180 [Augusr, 



74 (75). Inner bristle of lower frontal row clone to the eye margin and in vertical 



line with the outer one ; upper supra-antennal bristles vert/ tuide 

 apart. The black thorax is tinged with red in all the specimens 

 I have seen ] ^ mm. infraposifa. 



75 (74). Frontal bristles in usual position and supra-antennal ones approximated. 



76 (77). Costa and fringe both r^ery long, the former extremelt/ so — about | toing 



length. Tibial cilia minnte and ninnerous. . . . 1 mm. longicostalis. 



77 (76). Costa well short of ^ the wing length. 



78 (81). Male abdomen clothed on the sides with numerous blunt-ended and I'ery 



long hairs. 



79 (80). Supra-antennal bristles small, the under ones minute. Male hind tibise 



of curious shape, the upper ridge-like edge being flattened out on its 

 loioer third or rather more f mm. hirtiventris. 



80 (79A Four large and nearly equal .sup^a-antennal bristles. Hind tibise .simple 



and bare 2^-3 mm. rufipes, Mg. 



81 (78). Male abdomen not so clothed. 



82 (83). Male hind tibiae shaped as in hirtirentris. 



Supra-antennal bristles small, under ones min^^te. First costal 

 division from two to three times as long as the second, the proportion 

 greatest in male. Male costa sometimes not fully to wing middle. 



...li-lj mm. deraia. 



83 (82). Hind tibial simple. 



84 (87). Supra-antennal bristles large and nearly equal, at least in the male. 



85 (86). Legs dark brown, almost black ; tibial cilia distinct and of bristly 



character. Costa of male barely to wing middle. 



...lf-2:f mm. vernal is. 



86 (85). Legs yellowish ; hind tihise bare or minutely ciliated. Costa well to 



middle of wing in both sexes lf-2 mm. pulicaria, Fal. 



87 (84). Supra-antennal bristles small, under ones minute. 



88 (89). Upper edge (seam) of hind tibix blunt and straight, without cilia on its 



inner side, but in the male with numerous small erect or semi-erect 

 hairs on the outer side. Hypopygium long and cylindrical, as large 

 ■in all its dimensions as the Qth segment or even larger ; anal organ 

 minute 1t~12 mm. nudiventris. 



89 (88). Edge of hind tibix sharp and its loioer third deflected outwards; cilia 



distinct but not strong. Hypopygium and anal organ ordinary, both 

 in form and size {.see Mr. Collin's dratoings, Fol. xx, p. 148). 



90 (91) . Thorax and antennas yellow ] i mm. lutea, Mg. 



91 (90). Thorax black or dusky red. Antenna? red or brown. 



...IJ-lf mm. scufellaris. 



92 (63). Costa conspicuously short of wing middle. 



93 (100) Halteres black or (halterata) brown. 



94 (95). Tibial cilia sparse and strong. 



First costal division more than double the other two. Hypopy- 

 gium small and without bristles 2 mm. maura. 



95 (94). Cilia weak and numerous, or (erecta) tibiae quite bare. 



