1942] 
N eotropical Syrphidoe 
97 
broad sides of the mesonotum and the post calli. The disc of 
the mesonotum is brassy brown with a pair of prominent, yel- 
lowish pollinose vittae that slightly diverge and become eva- 
nescent before they reach the scutellum. Between them there 
is a faint linear pollinose vittae. Scutellum pale yellow, the 
disc brownish-yellow, and sub translucent viewed from above, 
but brown when viewed obliquely. On the disc are eleven long 
black erect hairs and five upon the margin. I can only see a 
single central pair of elongate hairs constituting the ventral 
fringe. Abdomen : elongate and slender, brown to brownish- 
black apically, the sides of the first segment and its narrow 
base and the narrow basal corners of the second segment light 
yellow. Just before the apex of the second segment is an 
orange-brown, transverse fascia medially produced in front 
and narrowly margined with opaque brown. Third segment 
with an elongate, obscure, central yellow-brown triangle on 
either side, its apex bifid and the two triangles apparently 
contiguous on most of their medial length. Fourth segment 
similar, the subcoalescent triangle a little more distinct, the 
medial posterior indentation deeper leaving the figure some- 
what V-shaped on each side (inverted) and its lateral arm 
shorter. Fifth segment with prominent, narrowly divided sub- 
medial vittae that do not quite reach the apex but expand along 
the base of the margin to the corners and sublaterally emit a 
narrower stripe which is not quite as long as the submedial 
ones. Legs: wholly light brownish -yellow; there is a faint, 
preapical brown band on the hind femora. Pile of hind femora 
short, appressed and quite sparse. Wings: uniformly pale 
brown, the stigmal cell darker. 
Holotype: a male. Loma Rucilla and Mts. N., Dominican 
Republic, June 1938, 5-8,000 feet altitude (P. J. Darlington 
collector). One paratype, same data. 
Baccha cryptica n. sp. 
Second abdominal segment longer than third, six or more 
times as long as its subbasal width. Black flies, the wings 
smoky-brown almost to apex. Sides of the face broadly yellow. 
Related to ida Curran and clarapex Wiedemann. 
Male. Length 12 mm. Head: the face widely light yellow 
upon the sides, the cheeks blackish, the middle of face on the 
tubercle and above widely blue-black, narrow so below the 
