338 Annals Entomological Society of America [Vol. XI, 



23. Neosciara penna n. sp. 



Male: Length, 1.1 mm. Head black, somewhat shiny; antennae 

 fuscous, over half the length of the body ; palpi luteous. Thorax some- 

 what shining, almost black. Abdomen dark fuscous with posterior 

 margin of the intermediate segments dull luteous. Hypopygium fus- 

 cous, with no cluster of setse on the mid-ventral line at the base; clasper 

 (Fig. 23) narrowly oval, with one apical stout spine and no subapical 

 spines. Legs; coxse and femora luteous, trochanters black, tibiae and 

 tarsi fuscous. Wings (Fig. 54) hyaline; media and cubitus without 

 setae; base of Rg distad of the mid-point between the humerus and the 

 tip of Ri; Ri ends considerably proximad of the forking of M; petiole 

 of cubitus shorter than half the length of the base of M ; costa extends 

 more than half the distance between the tips of Rs and Mi; Rg ends 

 slightly proximad of .85 the length of the wing and considerably prox- 

 imad of M2. Halteres, knob fuscous, pedicel luteous. 



This species is near acuta in the key but differs from the 

 latter by having no subapical spines on the clasper and by 

 having Kg end proximad of the tip of Mo. Type No. 228. 



Described from one male, collected at Blue Lake, Humboldt 

 Co., Cal., June 20-27, by J. C. Bradley. 



24. Neosciara pollicis n. sp. 



Male: Length, 1.4 mm. Head somewhat shiny, black; antennae 

 fuscous, about half the length of the body; palpi fuscous. Thorax 

 somewhat shining, fuscous. Abdomen almost black. Hypopygium 

 fuscous, with no cluster of setae on the mid-ventral line at base; clasper 

 (Fig. 24) longer than wide, with no stout spines, but with a subapical 

 long seta. Legs: coxae and femora fulvous, trochanters black; tibiae 

 and tarsi dull brown. Wings (Fig. 55) brownish; cubitus and media 

 without setae; base of Rg distad of the mid-point between the humerus 

 and the tip of Ri; Ri ends proximad of the forking of M; petiole of 

 cubitus almost as long as the base of media; costa extends a little over 

 half the distance between the tips of Rs and Mi. Rs ends proximad of 

 ,85 the length of the wing and noticeably proximad of the tip of M2. 

 Halteres dark fuscous. 



This species is near sativcE and may be distinguished from 

 the latter especially by having a wider wing and by the clasper 

 lacking spines. 



Described from one male collected in Arizona, August. 

 Type No. 229. 



25. Neosciara hamata n. sp. 



Male: Length, 1.2 mm. Head shining, black; antennas fuscous; 

 palpi fuscous. Thorax shiny, almost black. Abdomen almost black. 

 Hypopygium almost black, with no cluster of setee on the mid-ventral 



