336 Annals Entomological Society of America [Vol. XI, 



base, one on each side of the median ventral line (Fig. 18b) ; clasper 

 (Fig. ISa) with one large apical spine and about 3 subapical, subequal 

 spines and one subapical long, slender spine proximal to the others. 

 Coxse dull brown, trochanters fuscous, femora and tibiee dull fulvous, 

 tarsi almost black. Wing (Fig. 49) hyaline ; media and cubitus without 

 setas; base of Rs distad of the mid-point between the tip of Ri and the 

 humeral cross vein; -Ri ends proximad of the forking of media; petiole 

 of cubitus is a little over one-half as long as the base of media; costa 

 produced more than one-half the distance between the tips of Rs and Mi ; 

 Rs is about parallel with costa and ends distad of .85 of the wing length 

 and about opposite the termination of M2. Halteres fuscous. 



Female : Length, 2.2 mm. Same as male except that in one specimen 

 the venter is dull luteous in color. 



Described from 4 males and 4 females collected June 20-27, 

 1907, at Blue Lake, Humboldt Co., Cal., by J. C. Bradley. 

 Type No. 223. Three paratypes and 4 allotypes. 



19. Neosciara ovata n. sp. 



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

 fuscous, at least half the length of the body; palpi fuscous. Thorax 

 fuscous to black, subshining. Abdomen fuscous, intermediate segments 

 dull luteous along the posterior margin. Hypopygium fuscous, no clus- 

 ter of setae at base on median ventral line; clasper (Fig. 19) oval with 

 4 or 5 stout subequal spines near or at the apex. Legs dull fulvous. 

 Wings (Fig. 50) hyaline; media and cubitus without setae; base of Rs 

 distad of the mid-point between the humenis 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 less than half the 

 distance between the tips of Rs and Mi; R^ ends slightly proximad of 

 .85 the length of the wing and distinctly proximad of the tip of M2. 

 Halteres fuscous. 



This species is closely related to spinata, but differs in the 

 structure of the clasper and the shorter petiole of cubitus. 



Described from one male collected at Howser, Selkirk Mts., 

 British Columbia, June 22, 1905, by J. C. Bradley. Type 

 No. 224. 



20. Neosciara trifurca n. sp. 

 Male: Length, 1 mm. Head somewhat shining, black; antennae 

 fuscous, about as long as the body; palpi fuscous. Thorax somewhat 

 shining, fuscous. Abdomen almost black. Hypopygium fuscous with 

 no cluster of setae at base on the mid-ventral line; clasper (Fig. 20) 

 oval, with about 3 subequal, apical stout spines and no subapical 

 spines, several small setae along the inner margin. Legs: coxce, femora 

 and tibiae dull fulvous, trochanters black, tarsi fuscous. _ Wings (Fig. 51) 

 hyaline, media and cubitus without setae; base of Rs distad of the mid- 

 point between humerus and the tip of Ri; Ri ends far proximad of the 



