TjUXGUS gnats of XORTH AMERICA. 83 



a single seta on flexor surface. Wing hyaline, central spot and 

 diffuse preapical cloud pale brown (Fig. 190). Halteres yellow. 

 Ithaca, N. Y. (Aug.). 



Female. A female from the same locality with dark brown 

 thorax, yellow humeri, brown abdomen with yellow venter and 

 yellow margins on the tergites, may belong here. 



7. Mycofhcra fencstrata Coquillett. 



Inv. Pacifica, I. 19. 1905 (Alycetophila). 

 ^Nlale. Length 3 mm. Head, antennae, thorax and abdome' 

 dark brown, scape, palpi, humeri and hypopygium (Fig. 66^ 

 dusky yellow. Coxae and legs yellow, the tarsi, tips of coxae, 

 of middle and hind tibiae and of hind femora brownish, middle 

 tibiae each with one seta on the flexor surface. Wings hyaline 

 with a brown spot over the crosvein, apical third of wing smoky 

 less distinct posteriorly, a clear spot behind Rs below tip of Ri 

 (Fig. 191). Halteres yellow. Buffalo, N. Y. ; Moscow, Id. 

 iJM.A.) ; "Stanford Univ., Cal." 



7a. Mycothera fencstrata, var. praenubila n. var. 



^lale. Only the anterior part of the preapical wing cloud. 

 is distinct, the wing marks appearing as in ilf. 7'ecta. 



Female. Thorax more reddish brown, with dark vittae feebly 

 indicated. Friday Harbor, Wash. (J.M.A.) ; Price Co., Wis. 

 (W'.M.W.); Alabama; Ithaca, N. Y., Forest Hill, N. J.' 

 (Weidt), April. 



8. Mycothera impellaiis n. sp. 



^lale. Length 2.5-3 t^^t^- Head and antennae dark brown, 

 the scape and palpi yellow. Thorax brownish ; the mesonotum, 

 scutellum and metanotum fuscous, setae brown. Abdomen 

 brownish, each tergite darker posteriorly, but the extreme mar- 

 gin and the venter pale; hypopygium yellow (Fig. 6y). Coxae 

 and legs yellow, tarsi and tips of hind femora, brown ; middle 

 tibia with 2 or 3 setae on flexor surface. Wings hyaline, a 

 brown central spot, and a brown sharply defined preapica. 

 spot, a spur of which is produced into the tip of cell Ri; apical 

 margin of wing very faintly smoky (Fig. 192). Halteres yel- 

 low. 



Female similar, but abdomen more uniformly brown. Alt. 

 Ranier. Longmire's Spring, Wash., TJ.M.A.) Jwlv, Aug.; 



