Fluke—Syrphidae of Wisconsin. 
237 
70. X. fragila n. sp. One male and one female from Dane County, 
also specimens from Burnett and Douglas Counties. Type 
locality, Dane County. Type male in author’s collection. 
July 29, 1917. Figures 48, 49. Specimens were taken in 
a wood lot among thick low growing vegetation. 
Male: Length 7.5 mm. A small, frail looking species 
with a narrow abdomen. Face yellow with whitish pollen 
and pile, lower mouth-edge and part of cheeks reddish 
yellow and connected with the yellow of the face with a 
dark area. Frontal triangle yellow with an obscure dark 
spot above each antenna, pile black; antennae mostly red¬ 
dish yellow, darker on upper side of third joint. Verti¬ 
cal triangle black with black pile; pile behind and along 
the occiput yellowish. Thorax shining metallic greenish 
black, side stripes somewhat indistinct, pile yellow; scutel- 
lum yellow with basal corners black, pile black and white 
mixed. Abdomen semi-opaque black, with yellow as fol¬ 
lows: first segment broadly on the sides, which slightly 
encroaches on the anterior corners of the second segment; 
second segment with a pair of spots, broadly separated 
and not reaching side margins; third segment with a band 
deeply emarginate behind but well separated from the 
side margins; fourth segment with a pair of spots; fifth 
with lateral edges only yellow; the posterior margins of 
segments four and five and the anterior corners of the 
third and fourth also yellow. Legs yellow, front and 
middle femora brown at base; hind legs with broad brown 
rings on the femora and tibiae. Wings hyaline. 
Female: Similar with the following exceptions: 
Larger, 8.5 mm. long. Front shining greenish black, 
dusted whitish on sides below. Antennae larger and much 
darker. Pile of pleurae and lower part of occiput whit¬ 
ish. Abdomen with yellow bands broadly interrupted and 
well separated from the margins. Hind legs darker, the 
tibiae and tarsi nearly all dark brown. 
Mesogramma Say (Toxomerus Macq.) 
1. Hind femora blackish or at least with a distinct brown ring 
in the female; thickened and arcuated in the male; scu- 
tellum dark with a distinct entire yellow border. 
.... geminata 
Legs almost entirely yellowish, hind femora of male simple; 
scutellum nearly always yellowish, seldom dark with a 
yellow border . 2 
