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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).