164 DIPTERA OF NORTH AMERICA. [PART II. 



black ; eyes of the male separated upon tlie front. Long. corp. 0.14 

 0.15. Long. al. 0.15. 



STN. Diaphorus sodalis LOEW, Neue Beitr. VIII, 58, 4. 



Rather dark metallic-green, the abdomen and sometimes also 

 the thorax more bronze-green, the scutellum in one specimen violet 

 upon its middle. Face of the male of uniform breadth, green-blue 

 with thick white dust ; the face of the female visibly broader, 

 more green, with less dust, below the middle with a transverse 

 swelling. Palpi of the male whitish, only near the extreme basis 

 somewhat blackish ; the palpi of the female much larger, only at 

 the tip dusky-whitish, otherwise blackish. Antennas small, black, 

 with an apical arista. Front of the male of uniform breadth, 

 somewhat exceeding the breadth of the face, blue with yellow- 

 brownish dust, and green and shining upon the vertex. The front 

 of the female is considerably broader, more green and less thickly 

 dusted, the dust has in the vicinity of the antennae a whitish 

 appearance. Cilia of the upper orbit black, those of the lateral 

 and inferior orbits whitish. Thorax distinctly, but not very thickly, 

 dusted. The coarser bristles on the posterior end of the small 

 hypopygium are less striking ; the very small exterior appendages 

 are brownish-black. Coxa3 black with whitish dust ; the fore coxae 

 indistinctly dingy white-yellowish at the tip ; the sparse hair on 

 the front side pale, but the bristles black at the tip. The tro- 

 chanter of the fore and middle feet dusky-yellowish, of the hind 

 feet more brownish. Femora black with green lustre ; their black 

 hair is comparatively short ; only on the under side of the femora 

 of the male, very closely to the tip, a few somewhat longer bristle- 

 like hairs. The tips of the four anterior feihora and the tibias are 

 brownish-yellow, but the tip of the hind tibiae is rather dark- 

 brown. The fore tarsi of the male are slender and elongated, 

 brownish-yellow at the root, then gradually becoming more infus- 

 cated ; their first joint is about as long as the two following taken 

 together ; the pulvilli are but moderately enlarged and elongated. 

 The middle tarsi of the male are of the same color as the fore 

 tarsi and of the same structure, but the first joint is almost as 

 long as the following four taken together, and the pulvilli are not 

 so much enlarged and less elongated. The fore and middle tarsi 

 of the female correspond in color with those of the male, are, how- 

 ever, considerably shorter, have no enlarged pulvilli, and the first 



