FUNGUS GNATS OF NORTH AMERICA. 259 



femora, particularly the hind pair, compressed, all tibiae with 

 weak lateral setae. The fore tibiae have one range, the middle 

 tibiae 3, and the hind tibiae 2 ranges of setae, those on the inner 

 side very minute. Wing oval; the costa extends far beyond 

 the tip of the radial sector, ending before the tip of the wing; 

 subcosta long; subcostal crossvein (Scs) present; the short basal 

 cell ends proximad of the fork of the media ; cubitus not 

 branched; anal vein vestigial. (Figs. 171, 172). 



Table of species. 



a. Wings with brown erossband extending from apex of Ri across the 

 wing; a spot below the cubitus near apex. Length 5mni. Calif. 



I. varipennis. 

 aa. Wings without bands. 



b. Black, coxae and legs yellow; costa produced 1-3 of distance to 



Mi; Md., N. Y., Wash. 2. psyllfi. 



bb. Yellow, abdomen fasciate ; costa produced less than 1-4 distance 



to Ml. N. J., N. Y., Mass. 3. flaveola. 



I. Acnemia varipennis Coquillett. 

 Proc. Wash. Ent. Soc. VI. 169. 1904. 

 Female. Length 5mm. Yellow ; the antennae beyond the 

 second joint, a circle around each ocellus, a spot in front of 

 each wing, the breast largely, a streak at the extreme apex, 2 

 longitudinal vittae on lower half of metanotum, a spot in front 

 of the halteres, the abdomen except bases of segments and the 

 genitalia, the tarsi except their bases, and the knob of the 

 halteres, black; a pair of widely separated brownish subdorsal 

 vittse on the mesonotum; hairs and bristles chiefly yellow. 

 Wings grayish hyaline, tinged with yellow along the costa, base 

 of radial sector clouded with brown, a brown erossband extends 

 from apex of cell Ri to apex of cell M2, becoming grayish 

 posteriorly, a' large brown spot along under side of cubitus 

 before its apex. "Mountains near Claremont, Calif." 



2. Acnemia psylla Loew. 

 Berlin. Ent. Zeitschr. XIII. 148. 1869. 

 Male. Length 2.5 mm. Black, shining, pile yellowish. Head 

 black; antennae dusky, pale toward the base. Hypopygium 

 rather prominent, blackish (Fig. 141). Coxae and legs yel- 

 lowish, trochanters each with a black spot, tibial spurs yellow; 



