220 WHEELER. 



tinctly showing through the dust. Antennae black, third joint 

 narrower than in D. frninosa, ventral projection short, trun- 

 cated ; arista somewhat longer than that of the preceding species. 

 Cilia of the superior orbit more, those of the inferior orbit less, 

 conspicuous. Thoracic dorsum with two approximated median 

 dark lines, and accumulations of white dust in the humeral and 

 prealar depressions. Abdomen tapering to the hypopygium, 

 which is distinctly smaller and more imbedded than in the 

 preceding species. Of the appendages only the small lamellae, 

 beset with yellow hairs, are visible. The rounded base of the 

 hypopygium lacks the black hairs which cover the abdominal 

 segments. The dark metallic green color of the pleurae and 

 coxae is overlaid with a thick and uniform layer of pale dust. 

 There are a few stout yellow bristles above the insertions of 

 the fore coxae. The fore and middle coxae have long yellow 

 hairs on their anterior faces ; the middle coxae have, besides, 

 some black bristles on their lateral surfaces. Trochanters 

 yellow. Femora metallic green, dusted with white, and with 

 yellow apices. Tibiae yellow, growing black towards their 

 apices, which are somewhat incrassated on the hind pair of 

 legs. Tarsal joints black, with yellow bases. Pulvilli yellow. 

 Wings hyaline, veins brown, becoming yellow towards their 

 bases. Halteres and tegulae yellow, the latter with somewhat 

 longer pale cilia than in D. pruinosa. 



A single specimen bearing the same date and locality as the 

 preceding species and also received from Mr. Chas. W. 

 Johnson. 



HULL ZOOLOGICAL LABORATORY, 



UNIVERSITY OF CHICAGO, October 15, 1897. 



