DESCRIPTION OF THE SPECIES. 33 



much smaller, but that the incisures of its abdomen are less 

 blackened, that the black coloring on the. tip of its hind tibia? is 

 less extended and more sharply limited, and that finally the short 

 hairs upon the under side of its fore and middle femora have, in 

 a reflected light, for the most part a whitish appearance, whilst in 

 the female of D. albiciliatus this is the case only in the proximity 

 of the base of the fore femora. 



6. D. tetricilSj n. sp. ^ and 9 . Obscure viridis, rarius cupreus, 

 antennis pedibusque nigris, apicali femorum triente testaceo, inferioribus 

 oculorum ciliis flavicantibus, alis ciuereis. . Facie exochraceo-cine- 

 rea, lamellis hypopygii albidis, ultimo tarsorum anticorum articulo 

 dilatato, tibiis posticis crassiusculis. 9 Facie albida, pedibus simpli- 

 cibus. 



Dark green, seldom coppery ; antennae and feet black, the last third of the 

 femora brownish-yellow ; cilia of the inferior orbit yellowish ; wings 

 grayish. . Face yellowish-gray ; lamellae of the hypopygium whitish ; 

 the last joint of the fore tarsi enlarged : hind tibiae somewhat thickened. 

 9- Face white; feet plain. Long. corp. 0.18 0.20. Long. al. 0.20 

 0.22. 



Dark green, bright; the last segments of the abdomen are 

 usually dark bronze-colored, and sometimes the color of the body 

 is everywhere very coppery. Antennae black ; the third joint 

 almost round, still with a sharp projection at the tip. Front me- 

 tallic green. The face of the male not very narrow, yellowish gray ; 

 the face of the female much broader, whitish. Palpi black, dusted 

 with whitish on the edge, particularly in the female. Cilia of the 

 inferior orbit- yellowish, sometimes nearly whitish. Hypopygium 

 with elliptic, whitish lamella? of moderate size, which are bordered 

 with black on the upper and apical margin ; the latter is somewhat 

 jagged. Coxse black ; fore coxa? with black hairs and bristles, only 

 very slightly dusted with white. Feet black; the last third of the 

 fore and middle femora, as also somewhat more than the last quar- 

 ter of the hind femora, reddish luteoua-yellow or almost yellowish- 

 red ; the hind femora before the tip with *a seta, not ciliated upon 

 their under side, even in the g . The tibia? show only at the very 

 extreme base a lighter color ; in the 9 all tibia? are of a plain 

 structure, in the J* the hind tibia? are conspicuously thickened. 

 The 9 has plain tarsi, in the male the last joint of the fore tarsi 

 is flattened from the side, and enlarged above into a lobe ; the 

 first joint of the hind tarsi in both sexes is but little fringed with 

 3 



