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We report 28 species of ticks (Acari: Ixodida) from Colorado (CO). We include the soft ticks (Argasidae) Argas(Argas) cooleyiKohls and Hoogstraal, Argas(Persicargas) radiatusRailliet, Carios(Alectorobius) concanensis(Cooley and Kohls), Carios(Alectorobius) kelleyi(Cooley and Kohls), Ornithodoros(Pavlovskyella) hermsiWheeler et al., Ornithodoros(Pavlovskyella) parkeriCooley, Ornithodoros(Pavlovskyella) turicata(Dugès), Otobius(Otobius) lagophilusCooley and Kohls, and Otobius(Otobius) megnini(Dugès). We include the metastriate hard ticks (Ixodidae) Dermacentor(Americentor) albipictus(Packard), Dermacentor(Dermacentor) andersoniStiles, Dermacentor(Dermacentor) parumapertusNeumann, Dermacentor(Dermacentor) variabilis(Say), Haemaphysalis(Aboimisalis) chordeilis(Packard), Haemaphysalis(Gonixodes) leporispalustris(Packard), and Rhipicephalus(Rhipicephalus) sanguineusLatreille. Prostriate hard ticks include Ixodes(Ixodiopsis) angustusNeumann, Ixodes(Phoeloioxdes) baergiCooley and Kohls, Ixodes(Trichotoixodes) brunneusKoch, Ixodes(Scaphixodes) howelliCooley and Kohls, Ixodes(Phoeloioxdes) kingiBishopp, Ixodes(Phoeloioxdes) marmotaeCooley and Kohls, Ixodes(Ixodiopsis) ochotonaeGregson, Ixodes(Phoeloioxdes) sculptusNeumann, Ixodes(Ixodiopsis) soricisGregson, Ixodes(Ixodes) spinipalpisHadwen and Nuttall, Ixodes(Phoeloioxdes) texanusBanks, and Ixodes(Ixodiopsis) woodiBishopp. Argas radiatusand Ixodes brunneusrepresent new state records. Review of collection reports revealed that inclusion of Ixodes(Multidentatus) auritulus(Neumann), Ixodes(Phoeloioxdes) cookeiPackard, Ixodes(Phoeloioxdes) marxiBanks, and Ixodes(Ixodes) pacificusCooley and Kohls is dubious or unconfirmed and, conversely, that C. concanensisand H. chordeilishave distributions that include CO. We list an additional five species occasionally detected and 13 exotic species intercepted in CO. Tick-host associations, geographical distributions, and medical/veterinary importance are included.

Phoretic deutonymphs (hypopi) of Schwiebea sp. mites were detected during examinations of questing adult and nymphal blacklegged ticks, Ixodes scapularis Say, from vegetation at two woodland sites in northeastern Wisconsin, USA, during May and June, 2014. Collection sites were in Marinette and Oconto Counties, respectively. These hypopi are evidently the first reported from ticks in the Western Hemisphere, and they seem to be most similar morphologically to the putatively Holarctic species Schwiebea nova (Oudemans).

Results of a survey for ixodid ticks and/or serum antibodies to Borrelia burgdorferi from 14 species of small to large mammals from eastern coastal areas of the United States are presented. Most samples were obtained from July 1987 through June 1989 (excluding December–March) at 3 locales: Assateague Is. National Seashore, Worcester Co., MD., and Accomack Co., VA. (≈38° 05' N 75° 10' W), and Cape Hatteras National Seashore, Dare Co., NC (≈35° 30' N 76° 35' W). Hosts sampled included opossums (Didelphis virginiana), least shrews (Cryptotis parva), gray foxes (Urocyon cinereoargenteus), red foxes (Vulpes vulpes), raccoons (Procyon lotor), feral cats (Felis sylvestris), feral horses (Equus caballus), sika deer (Cervus nippon), rice rats (Oryzomys palustris), white-footed mice (Peromyscus leucopus), meadow voles (Microtus pennsylvanicus), house mice (Mus musculus), norway rats (Rattus norvegicus) and jumping mice (Zapus hudsonius). An indirect fluorescent antibody test was used for testing sera from opossums, raccoons, and feral cats; enzyme-linked immunosorbent assays were used for sera from foxes, horses, deer, and house and white-footed mice. Antibodies to B. burgdorferi were found in all species tested from each locale. Seasonal data reinforce the contention that P. leucopus is a suitable sentinel species for B. burgdorferi. Ticks on hosts included Ixodes scapularis Say, I. texanus Banks, Dermacentor variabilis (Say), D. albipictus (Packard), and Amblyomma americanum (L.). Males comprised ≈0–22 and 60–81% of Ixodes sp. and Amblyomma-Dermacentor adults collected from hosts, respectively. All stages of A. americanum, adult D. variabilis, and larval I. scapularis were collected from vegetation. The highest seropositivity rate (67%) was recorded for 45 P. leucopus at Assateague during July, ≈1 mo. after peak nymphal I. scapularis intensity. Borrelia burgdorferi was isolated from 6 nymphal and 12 female I. scapularis collected from P. leucopus and C. nippon, respectively, on Assateague.