1942] 
Neotropical Syrphidoe 
101 
brown, the third joint below and base of arista reddish. Sides 
of face narrowly yellowish. Thorax: mesonotum shining 
brownish-black with, viewed posteriorly, a pair of broad, sub- 
medial, brown pollinose vittae evanescent in the middle of the 
mesonotum but expanded anteriorly to form large triangles. 
Viewed anteriorly or laterally there are, between these vittae 
quite slender and almost touching, a pair of brown vittae. The 
pile of the mesonotum and scutellum and its ventral fringe 
black. Pleurae steel-bluish with a trace of white pubescence 
in the middle and with white pile. Squamae light brown with 
fringe brown. Abdomen: spatulate, the second segment about 
two and a half times as long as wide and subcylindrical. Third 
segment not quite twice as wide apically as basally. Fourth 
segment almost quadrilateral, barely wider apically. Abdomen 
shining black, bluish upon the first segment with a medial, 
opaque black vittae upon the second segment expanded some 
distance from the apex to form an oblique fascia reaching the 
curved-under lateral margin. Third segment with a pair of 
practically fused, slender, medial vittae proceeding from the 
base to within a short distance from the apex and narrowly 
separated from large, submedial triangles beginning near the 
base, ending where the medial vittae end and extending laterally 
out to the margin and almost to the apex. Fourth segment with 
a similar pattern, the submedial vittae separated, the lateral 
triangles smaller. Fifth segment with four slender vittate spots 
on the basal part of the segment. Lateral basal margin of 
second segment steel-blue. Pile of abdomen appressed and 
black, white ventrally on the sides of the first segment with 
long black pile above. Legs: first four femora dark brown, 
lighter at apex, their tibiae dark brown but pale narrowly at the 
base and at the extreme apex, their pile almost wholly blackish. 
The hind femora and tibiae, and all but the narrow apex of the 
hind basi tarsi, black and black pilose. Last hind tarsal joint 
brown; other three joints yellowish-white and white pilose. 
First four tarsi brown. Wings: deep brown except upon the 
apical fourth which is pale greyish hyaline. Anal crease well 
formed and brown. 
Holotype: a male. Villarica, Paraguay, March, F. Schade 
collector. 
