88 Journal of Entomology and Zoology' 



brown suffusion; stigma dark brown; an indistinct brown cloud along r-m and the 

 deflection of R-/ + 5; veins dark brown. Venation as in the subgenus, the 2nd Anal 

 vein strongly sinuate. 



Abdomen dark brownish black with a paler brown pollen. Hypopygium a little 

 brighter; pleurites short and stout, sparsely setigerous; two pleural appendages, the 

 outer appendage larger, the outer end flattened and enlarged, along the margin with 

 four parallel rows of fine comb-like points; inner appendage paddle-like, the blade 

 suddenly enlarged, provided with a few setigerous punctures, at the extreme tip with 

 an additional, powerful, curved bristle. Penis-guard straight, tapering gradually to 

 the blunt tip; gonapophyses with the apices produced laterad into conspicuous tri- 

 angular blades with the points directed laterad. 



Habitat. — Oregon. 



Holotype, S, Tillamook, March 26, 1919, (A. C. Burrill). 



Genus Ormosia Rondani. 

 Ormosia subcornuta, sp. n. 



Belongs to the meigrnii group; closely allied to O. cornula (Doane) but the veins 

 stouter, the stigma distinct, and the details of the male hypopygium very different. 



Malf. — Length, about 3.5 — 3.8 mm.; wing, 4.3 — ^.7 mm. 



Female. — Length, about 3.8 — ♦ mm.; wing, 5 mm. 



Rostrum and palpi dark brown. Antennae moderately elongate, dark brovrnish 

 black, the scapal segments slightly paler brown. Head gray, provided with con- 

 spicuous yellow seta;. 



Thoracic dorsum brownish gray without distinct stripes, the lateral margins more 

 yellowish; tuberculate pits shiny black, located close together, the distance between 

 them less than the diameter of one. Pleura brown with a strong gray pruinosity; a 

 large tuft of yellow setsc between the base of the wings and the base of the halteres 

 and a second group immediately ventrad of the halteres. Halteres yellow. Legs 

 with the coxae dark, gray pruinose; trochanters dull brown; remainder of the legs 

 dark brown, the bases of the femora a little brighter. Wings subhyaline; stigma 

 large, dark brown; veins stout, dark brown. Venation: cell 1st M2 open by the 

 atrophy of the outer deflection of Mi; 2nd .Inal vein slightly sinuous on its distal 

 half, converging toward the lit .Inal vein. 



Abdomen dark brown. Male hypopygium with the pleurites stout, provided with 

 numerous conspicuous setigerous tubercles that bear long yellowish seta; which become 

 more elongate and stouter toward the tips of the pleurites; outer pleural appendage 

 subglobular, armed with from 4 to 8 powerful, acute spines, the terminal spine large, 

 along the outer face with microscopic, appressed denticles, the basal spine on the 

 inner side of the appendage largest, strongly incurved; inner pleural appendage 

 long, slender, with a strong spine before the tip to produce a bifid appearance. The 

 most lateral pair of gonapophyses are sinuous, with a group of two or three teeth or 

 spines on the inner face some distance before the tip, the slender apex bevond these 

 slightly curved; the proximal pair of gonapophyses are almost straight, very slender, 

 the lip with numerous indistinct denticles, at the extreme base with a few conspicuous 

 spines; an additional pair of gonapophyses whose apices are conspicuously flattened, 

 with the point of the blade directed laterad and slightly ccphalad. Ninth slernite 



