88 Journal of Entomology and Zoology 
brown suffusion; stigma dark brown; an indistinct brown cloud along r-m and the 
deflection of R4+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, ¢, Tillamook, March 26, 1919, (A. C. Burrill). 
Genus Ormosia Rondani. 
Ormosia subcornuta, sp. n. 
Belongs to the meigenii group; closely allied to O. cornuta (Doane) but the veins 
stouter, the stigma distinct, and the details of the male hypopygium very different. 
Male.—tLength, about 3.5—3.8 mm.; wing, 4+.3—4.7 mm. 
Female.—tLength, about 3.3—4 mm.; wing, 5 mm. 
Rostrum and palpi dark brown. Antenne moderately elongate, dark brownish 
black, the scapal segments slightly paler brown. Head gray, provided with con- 
spicuous yellow sete. 
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 sete 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 coxe 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 7st M2 open by the 
atrophy of the outer deflection of M3; 2nd Anal vein slightly sinuous on its distal 
half, converging toward the /st Anal vein. 
Abdomen dark brown. Male hypopygium with the pleurites stout, provided with 
numerous conspicuous setigerous tubercles that bear long yellowish sete 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 beyond these 
slightly curved; the proximal pair of gonapophyses are almost straight, very slender, 
the tip 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 cephalad. Ninth sternite 
