1942] 
Neotropical Syrphidoe 
107 
the humeri and the lateral margins yellow, the scutellum black 
with light brown margin. Abdomen: flattened and rather 
broad, the first segment black except upon the anterior lateral 
corners. Second segment black with yellow pattern as follows: 
a pair of submedial spots rounded posteriorly, concave medi- 
ally, angulate anteriorly and diagonally attenuated as they 
extend towards the lateral margin and somewhat in the direc- 
tion of the anterior corners. They are narrowly separated from 
a lateral, obtuse triangle of yellow whose long face lies upon 
the lateral margin and which is continuous with the yellow of 
the anterior corners. Third segment with the anterior half of 
the lateral margin occupied by an acute triangle which is nar- 
rowly separated from a pair of crescentic yellow spots on either 
side of the segment. These crescentic spots lie close to but not 
touching a narrow, medial, linear, yellow stripe which is evanes- 
cent both anteriorly and posteriorly. Fourth segment similar, 
the lateral basal yellow triangle a little more distant from the 
crescent. This segment has basal corner triangle and small 
yellow crescents but no medial vittae. Legs: brownish-yellow, 
the hind femora and tibiae with wide subapical and subbasal 
smoky bands. Wings: pale brown hyaline; alulae narrow and 
strap-shaped. 
Holotype: a female, Rio Margajitas, Rio Pastaza, Equador, 
1250 meters, 20-111-29, F. M. and H. Brown collectors. (In 
collection of C. L. Fluke.) 
