48 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



margin of winc^ scarcely indented at tip of fifth vein, evenly rounded, 

 the anal angle being nearly obsolete. 



Female. — Face wider than in the male, still not very wide for a 

 female, silvery white; middle tibiae with one bristle below and their 

 basitarsi without a bristle above; the third and fourth veins are 

 convergent as in the male. 



Redescribed from 7 males from the following locations: Lake 

 Mills, Wisconsin, Aug.; Big Stone, South Dakota, Aug. (Aldrich) ; 

 Ithaca, New York, May 19; Lewiston, New York, Aug. 1; Fort Erie, 

 Ontario, June 9 (Van Duzee). Ost6n Sacken reports it from Illinois. 



Type locality.— ''MiM\q States." 



No. 11. DOLICHOPUS MYOSOTA Osten Sacken. 



DoUchopus myosota, Osten Sacken, Biologia Centrali Americana, Diptera, vol. 

 1, 1887, p. 213.— Melander and Brues, Biological Bulletin, vol. 1, 1900, p. 148. 



ifaZe.— Length 4 mm.; of wing 3.5 mm. Face very narrow, 

 silvery white. Front dark but shining green. Antennae wholly 

 black; third joint but little longer than wide, oval but rather pointed 

 at tip, lower orbital cilia white, the lower ones a very little flattened, 

 the black cilia descending nearly to the middle of the eye hight. 



Thorax and abdomen dark shining green with blue reflections, 

 sometimes also with a little bronze on the fore part of the dorsum; 

 pleurae and sides of the abdomen dulled with white pollen. Hypo- 

 pygium black; its lamellae (fig. lla) small, triangular, rather trun- 

 cate at apex, white with very narrow black border on apical margin, 

 scarcely jagged at lower corner, fringed on apical margin with delicate 

 hairs. 



Coxae, legs and feet black, knees a very little yellowish. Fore 

 coxae with white pollen and with little black hairs on inner half, and 

 white hairs on outer half of their anterior surface. Middle and hind 

 femora each with one preapical bristle; the latter with a row of dark 

 hairs on lower inner edge, these hairs scarcely long enough to call 

 cilia. All femora usually tinged with green. Posterior tibiae 

 thickened, especially at tip, with rather long hair on inner side. Fore 

 tarsi about equal to their tibiae in length, first joint about as long as 

 the remaining four taken together. Middle and hind tarsi dis- 

 tinctly longer than their tibiae, middle basitarsus without a bristle 

 above. Calypters and halteres yellow, the former with black cilia. 



Wings slightly grayish (fig. 11) darker in front of second vein; 

 costa not enlarged at tip of first vein; last section of fourth vein bent 

 just before its middle; hind margin of wing scarceh^ indented at tip 

 of fifth vein, evenly rounded, the anal angle being obsolete. 



Female. — Face as wide as the front, its pollen white; third antenna 

 joint not as long as wide; orbital cilia not at all flattened; hairs of 



