REVISION OF THE NEARCTIC SPECIES OF TRICHOCLINOCERA COLLIN (DIPTERA, EMPIDIDAE, CLINOCERINAE)

There are 16 species of Trichoclinocera Collin recognized from the Nea rctic region, including eight new species. Four of six species-groups of Trichoclinocera are recognized in the Nearctic region, with the fol lowing included species: (1).T. comata group - T. cascadensis sp.nov. (type-locality Starvation Creek, Oregon, U.S.A.), T. comata (Melander) comb.nov., and T. rupestris sp.nov. (type-locality Newton Creek, Wyom ing, U.S.A.); (2) T. dolicheretma group - T. dolicheretma (Melander); (3) T. lapponica group - T. lapponica (Ringdahl) comb.nov.; (4) T. lon gipes group - T. agilis sp.nov. (type-locality Fall Creek Falls, Tenne ssee, U.S.A.), T. ctenistes (Melander), T. dasycoxa sp.nov. (type-loca lity Ottawa, Ontario, Canada), T. falcata sp.nov. (type-locality Gatin eau Park, Quebec, Canada), T. fumosa (Vaillant) comb.nov., T. hamifera (Melander), T. longipes (Walker), T. minor (Melander), T. ozarkensis sp.nov. (type-locality Haw Creek Falls, Arkansas, U.S.A.), and T. pect inifemur sp.nov. (type-locality Phoenixville, Pennsylvania, U.S.A.). T he following new synonyms are proposed: T. brunnipennis (Melander) = T . dolicheretma; and Seguyella saltans (Vaillant) = T. hamifera. Lectot ypes are designated for T. comata, T. ctenistes, T. dolicheretma, T. b runnipennis, T. hamifera, T. lapponica, and T. stackelbergi Collin. Se guvella Vaillant and Acanthoclinocera Saigusa are newly synonymized wi th Trichoclinocera and all species formerly placed in these genera are transferred to Trichoclinocera, except Acanthoclinocera glaucescens ( Brunetti) which is transferred as Wiedemannia glaucescens (Brunetti) c omb.nov. This revision includes a key to Nearctic species, a descripti on of each species, and maps of species distributions. Homologies of m ale terminalia of Clinocerinae are summarized and the first descriptio ns of the immature stages of species of Trichoclinocera also are provi ded. A world list of described species of Trichoclinocera is provided and all species are assigned to one of six species-groups, except T. c ummingi sp.nov. (type-locality Robber's Cave, Oklahoma, U.S.A.), T.flu viatilis (Brunetti) comb.nov., T. fuscipennis Saigusa, and T. maewa Sm ith, which remain unplaced. The monophyly of Trichoclinocera is justif ied and phylogenetic relationships to the remaining Clinocerinae and a mong species-groups are discussed.