1942] 
Neotropical Syrphidoe 
87 
opaque greenish-yellow with the sides, the narrow base and an 
extremely narrow rim black; its pile is black except upon the 
extreme rim. Squamae pale brownish-white with black rim and 
yellow fringe. Abdomen: short, broad, the first segment and 
upon the second segment a very broad, basally expanded, 
medial vittae slightly expanded before the apex and continued 
at this width over the third segment where it is expanded again 
apically. Fourth segment wholly black except for its post 
margin; it has a central, slender, transverse, medially indented, 
shining black fascia. The black portion only of the third seg- 
ment has a similar indented shining fascia. Segments two to 
four have each a wide yellow post margin; the sides of the 
second and third segment are left broadly light yellow, with in 
places a brownish tinge. The pile upon the black areas is black 
and is yellow basally upon the second segment and the corners 
of the third and fourth. Legs: shining black, the bases of the 
first four tibiae and the extreme base of hind tibiae brownish. 
Hind femora very little thickened, its pile golden except for a 
few black apical hairs and ventral short and long black bristles 
on the apical half. The hind tibiae ends transversely; hind 
trochanter without special hair. Wings: hyaline and bare. 
Holotype: a male. Bogota, Department Cundinamarca, alti- 
tude 2600 meters (Osorna, collector). 
Eristalis antiopa n. sp. 
Mesonotal pattern as found in jurcatus Wiedemann; scutel- 
lum slaty black, legs black, abdomen bluish-black. 
Female. Length 9.5 mm. Head: eyes short, yellowish-brown 
pilose; the face, cheeks and front are shining bluish-black, the 
latter yellow just before the antennae; the sides of the face are 
broadly silver pubescent and pilose. This pile extends laterally 
up to the middle of the front. The central frontal pile and 
occipital pile is widely black throughout. All but the upper part 
of the front is blackish pollinose, merging laterally into silvery 
pubescence; the front is bare just above the antennae and with 
a narrow, opaque, black vittae in the middle on the upper part. 
The antennae are black, the arista dark brown, bare and white- 
tipped. Thorax: the mesonotum is opaque bluish-black with a 
median black vittae proceeding from the base of the scutellum 
and dividing into two vittae in the middle of the posterior half 
of the mesonotum. There are a pair of similar undivided vittae 
