Fluke—Syrphidae of Wisconsin. 243 
Abdomen with definite yellowish or whitish cross-bands...... 11 
11. Hind coxae of male with a stout process below; grey thoracic : 
stripes of female narrower than intervening black ones.. 
. chrysostomus 
Hind coxae without such process; grey thoracic stripes of fe¬ 
male broader than the black lines ..............distinctus 
101. H. latifrons Loew. Walworth, Milwaukee, Washington, 
Door, Winnebago, Manitowoc, and Dane Counties. Early 
spring to late fall. Figures 69, 70. 
102. H. similis Macq. Dane, Manitowoc, Vilas, Milwaukee, Door, 
and Washington Counties. Figure 71. 
103. H. obsciDrus Loew. Vilas and Dunn Counties. One male 
and two females. July to September. Figure 72. 
This species has been recorded from Colorado and Wy¬ 
oming. Loew’s description is rather short, but the speci¬ 
mens agree in almost every detail. The specimen from 
Wyoming noted by Moodie “ agrees with the description 
save there is no brown ring on the hind tibiae, the abdo¬ 
men is more shining and some of the cross-bands are not 
interrupted”. Notes on the Wisconsin specimens are as 
follows: 
Male: Antennae dark reddish, almost blackish on up¬ 
per side of the third joint. Face with a black-shining 
stripe, without pollen, extending from oral margin to an¬ 
tennae, going around the base of the antennae and ex¬ 
tending quickly to a point in the front, otherwise the face 
covered with yellowish pollen and pile; vertex opaque 
black with black pile. Cheeks shining black and con¬ 
nected by a narrow margin with the facial stripe. Front 
a trifle wider than that of similis. Thorax opaque black 
with yellowish pile and four yellow pollinose stripes; the 
median ones are subinterrupted about midway by a cup- 
like laterad depression, the stripes then nearly fade out 
but suddenly broaden before reaching the scutellum, which 
is translucent yellow. Abdomen opaque black (slightly 
shining on the posterior margins of the segments) with 
three distinctly interrupted yellow crossbands; first seg¬ 
ment opaque black, lateral margins yellow; second seg¬ 
ment with large yellow spots separated by about one half 
their own width, reaching the lateral margins and joining 
the yellow of the first segment; spots on third segment a 
trifle smaller, touching the fore margins of the segment 
hut reaching the lateral margins by the anterior corners 
