FUNGUS GNATS OF NORTH AMERICA. 277 



19. Bolctina iiwps Coquillett. 

 Proc. Washington Acad. Sc. II. 391. 1900. 



Male and female. Length 4.5 mm. Black, the second joint 

 of antennse and base of the third, the palpi, halteres, coxae, 

 femora and male hypopygium yellow, tibise brownish yellow ; 

 hairs of body yellow ; thorax subopaqtte, thickly gray pruinose ; 

 abdomen subopaque ; bristles of inner side of middle tibiae 

 slightly shorter than the diameter of each tibia ; wings hyaline, 

 tip of the subcosta slightly before the base of the radial sector, 

 subcostal crossvein wanting; media forking slightly beyond, the 

 cubitus about opposite to base of radial sector; third joint of 

 antennae twice as long as wide ; hypopygium of male at least 

 1-2 longer than the longest segment of the abdomen preceding 

 it. "Yakutat and Orca, Alaska." 



Var. a. A single female specimen from Moores Lake, Idaho, 

 differs in having brownish hind coxae and abdominal segments 

 except the first with yellow posterior margins. Wing venation 

 as figured (Fig. 190). The leg measurements given on page 

 324 are of this specimen. 



20. Bolctina scdula n. sp. 



Male and female. Length 3.5 mm. Head black, gray polli- 

 nose, antennae dark, 3 basal joints yellow, intermediate joints 

 over twice as long as wide, palpi yellowish. Thorax and abdo- 

 men black, gray pollinose, the abdomen subshining, hairs yel- 

 low. Hypopygium black, resembling that of B. gracilis. Coxae 

 and legs yellow, tarsi infuscated, spurs black; claws unmodified, 

 each with strong tooth near the base. Wings 4 mm. long 3.6 

 times as long as the fore tibia ; hyaline, veins yellowish brown ; 

 venation as figured (Fig. 191). Halteres yellow. Longmire's 

 Springs, Mt. Rainier, Wash., August fJ.M.A.). In the female 

 the fork of the cubitus is a little proximad of fork of the media. 



21. Boletina nacta n. sp. 



Male and female. Length 3.5 mm; wings 4 mm. Head and 

 its parts black, intermediate antennal joints about 3 times as 

 long as wide. Thorax and abdomen black subopaque, hairs 

 yellow; hypopygium black, similar to that of B. graciJ's but 

 forceps differ. (Fig. 155). Coxae and legs yellow, the bases 

 of hind coxae and the trochanters black; tarsi infuscated; spurs 



