178 
Psyche 
[June 
NEW SPECIES OF NORTH AMERICAN 
DOLICHOPODIDtE (DIPTERA) 
By M. C. Van Duzee. 
Buffalo, N. Y. 
Mesorhaga pallidicornis sp. nov. 
Male: Length 3 mm. Face metallic green with abundant 
white pollen. Front blue-green with white pollen above the 
antennae and along the orbits. Occular bristles black, bristles 
at upper corners of the eyes yellow. Proboscis yellow; palpi 
black, yellow on apical half. Antennae with the two basal joints 
blackish; third joint reddish yellow, black on upper basal 
corner, nearly round in outline; bristles on second joint white; 
the basal arista brown. Orbital cilia white, becoming short 
above, scarcely reaching the upper orbit. 
Mesonotum, base of scutellum and metanotum shining 
blue; remainder of scutellum, pleurae and abdomen metallic 
green, pleurae dulled with white pollen. All bristles and hairs 
of the thorax and abdomen yellowish. Hypopygium shining 
black; its appendages testaecous, somewhat oval in outline, 
more than half as long as the hypopygium, their hairs small and 
yellow. 
Fore coxae, all femora and tibiae pale yellow; midd e and 
hind coxae black; hairs and bristles on all femora, coxae, and 
tibiae yellow, there are several blackish bristles on posterior 
tibi ae, but these appear yellow in certain lights, the hairs on 
fore coxae and lower surface of fore and middle femora are long 
and almost white. Tarsi longer than their tibiae, yellow, be- 
coming brown towards their tips. Joints of fore tarsi are as 
40-11-9-7-6; those of middle ones as 54-17-13-7-7; joints of 
posterior tarsi as 39-30-18-9-6. Knobs of halteres yellow. Ca- 
lypters yellow with a narrow brown border and long yellow 
cilia. 
Wings a little grayish; veins brown; venation as usual 
in the genus. 
Described from one male taken at Sandusky, Ohio, July 9, 
1904, by E. P. Van Duzee. Type in the author’s collection 
