Pomona College, Claremont, California 87 
Genus Orimarga Osten Sacken. 
Orimarga wetmorei sp. 0. 
General coloration black; thoracic pleura and lateral margin of the prescutum 
striped with silvery; legs pale yellowish brown, the tips of the femora a little paler; 
wings subhyaline, the veins pale brown; tip of RJ atrophied or indistinct; deflection 
of R4+5 very long. 
Sex, female?—wing, about 4 mm. 
The type is badly discolored. The general coloration is a dark brownish black; 
basal segments of the antenne paler, the flagellar segments nearly globular. 
The mesonotum has the extreme lateral margins of the prescutum narrowly 
silvery, the pleura with a broad silvery longitudinal stripe, this type of coloration 
being similar to that in O. argenteopleura. Legs light yellowish brown, the tips of 
the femora indistinctly paler; tarsi darker. Wings subhyaline, the veins pale brown, 
more yellowish along the costal margin. Venation: Sc moderately long, ending at 
about one-third the length of the long sector; Rs strongly arcuated at its origin; tip 
of R1 atrophied or retreated back almost to the tip of Sc; r very long and strongly 
arcuated; basal deflection of R4#+5 very long, strongly arcuated at its origin, more 
than half the length of Rs; cell M3 deep; r-m far beyond r. 
Abdomen dark brownish black, the apex broken. 
Habitat.—F lorida. 
Holotype, Sex?, Paradise Key, February 22, 1919 (Alex Wetmore). 
Type in the collection of the United States Biological Survey. 
O. wetmorei is the sixth American species to be described, the second from the 
United States. The fly differs conspicuously from O. arizonensis Coq. (Arizona) in 
the coloration of the legs and body and in the venation. It is much more like O. 
argenteopleura Alex. (Guatemala) which has the thorax similarly colored; this latter 
species is considerably larger, with dark brown legs and a very distinct venation 
(tip of RI short, persistent; basal deflection of R4+5 short). 
The species is dedicated to the collector, Alex Wetmore. 
Genus Erioptera Meigen. 
Erioptera (Erioptera) oregonensis, sp. n. 
Size large (wing of the male over 7 mm.) ; general coloration brown, including 
the halteres; wings with a strong brownish suffusion. 
Male.—Length, 6 mm.; wing, 7.3 mm. 
Rostrum and palpi dark brown. Antenne dark brown, moderately elongate, 
clothed with a dense white pubescence, the verticils of the more terminal segments very 
long. Head dark brown, more grayish brown around the eyes. 
Mesonotum dark brown with indistinct stripes on the prescutum, the lateral 
margins of which are indistinctly paler; humeral angles not noticeably brightened; 
tuberculate pits small, widely separated; scutum, scutellum and postnotum sparsely 
yellowish gray pruinose. Pleura dark brownish black, gray pruinose. Halteres long 
and slender, dark brown, only the base of the stem a little brightened. Legs with the 
coxe dark, grayish pruinose; remainder of the legs dark brownish black, only the 
trochanters and the bases of the femora a little brighter. Wings with a strong grayish 
