Pomona College, Claremont, California 87 



Genus Orimarga Osten Sacken. 

 Orimarga wetmorei sp. n. 



General coloration black; thoracic pleura and lateral margin of the praescutum 

 striped with silvery; legs pale yellowish brown, the tips of the feinora a little paler; 

 wings subhyaline, the veins pale brown; tip of Rl 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 antennae paler, the flagellar segments nearly globular. 



The mesonotum has the extreme lateral margins of the praescutum narrowly 

 silvery, the pleura with a broad silvery longitudinal stripe, this type of coloration 

 being similar to that in 0. 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 Rl atrophied or retreated back almost to the tip of Scl ; 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 MS deep; r-m far beyond r. 



Abdomen dark brownish black, the apex broken. 



Habitat. — Florida. 



Holotype, Sex?, Paradise Key, February 22, 1919 (Alex Wetmore). 



Type in the collection of the United States Biological Survey. 



0. luetmorei 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 Rl 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 ram. ; wing, 7.3 mm. 



Rostrum and palpi dark brown. Antenna; 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 prasscutum, 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 

 coxae 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 



