NEW DIPTEEA OH TWO-WINGED FLIES FROM SOUTH 



AMERICA 



By J. M. Aldrich 

 Associate Curator, Division of Insects, United States National Museum 



The following pajDer contains descriptions of 20 new species and 

 4 new genera of Diptera from South America. The types of all the 

 species, except that of Daetaleus purpureus, are in the United States 

 National Museum. 



As the paper was going through the press it became possible to 

 include as paratypes some material collected in Chile and Argentina 

 by Edwards and Shannon. I hope to take up the bulk of their 

 muscoid collections in a later jjaper. 



Family STRATIOMYIIDAE 



Genus ODONTOMYIA Meigen 



Odontomyia Meigen, lUiger's Mag., vol. 2, 1803, p. 265. 

 ODONTOMYIA TREMOLERANA, new species 



One of the largest species (male 15 mm., female 16 mm.) ; thorax 

 green throughout except for three dorsal black stripes, which in the 

 males join together just before the scutelhim; the central stripe is 

 greatly widened in front. Between the front and middle coxae, 

 along the median line is an oblong area which is reddish yellow. 

 Abdomen green with a dorsal narrow, sharply defined black median 

 stripe on second and third segments, spreading vaguely out over the 

 fourth and fifth ; in the female the abdomen is very broad and there 

 is a distinct trace of a brown stripe on each side halfway between 

 the middle and the margin. Coxae and femora green; tibiae and 

 tarsi reddish. 



Head of male green below and behind, rather strongly carinate 

 below the antennae ; labella large, black ; eyes bare, hardly contiguous, 

 with an area of small facets occupying the lower fourth. First two 

 antennal joints reddish, short, of equal length, third joint broken off. 



The female has small eyes, as usual, the front green with a round- 

 ish black spot covering the ocelli, and a black band from eye to eye 



No. 2746.— Proceedings U. S. National Museum. Vol. 74, Art. 1 



2605—28 1 1 



