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Camillemyia prominens Gagné, gen. n. et sp. n., (Diptera: Cecidomyiidae; Cecidomyiinae) is described for a gall midge from Mexico with an extremely elongate neck and proboscis. The external and internal basic composition of the proboscis of Cecidomyiidae, as exemplified by Cecidomyia resinicola Osten Sacken, is reviewed to help understand the structural changes found in Cam. prominens as compared to those of Contarinia prolixa Gagné & Byers, another species with spectacularly modified mouthparts.

We describe a new species of the genus Dixella Dyar Shannon of Mexico. Specimens were collected in Lagunas de Santo Domingo, Municipality of Huatusco, Veracruz, a small vegetation-lined lake within an increasingly relictual mountain cloud forest. This species is most closely related to Dixella cumbrica Peters Cook, 1966, based upon the shape of the apical lobe of the gonocoxite and flattened gonostylus. Also, we include the first record of Dixella shannoni (Lane, 1942), in Mexico, based upon specimens collected in Santiago Yaveo, Oaxaca. Additionally, we present a list of all localities in which dixids have been collected in Mexico.

The predaceous midges (Diptera: Ceratopogonidae; tribe Ceratopogonini) in the genera Schizonyxhelea Clastrier Stilobezzia Kieffer in Mexico were recently addressed by Huerta Grogan (2017) who described one new species in each of these genera. A re-examination of specimens in the Colección de Artrópodos con Importancia Medica (CAIM), from the states of Morelos and Yucatan, revealed an undescribed species that was previously identified as Stilobezzia (Stilobezzia) femoralis Lane Forattini from Yucatan by Huerta (2002) and Huerta Grogan (2017). Herein, we describe and illustrate this species from the states of Morelos Yucatan, Mexico, as Stilobezzia (Stilobezzia) tobiasi Huerta Grogan n. sp.

Setostylus xoxo spec. nov., is described and illustrated from Morelos, Mexico and southern Arizona, USA and is compared with similar Neotropical congeners. Additionally, the first records of Setostylus bellulus (Williston) are provided from Guatemala and Costa Rica and an updated key to the New World species of Setostylus is presented.

Two new species of Psectrosciara Kieffer from Mexico-Psectrosciara ahuatla sp. nov. and Psectrosciara otumba sp. nov., both belonging to the scatopsiformis-group, are described and illustrated based on males and females collected in Neotropical (Acapulco and Nuxco in the State of Guerrero) and Nearctic (Coyotepec, in the State of Mexico) areas in Mexico. We have a new record of Psectrosciara serrata Cook from Jalisco (in the Biological Station of Chamela) and females from different parts of Mexico. A key for the species of Psectrosciara from Mexico is presented.

The first record of the genus Micrapemon Edwards from Mexico is presented, with the description and illustration of a new species, Micrapemon maya spec. nov., based on adult males collected with Malaise traps from Yucatan (natural reserves of Ria Celestun and Ria Lagartos). The new species from Mexico is compared with the two previously known species from the Neotropical region, Micrapemon majusculum (Edwards) and Micrapemon parvum (Williston). A key is included to the species of the genus.

Three new species of the genus Olbiogaster Osten Sacken-Olbiogaster halffteri sp. nov., Olbiogaster nuxco sp. nov. and Olbiogaster puuc sp. nov.-are described and illustrated from Mexico, based on adult males and females collected in the states of Guerrero, Puebla and Yucatan. Comments for the species known from Mexico and key are provided.

The first record of the family Bolitophilidae from Mexico is reported from the "Lagunas de Zempoala" Natural Reserve, situated between the borders of the states of Morelos and Mexico (included in the Nearctic Region), with a description and illustration of a new species, Bolitophila (Bolitophila) zempoala spec. nov., based on adults males collected with Malaise traps at an altitude of 2,841 m. a. s. l. in the Neo-Volcanic Axis mountains. The new species from Mexico is very closely related to Bolitophila (Bolitophila) dubiosa Van Duzee, 1928 and B. (B.) dupla Garrett, 1925.

A new species of biting midge, Forcipomyia (Euprojoannisia) bibaana, is described and illustrated from an adult male collected in the state Oaxaca, Mexico. The first records of Forcipomyia (E.) mortuifolii Saunders, F. (Lasiohelea) cornuta Saunders and F. (L.) stylifer (Lutz) are provided from Mexico as well as the first record of F. (L.) anitae Huerta & Ibáñez-Bernal from Guatemala.

Three new species of the ditomyiid genus Calliceratomyia Lane, so far known only from the type-species from southeastern Brazil, are described from Mexico. The new species-Calliceratomyia papaveroi sp. n., Calliceratomyia pantelhomyia sp. n. and Calliceratomyia zayolli sp. n.-are described based on adult males collected with Malaise traps in the States of Oaxaca, Chiapas and Hidalgo, Mexico. The descriptions are illustrated and the diagnosis of the genus is revised.

A new Neotropical species, Neorhegmoclemina yolotli sp. nov., is described and illustrated based on adult specimens collected in the state of Guerrero, Mexico. This species exhibits features not previously recognized for the genus.

The genus Abrhexosa Freeman is reported for the first time from Mexico, with the description of a new species, A. patriciae sp. nov., very close to A. panamensis (Cook, 1956). Two new species of the genus Swammerdamella Enderlein, 1912 from Mexico are described and illustrated: Swammerdamella amorimi sp. nov. and S. amacuzacae sp. nov. Swammerdamella mojingae Cook, 1956 is reported for the first time for Mexico, and new records are included for S. marginata Cook, 1956. A key for the species of Swammerdamella of Mexico is provided.

Five new species of the genus Colobostema Enderlein, 1926 from Mexico are described and illustrated: C. emilianoi (Chiapas), C. marielae (San Luis Potosi), C. valentinae (Jalisco), C. lupitae (Oaxaca) and C. marlettae (Yucatan). A key to the males of Neotropical species of Colobostema is provided. The male genitalia structures (especially the vestiture of parameres and the shape of tergite 9) indicates that all these new species form a group of closely related taxa, associated to the species of the Nearctic and Neotropical region.