1942] 
Neotropical Syrphidoe 
99 
over the posterior margin and apex. The anal crease is long, 
blackish, well formed and reaching the apex. 
Holotype: a male. Villarica, Paraguay, March (F, Schade 
collector). 
Baccha bipunctipennis n. sp. 
Second abdominal segment eight to ten times as long as its 
middle width. The apical and central wing spots are less ex- 
tensive than in lanei Curran. Head femora and tibiae largely 
black, black pilose. 
Female. Length 10 mm. Head: the face, front and cheeks 
are shining blue-black, the sides of the front narrowly white 
pubescent, the pile on the sides long and white, black in front 
of the antennae and black and white above and confined to a 
narrow, medial row behind the ocelli. The occipital collar in 
the middle consists of a single row of pale yellow hairs but 
with shorter hairs outside, the upper hairs black. Face nearly 
straight in profile but retreating, white pilose and pubescent on 
the sides and lower middle. The antennae are short and dark 
brown, the third joint about as long as wide and more reddish. 
Thorax: shining black with sparse white pubescence, vertically 
over the middle of the pleurae and notopleurae; pile of mesono- 
tum and whole of scutellum erect and white, suberect anteriorly 
on the mesonotum and with a band of black pile across the 
middle; the long marginal hairs of the scutellum and about 
twenty long ventral fringe hairs are white. Abdomen: very 
slender upon the quite elongate second segment which must be 
eight or ten times as long as its narrowest width. Third seg- 
ment a little over four times as wide apically as basally. Fourth 
segment almost quadrilateral and barely narrowed apically. 
The remainder of the abdomen is drawn out into a long, flat- 
tened, very thin extension which may or may not be natural. 
The fifth segment is not quite twice as wide as long and 
scarcely narrowed; the sixth segment is of the same propor- 
tion and shape and only a little smaller. Following this is an 
additional flat extension two and a half times as long as wide 
and very little narrowed; the abdomen terminates beyond this 
in an acute, triangular, pointed, flattened, apically reddish 
ovipositor. Color of abdomen shining black, brownish-black 
upon the second segment and vaguely upon the corners of the 
fourth segment. The base of the third segment is somewhat 
