ART. 9 FLIES OF THE GENUS STYLOGASTER ALDRICH 19 



Type in American Museum of Natural History. 

 Paratyj)e.—M2i\Q, Cat. No. 43027, U.S.N.M. 



STYLOGASTER BREVIVENTRIS, new species 



Male. — Frontal triangle of medium size, brownish, shining, the 

 sharp apex slightly exceeding middle of front; front black above, 

 becoming yellow on the lower third or fourth; first antennal joint 

 whitish, second whitish at base, remainder yellow ; third joint yellow 

 with infuscated upper edge, of the same length as the second; pro- 

 boscis yellow to the middle of the first joint. Mesonotum shining 

 brownish black, the humeri white and the same color extending back 

 to the suture and mesially for a little distance; pleural stripe much 

 paler than usual, indistinct except above, the posterior opaque brown 

 area of the mesonotum rather large. Scutellum brown, metanotum 

 blackish in middle ; humeral 1 ; notopleural 2 ; supraalar 1. 



Abdomen considerably wider and shorter than usual. First seg- 

 ment mostly yellow, only a brownish shade extending across near 

 the hind edge and a small dark spot in middle, the lateral bristles 

 black, numerous, and arising from a pale spot; the second segment 

 more widened at apex, pale at base, then brown, a darker brown 

 line bordered with a row of large hairs extending across at about 

 three-fourths the length, the remainder bare and slightly paler; 

 lateral bristles black, few, and large; third segment shorter and a 

 little wider than second, with a brown somewhat arcuate band across 

 the middle, bordered b}^ a row of large hairs, the space behind this 

 being bare; this arcuate band approaches the hind margin at the 

 sides ; fourth segment as wide as the third but a little shorter, mostly 

 dark brown, having like the preceding two segments, a noticeable 

 bare area behind; fifth segment fully as long as the two preceding 

 segments taken together, brown except along the sides; it has at 

 the posterior edge a peculiar somewhat globose area in the middle 

 which widens forward in the form of two ridges extending toward 

 the sides and including at the front edge almost the whole width 

 of the segment; sixth segment short, blackish; seventh segment also 

 blackish. Viewed from the side, the shining brown fifth segment is 

 large and conspicuous and is longer than the two preceding. 



Front and middle legs pale yellow; front coxae with only a few 

 small dark hairs at tip; hind femora brown with a broad pale 

 annulus in the middle, very few villous hairs on the inner side near 

 base; hind tibiae yellow on basal half, slightly brownish beyond, 

 wnth faint indications of a pale annulus before tip; flexor side with 

 minute, erect hairs beyond middle; hind tarsi brown, blackish at 

 tip. Hind trochanters without usual pile. 



