1941] 
New Species of Syrphidx 
151 
darker, basally thickened. Facial tubercle fairly prominent, 
quite pointed ; it and a widening stripe upward to antennse 
shining black. A large triangular spot or callosity above 
antennse, enclosing on each side a small yellow spot, shining 
black. Remainder of face and cheeks bright shining yellow, 
with a trace of white pile on the former. Mid occipital ex- 
cision large and conspicuous. Thorax: black, moderately 
shining with suggestions of four narrow brown pollinose 
vittse. Pleurae vitreous black with sharp, pale yellow spots 
continued as a narrower stripe on the dorsal suture. Scu- 
tellum pale yellow, dully shining, narrowly black in the cor- 
ners. Pile of dorsum erect, microscopically short, except for 
the anterior collar of pile. No ventral scutellar fringe. 
Abdomen: slender and elongate, terminal segments two and 
one-half times as wide as second. The second segment 
scarcely constricted anywhere; six times as long as wide. 
First segment black, its sides basally yellow. A suggestion 
of a small brown spot on the black second segment on each 
side of the middle. Remaining segments dark brown or 
black, shining, with yellow brown marks; on the third, on 
either side, a wide acute V, its sides thick, its ends sharp. 
On the fourth segment a long slender vertical spot near the 
midline on either side and lateral to this a shorter anteriorly 
placed, elongate spot. Posterior margin of fifth segment 
yellowish brown. Hypopygium long, nodular, rounded at 
tip. Abdomen thickly, short, black, bristle-covered. Ab- 
domen larger than wings. Legs: coxae and trochanters 
brown, femora black to brown, with apices narrowly yellow. 
Fore tibiae dark brown, apices and base yellow; mid and 
hind tibiae entirely dark, except basal third which is yellow. 
Tarsi brown, fore and mid basitarsi yellow. Pile of legs 
short, black. Mid femora slightly thicker than post femora. 
Wings: hyaline, whole marginal cell brown, whole costal 
cell yellow. 
Female. Quite similar to male. Costal cell brown. Black 
of the face ascends to vertex, leaving each side of front nar- 
rowly yellow. 
One male and one female, Bella Vista, Panama (Nathan 
Banks) . Type male, in the collection of the Museum of 
Comparative Zoology. Paratype female in the collection of 
the author. 
