PROC. ENTOMOL. SOC. WASH. 100(4). 1998, pp. 792-823 REVIEW OF THE GENUS HEMERODROMIA MEIGEN (DIPTERA: EMPIDIDAE; HEMERODROMIINAE) OF AMERICA NORTH OF MEXICO John F. MacDonald Department of Entomology, Purdue University, W. Lafayette, IN 47907-1158, U.S.A. (e-mail: [email protected]). Abstract. — The genus Hemerodromio is reviewed for America north of Mexico. A general diagnosis and a modified description are presented for the genus and each of the 13 previously described species. Nine new species are described from America north of Mexico: Hemerodromia burdicki, H. chelata, H. flexiformis, H. glabella, H. ligata, H. loba, H. reclinata, H. sinclairi, and H. siibchelata. Designation of neotypes are made for Hemerodromia empiformis (Say) and H. superstitiosa Say. Designation of lectotypes are made for the following: H. captiis Coquillett; H. coleophora Melander; H. luinispe.x Melander; H. jugiilator Melander: H. melanosomu Melander; H. steUaris Melander; H. vates Melander; and, H. vittata Loew. Hemerodromia haruspex Melander 1947 is shown to be a new synonym of H. melauosoma Melander 1947, H. rogatoris Coquillett 1895 a new synonym of H. superstitiosa Say 1824, and H. vittata Loew 1862 a new synonym of H. superstitiosa Say 1824. Previously known only from the Palearctic Region, H. oratoria (Fallen) was found to be widely distributed in North America. Separate keys to male and female adults, illustrations of male terminalia, and known distributions are pro-vided. Key Words. Diptera, Empididae, Hemerodromiinae, Hemerodromia, dance flies Adult flies of the genus Hemerodromia Larvae and pupae of //f »;eroc?;Y>»»'rt spe-Meigen (Empididae, Hemerodromiinae), cies are aquatic (Smith 1969), and larvae like those of other genera in the subfamily, are reported to prey on black fly larvae (Pe-are very small (ca. 2-4 mm), elongate, and terson 1960). Labels accompanying adults possess raptorial forelegs. Their wings lack of Nearctic Hemerodromia suggest that an anal lobe. Nearctic genera of Hemerod-they commonly are swept from riparian romiinae have been reviewed by Melander vegetation and also taken in Malaise traps. (1902, 1928, 1947). MacDonald (1988, Harper ( 1980) collected males and females 1989, 1993, 1994), and MacDonald and of several speces in emergence traps placed r^ ,«^-.. c ■ .-■ , over streams m Quebec, Canada. Turner (1993). Species httmg the present „. . . j • i-■. j . u *^ JT t--pj^g present study is limited to Hemer-concept of Hemerodromm are found in ^^^^,,^^ .^^ ^^^^.^^^ ^^ America north of Mex-North America (Melander 1947), Europe ^^^ included are a general diagnosis and a (Chvala and Wagner 1989), China (Yang modified description for the genus and each and Yang 1990), India and Indonesia (Me-of the 13 previously described species, de-lander 1928), Nepal (Smith 1965), South scriptions of nine new species, separate Africa (Smith 1969), and South America keys to male and female adults, and known (ColUn 1933, Smith 1967). distributions.