1942] 
Neotropical Syrphidee 
105 
of subbasal, widely separated, rather large, posteriorlaterally 
convex, yellowish-brown triangles. They are separated from 
the narrow, yellow lateral margin of the anterior half of the 
segment, but are slightly produced in the direction of the 
margin. Fourth segment with similar pattern. Fifth segment 
with a pair of subbasal, transverse spots narrowly connected 
across the middle posteriorly. Legs: yellow, the tarsi light 
brown, the hind tarsi darker basally and apically, the hind 
femora with a dark brown subapical annulus, their tibiae with 
a subbasal annulus. Wings: hyaline, the alulae large. 
Holotype: a female. Villarica, Paraguay, March 4, 1938, 
F. Schade. (In the collection of C. L. Fluke.) 
Mesogramma alphabetica n. sp. 
Characterized by the pair of large, yellow, crescentic spots 
on the base of the third and fourth segments which are nar- 
rowly fused with the lateral triangles. Related to confusa 
Schiner. 
Female. Length 4 mm. Head: face, the narrow sides of front 
and all of the antennae except the blackish dorsal half and apex 
of third antennal joint, pale yellow. The cheeks and the middle 
of the front are shining black, the latter bluish margined; ver- 
tex golden. Thorax: mesonotum shining blackish with steel- 
blue median vittae, the wide lateral margin of the humeri and 
margin of scutellum yellow, the mesonotum yellow, narrowly 
black marginate, followed by an obscurely bluish stripe. Disc 
of scutellum black, all its pile long and black. Abdomen : oval, 
rather broad; first segment black with yellow corners and 
margins; second segment with narrow, central, laterally arcu- 
ate, linearly divided yellow fascia. Third segment with two 
large, thick, deeply crescentic, basal yellow spots facing one 
another and narrowly connected basally with the large, yellow, 
equilateral triangles. Fourth segment with similar pattern, not 
connected basally. Fifth segment with similar pattern, the 
more elongate triangles widely separated. Legs: yellow, first 
four femora with blackish dorsal subapical spots. Hind pair 
black on apical half except its apex, their tarsi and tibiae except 
extreme base blackish; other tarsi light brown; last front tarsus 
yellow. 
Holotype: a female. Jalapa, Vera Cruz, Mexico, July 8, 
1935, A. E. Pritchard. (Collection of C. L. Fluke.) 
