186 
Psyche 
[June 
half, and a ow of five on upper anterior edge, these last inserted 
at nearly regular intervals for their whole length, they also have 
a glabrous line on upper edge. Fore and middle tarsi black 
from the tip of the first joint, hind tarsi wholly black. Joints of 
fore tarsi are as 38-18-15-10-10; of middle ones as 49-23-17-14-13 
those of posterior pair as 42-45-29-18-15. Calypters and hal- 
teres yellow, the former with black cilia. 
Wings tinged with blackish; costa with an enlargement 
which fills in the space between the first vein and the costa at 
the tip of the first vein for a considerable distance; third vein 
bent backward towards the tip, nearly parallel with fourth; 
last section of fifth vein 42, of cross-vein 27 fiftieths of a milli- 
meter in length; cross-vein at nearly right angles to fourth vein; 
anal angle prominent. 
Female: Color of all parts as in the male, except that the 
posterior tibiae are a little more brown at tip; antennae as in the 
male; face a little wider and more convex on lower part; no 
cilia on the lower surface of posterior femora or tibiae; hind 
tibiae with three bristles in the row on upper posterior edge of 
basal half; wings without an enlargement of the costa. Other- 
wise about as in the male. 
Described from four males and one female, all taken at 
Stockton, Manitoba, July 29, 1924, by N. Criddle. Holotype 
and allotype in the Canadian National Museum. 
This is a very interesting species with a number of striking 
characters in the male; the female will be easily recognized by 
its dark wings; violet or blue front and thorax, dark upper edge 
of the anterior femora and the yellow hind tibiae with their 
wholly black tarsi. 
Gymnopternus Loew. 
At present I am useing the generic name Gymnopternus 
Loew (Neue Beitr., V, 10, 1857) in the sense of a subgenus of 
Hercostomus Loew (Neue Beitr., V, 9, 1857), following Dr. 
Lundbeck in this (Dolichopodidae of Denmark, 1912), however 
Dr. Theodore Becker unites the two genera under the name 
Hercostomus , not giving Gymnopternus even subgeneric value, 
