1949] 
Hull — Syrphid Flies 
135 
femora are yellowish brown, but those of the middle fe- 
mora are darker and the bind pair are entirely black ex- 
cept at the acute basal union with the trochanters and a 
small yellow ventral apical spot. The pile of the femora 
is yellow with sharp black setae ventrally upon the outer 
third of the bind pair. The bind femur is distinctly more 
enlarged and thickened than in most species of Quichuana. 
The anterior tibiae are reddish brown, obscurely darker 
near the apex anteriorly and posteriorly. The middle 
tibiae are similar. The bind tibiae are unusually arcuate, 
quite flattened and nearly black from a lateral view ; they 
are a little more reddish medially, their ventral margin 
black pilose, their medial pile yellow except apically 
where it becomes black or dark reddish brown. The an- 
terior and middle tarsi are brownish black on the second, 
third and fourth segments, lighter on the remainder. All 
of the bind tarsi are quite black with black pile. Wings: 
with distinctly two shades of color in addition to the hya- 
line portion. The costal and first basal cell behind the 
spurious vein and the whole of the second basal cell are 
distinctly pale brownish yellow. The subcostal cell, mar- 
ginal, all of the submarginal cell, except the loop, all of 
the first basal cell above the spurious vein and the antero- 
basal corners of the first posterior cell, are rather deep 
sepia brown. Abdomen: The first segment black and 
nearly opaque with only a few, posteriorly directed, fine, 
yellow hairs and an oval, medial patch of yellow pollen in 
the middle. There is yellow, laterally directed, matted 
hair only upon the sides and not entirely throughout the 
posterior half of the segment. The second segment is 
shining black with a distinct, rather large, nearly equi- 
lateral, rounded triangle of opaque black lying on the 
middle of the base of the segment and extending half the 
length of the segment. The pile of this segment is widely 
yellow upon the sides extending from the posterior cor- 
ners diagonally but narrowly to the base of the segment 
in the midline, the remainder of the pile is black and also 
nearly erect. Third segment shining black with a narrow, 
basal band of brassy yellow pile of nearly uniform width 
but expanding close to the lateral margins to include the 
