86 AMERICAN DIPTKRA. 



Wings hyaline except the subcostal cell. 



Legs pale yellow, tarsi brownish ; hind femora of male with a comb of about 

 nine strong, blunt, black bristles on the inner or hind side. 



Two males and three females. Aldrich: Moscow, Idaho, June 7th. 



Note. — Our specimens agree with Loew's description in every 

 particular, except that he says that the dorsum of" the thorax is 

 unspotted, while in all of these it is distinctly spotted. 



Leria crassipe.s Loew. 



Loew, Zeitsch. f. Ent. xiii, 68 (Blepharoptera). — Germany. 



Male. — Rather small, dark grayish, the large hypopygium and the legs testa- 

 ceous, the coxffi and the chest between them with very dense pile. Length 5- 

 5.2 mm. ; of wing 5.2-5.3 ram. 



Blackish-gray. Front somewhat narrower than in most of the other species. 

 Occiput and vertex blackish-gray. The anterior of the two fron to-orbital bris- 

 tles rather strong. Antennae reddish-yellow or yellow, tlie third joint sometimes 

 brown on a great part of its outer side ; arista rather short, with pubescence some- 

 what more noticeable than in other species. Eyes large, rounded ; cheeks of only 

 moderate breadth ; vibrissse one on each side, long. Thorax with quite dense 

 and rough hair; an extremely small dot at the base of each hair; between the 

 dorso-central rows of bristles are two faint brownish-black lines, generally much 

 abbreviated in front; on each side are two spots of the same color, still fainter, 

 one before and one behind the suture, the latter one larger. Scutellum concol- 

 orous with thorax. Pleurse more pure cinereous than the dorsum, sometimes 

 somewhat brownish ; only one sternopleural bristle, but the row of hairs in front 

 of it are somewhat strong and bristle-like, so that one or two of them may 

 approach the size of bristles; mesopleura bare; between the middle and hind 

 coxifi with dense and stout bristles. Abdomen blackish cinereous, the hind mar- 

 gins of the segments often brownish-red or almost testaceous. Hypopygium 

 brown-yellowish or more red-yellowish, large and thick, with sparse hair. Legs 

 brownish-yellow, densely hairy ; tarsi infuscated ; femora very strong, the front 

 ones with many bristles; on the underside of all the femora are only the usual 

 hairs, but very dense. Wings with a perceptible tinge, more gray-brown than 

 yellow-brown ; subcostal cell narrow ; bristles of the costa numerous. 



The preceding is a translation of the entire original description. 

 We have two female specimens, sent us under this name from the 

 United States National Museum, from Ungava Bay, Hudson's 

 Bay Territory, Nos. 4116 and 4186, collector L. M. Turner. The 

 description applies very well, only as these are females the pilosity 

 is not so strong as described, especially on and between the coxse ; 

 the row of hairs on the sternopleura, while rather large, do not 

 approach tlie stature of bristles. The specimens having been in 

 alcohol, it is imp()ssil)le to say much about the lines and dots of the 

 thorax. The species was described from Europe, and this is the 

 first published reference to its occurrence in Norlii America. 



