straight dorsal plate and the down-curved ventral plate. 4 fine setae along each joint line between side and median lobes. Overall oviscape length 0.24 mm. Width across widest part at lobe tips 0.18 mm (paratype range 0.17 to 0.2 mm). Distribution. La Plata basin of Argentina and Paraguay to São Paulo and Mato Grosso states, Brazil (Patrock et al. 2009). Etymology. The species name implies “small obtusus ” by combining “ obtusus ” with the Latinized form of the colloquial Spanish diminutive “-ito”. Holotype. ♀, ARGENTINA: SANTA FE: Romang, 29.512 º S, 59.744 º W, 6.ii. 2009, E.G. LeBrun, over S. invicta nest, BFL- 110739 d (MACN). Paratypes. ARGENTINA: FORMOSA: Herradura, 26.518 º S, 58.287 º W, 1 ♀, 29.xi. 2003, E.G. LeBrun, over S. invicta nest (LACM); MENDOZA: La Consulta, 33.73 º S, 69.12 º W, 3 ♀, 22–26.i.2007, 5♀, 15–19.i.2007, 4♀, 5– 9.ii.2007, 3♀, 26.ii– 2.iii. 2007, S. Lanati, malaise trap (LACM); SANTA FE: Ocampo, 28.506 º S, 59.262 º W, 1 ♀, 6.xii. 2003, E.G. LeBrun, over S. invicta nest (LACM); Romang, 29.512 º S, 59.744 º W, 2 ♀, 6.ii. 2009, E.G. LeBrun, over S. invicta nest (UTIC); BRAZIL: MATO GROSSO: Caceres Field Station, 16.5 º S, 57.0º W, 1 ♀, 18.iv. 1989, D. Williams, attacking Solenopsis (LACM); SÃO PAULO: Campinas, near Santa Genebra Reserve, 2 ♀, 22.821 º S, 47.105 º W, xi. 1995, L.E. Gilbert, attacking along Solenopsis invicta foraging trail (LACM). Remarks. P. obtusitus has been collected over S. invicta but has not been encountered with S. richteri, the type-host of P. obtusus. P. obtusitus may occur at both disturbed ant nests and along foraging trails (Orr et al. 1997, Seike 2002, Folgarait et al. 2007 b, Feener et al. 2008). One study (Orr et al. 1997) found P. obtusitus more abundant on foraging trails (13 / 21 P. obtusitus/total flies) than at disturbed mounds (5 / 46 P. obtusitus/total flies). Borgmeier (1925) described P. obtusus from material collected by Bruch at La Plata, Argentina on S. richteri. Borgmeier’s measurements make clear that P. obtusus is a large species and we found that the oviscape width of P. obtusus was consistently 0.25 to 0.31 mm, while the smaller bodied P. obtusitus has a small oviscape, not overlapping in size with P. obtusus. In earlier laboratory trials of cross mating between large P. obtusus and the smaller P. obtusitus, it appeared that mating failed since females did not go on to oviposit in host workers (P.J.F. unpublished). None of the cultures of P. obtusus reared in the United States have resulted in emergence of P. obtusitus (S.D. Porter pers. comment). Strong evidence of specific differences comes from the DNA molecular analysis of Kronforst et al. (2007), which shows a clear separation of their “small obtusus ” (P. obtusitus) from the larger haplotypes of P. obtusus. The variable shapes and pubescence of the flagellomere 1 and lengths of aristae of the “ obtusus ” group need further taxonomic investigation, as do the two pattern forms of P. obtusus reported by Porter & Calcaterra (2013). It is important to emphasize that in advance of P. obtusitus being designated a formal Latin binomial name this species has long been treated as a separate species in biocontrol specificity tests and introductions based on size and molecular distinctiveness (Porter & Gilbert 2004, Plowes et al. 2011, Porter & Calcaterra 2013).

Leafcutter ants are considered the most important herbivores in the Neotropics. Atta vollenweideri is a rangeland pest that competes with cattle for grass, reducing the carrying capacity of pastures. However, there is much controversy regarding their degree of herbivory, pest status and competition with cattle. Furthermore, their economic injury level (EIL) has not been determined. We studied A. vollenweideri in competition with cattle in a natural pasture in Argentina, quantifying primary productivity, as well as herbivory by ants alone and together with cattle. Productivity and herbivory by ants were contrasted with cattle dietary requirements under two grazing regimes. We estimated the first EIL for leaf-cutting ants in rangelands. Productivity was highly variable throughout the seasons. Competition between ants and cattle was evident during the low productivity periods, with evidence of ants being more affected by cattle unless ants store food during the productivity peak in summer and autumn. The EIL was 0.29 ant nests per hectare, although it likely overestimates the importance of these ants as pests. We discuss the shortcomings of a classic EIL formula for estimating the damage potential of social insects. Fil: Guillade, Andrea Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes; Argentina Fil: Folgarait, Patricia Julia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes; Argentina

This review updates and summarizes the current knowledge about the interaction of leaf-cutter ants and their parasitoids by providing comparable data for Acromyrmex and Atta ants. First, an overview of the relevant aspects of the biology and taxonomy of leaf cutters and of their parasitoids is provided. Second, I show the peculiarities of the parasitoids attacking behaviors towards their host as well as the responses or ant defenses against the phorids exhibited by their hosts. Third, I discuss relevant aspects of the interactions between hosts and parasitoids. Finally, the review ends demonstrating why these phorids could be promising biological control agents of leaf-cutter pests and suggests priority lines of research for the future.

Elizalde, Luciana, Folgarait, Patricia J. (2011): Biological attributes of Argentinian phorid parasitoids (Insecta: Diptera: Phoridae) of leaf-cutting ants, Acromyrmex and Atta. Journal of Natural History 45 (43-44): 2701-2723, DOI: 10.1080/00222933.2011.602478, URL: http://dx.doi.org/10.1080/00222933.2011.602478

The following new species of Apocephalus ant-parasitizing flies are described: Apocephalus exlobicornis Brown & Disney, A. exstriatus Brown & Disney, A. flavitenuipes Brown & Disney, A. intermedius Brown & Disney, A. longisetarum Brown & Disney, A. necdivergens Brown & Disney, A. noetingerorum Brown & Disney, A. penicillatus Brown & Disney, and A. philhispidus Brown & Disney. Host records are reported for each species, as well as new host records for the previously described A. mucronatus Borgmeier, A. neivai Borgmeier, A. setitarsus Brown, A. velutinus Borgmeier, A. viscosae Disney, and for one further unnamed species. Fil: Brown, B. V.. Natural History Museum of Los Angeles County; Estados Unidos Fil: Disney, R. Henry. University of Cambridge; Reino Unido Fil: Elizalde, Luciana. Universidad Nacional de Quilmes; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Folgarait, Patricia Julia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes; Argentina