282 MAINE AGRICULTURAL EXPERIMENT STATION. I9II. 



Female. Differs in having black pile on thorax and abdomen ; 

 yellow fascise of ventral abdominal sclerites less extended, and 

 tibiae more brownish. Midvale, Montana (C. E. Brown). 



Var. a. Female. Length 3.5 mm. Hairs of thorax and 

 abdomen yellowish. Wing fascia is produced proximad in 

 cell Ml nearly reaching the fork. Little Wind River, Wyo., 

 (W.M.W.), Sept. Represented by but a single specimen. It 

 ma}^ be a distinct species. 



5. Leia nitens Williston. 

 Trans. Ent. Soc. London. 259. 1896. 

 Male and female. Length 4 mm. Mesonotum shining black; 

 wings infuscated. Front black or blackish, yellowish on the 

 lower part ; face yellow ; antenna blackish, the basal joints 3^el- 

 lowish, about as long as the thorax. Mesonotum, scutellum, 

 and metanotum shining black, the bristles of the same color; 

 pleura yellow in front; reddish-brown behind. Abdomen slen- 

 der; shining black or deep brown, the proximal segments in 

 front yellow or yellowish; venter yellow. Tuberculum of hal- 

 teres black. Coxae yellow; femora nearly the same color; hind 

 femora at the tip blackish ; tibiae brownish yellow ; tarsi brown ; 

 front tibiae shorter than the metatarsi ; middle tarsi nearly a 

 half longer than their tibiae ; hind tibi^ and tarsi of nearly equal 

 length. Wings infuscated, the apex tinged with blackish ; a 

 brown spot at the origin of the crossvein. Middle and hind 

 tibije with stout spurs. In some specimens the face is brown, 

 the front wholly black, the posterior part of the pleura and 

 greater part of abdomen, black. "St. Vincent Isl." 



6. Leia ventralis Say. 

 Long's Exped. to St. Peter's River. App. 364. 

 Male and female. Length 3.5 mm. Head black; antennae 

 brown, 3 basal joints and the palpi 3^ellow. Thorax and abdo- 

 men shining black, venter with segments 3 and 4 largely yel- 

 low ; hairs pale. Coxse, femora, tibiae, and metatarsi yellow ; 

 remainder of tarsi brown ; tip of each hind femur blackish ; 

 tibial spurs yellow. Wings whitish hyaline, the broad pre- 

 apical band nearly reaches the base of the fork of the media. 

 (Fig. 196). Halteres yellow with black knob. "North West 



