80 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



as long as wide, pointed at tip; arista short, about two-fifths as 

 long as third antennal joint and inserted just above its tip. Inferior 

 orbital cilia whitish, the upper ciUa black. 



Thorax green, dorsum dulled with whitish pollen, which leaves 

 obscure vittae that are shining, the median one is somewhat copporv' ; 

 pleurae more black, dulled with gra}^ poUen. Abdomen green with 

 black incisures, covered with white pollen, which is thickest on the 

 sides and in certain hghts leaves a central black vitta. Hypopygium 

 black; its lamellae (fig. 40a) moderately large, somewhat orbicular 

 in outline, ^vhitish with a narrow black border on apical and upper 

 margins, jagged and bristly on lower corner, fringed with long deli- 

 cate hairs on apical and upper edges. 



Coxae and femora black, tips of fore and middle coxae, trochanters 

 and tips of femora yellow. Middle and hind femora each with one 

 preapical bristle, the latter not ciliated, still they have a row of 

 long pale hairs on lower inner edge, which are verj- delicate and not 

 easily seen, they are about one-fourth to one-third as long as the 

 width of the femora. Tibiae yellow; posterior pair black at tip for 

 one-sixth their length and with a blackish spot on inner surface at 

 basal third, only a little thickened, the glabrous stripe on upper sur- 

 face is broad and extends nearly their entire length. Fore and mid- 

 dle tarsi a little longer than their tibiae, black from the tip of the 

 first joint. Hind tarsi wholly black. Calypters, their cilia, and the 

 halteres yellow. 



Wings a little grayish; costa with a small knot-like enlargement 

 at tip of first vein; last section of fourth vein a little bent just before 

 its middle, from which point it is nearly parallel with third vein; 

 hind margin of wing not indented at tip of fifth vein; anal angle 

 prominent. 



Female. — Face wider than in the male; third antennal joint large, 

 long for a female, somewhat triangular in outline, acutely pointed 

 at tip, arista nearly apical; thorax dulled with whitish pollen as in 

 the male; wings without an enlargement at tip of first vein, other- 

 wise as in the male. Middle tibiae with one bristle below, their 

 basitarsi without a bristle above. 



Described from 1 male and 1 female which were swept from \\ inter 

 wheat at EvansviUe, Indiana, Mav 7, 1914, bv J. M. Aldrich. 



Type.— Msile, Cat. No. 22998, U.S.N M. 



This species somewhat resembles intentus Melander and Brues, but 

 it difl'ers in having only one preapical bristle on the middle and hind 

 femora, in having the front greenish, dulled with gray pollen, not 

 metallic violet as in iiitentvs: it also differs in the form ot the 

 lamellae. 



