1942] 
Neotropical Syrphidce 
93 
latter is separated by a narrow black line. The pile of the face 
is yellow, of the front dense, long and black. In profile the 
tubercle is low and long. Antennae orange, the third apex of the 
joint considerably more narrow than the base. The dorsal rays 
of the arista are about twelve and blackish; the arista pale 
yellow. The vertical pile is yellow. Thorax: mesonotum and 
pleurae shining black, the wide lateral margins of the former 
including the humeri, the whole of scutellum and a spot in front 
of the scutellum light, subtranslucent brownish-yellow. All 
thoracic and scutellar pile is golden. Scutellar margin with 
three pairs of stiff yellow bristles and none in front of the 
scutellum. Marginal mesonotal bristles golden. Squamae and 
fringe yellow. Abdomen : light translucent brownish-yellow, 
the middle and the posterior border of the first segment, a median 
vittae and a lateral, elongate postmarginal fascia on the second 
segment shining black. Third segment with a similar but much 
narrower, medial, anteriorly attenuated, vittae and similar short 
fascia in the posterior corners. The fourth segment has a still 
narrower, median vittae attenuated at both ends and in each 
posterior corner an elongate vittate spot twice as long as wide. 
Pile of abdomen everywhere short, thick, erect and golden ex- 
cept on the black areas of the second segment where it is black. 
There are a few black hairs along the lateral portion of the post 
margin of the third segment. The whole pile of the fourth seg- 
ment is long, erect and golden. Legs: brownish-yellow, the 
anterior side of hind femora with an elongate, blackish-brown 
streak fading on the outer third. The narrow bases of the other 
femora are slightly blackish; the anterior and hind tibiae are 
narrowly blackish at apex; the last two tarsal joints blackish. 
Pile of legs golden except apically along the tibiae. Wings: 
hyaline with pale yellow veins and basal half of stigmal cell 
pale yellow. Stigma brown, twice as long as wide, costal setae 
black. 
Female. Similar to the male, the black cheek lines are faint 
or confined to a tiny spot on the eyes. Front pale yellow, the 
crescentic area along the eyes punctate, the area between the 
red ocelli blackish, its pile yellow. Mesonotum similar, the wide 
median black area replaced by light brown. The yellow pres- 
cutellar spot may be quite large. Pattern of abdomen similar. 
The median vittae upon the second segment is reduced to a 
slender brownish streak; the first segment may be wholly 
