1963] 
Fairchild — Neotropical Florsefly 
195 
Female. Length, 14 mm., of wing, 12 mm. Eyes bare. Efforts to 
revive the eye pattern were not wholly successful, but suggest that 
the eye was probably green with two narrow parallel transverse 
dark bands. Frons slightly higher than basal width, narrowed above. 
Callus black, rugose, nearly filling lower half of frons, and leaving 
but two small thinly yellowish pollinose triangular areas separating 
callus from the wholly black and shiny vertex. Vestiges of three ocelli 
are visible close to the lower margin of the shiny area of vertex. Sub- 
callus greatly inflated, black and shiny, with a strong median groove 
dividing it into two hemispherical halves. Fronto-clypeus and genae 
thinly yellowish pollinose, with a roughly wineglass-shaped bare area 
in center of fronto-clypeus, and large bare patches on genae, both 
bare areas dark brown to black. First antennal segments enormously 
inflated, black and shiny with sparse long hairs at base and on ventral 
surface. Second segment black and shiny, not inflated, with a strong 
dorsal spur and numerous black hairs. Third segment missing. Palpi 
black, subshiny, black-haired dorsally, longer ventral hairs brownish 
yellow. Proboscis black, the theca and a broad basal strip of labella 
sclerotized, shiny. 
Mesonotum blackish in ground color, subshiny to thinly grey pol- 
linose, with the sides and humeral callosities reddish, and a pair of 
dull reddish dorsolateral stripes. Vestiture of sparse black hairs, with 
some reddish brown hairs accentuating the dorsolateral stripes. Pleura 
blackish brown, thinly grey pollinose, sparsely dark-haired. Scutellum 
black, with black and sparse pale hairs. Legs black, black-haired, the 
basal thirds of all tibiae yellowish white, white-haired, the tarsi 
yellow and yellow-haired. No hind tibial fringe. No spurs on hind 
tibiae. Wing as figured, the basicosta bare, the dark portions deep 
brownish black, the clear portions yellowish tinged. 
Abdomen slender, the second segment slightly narrowed, the 
tergites dark brown, their posterior margins very narrowly yellowish. 
Vestiture of thin greyish pruinosity and sparse hairs, mixed black and 
yellowish, without noticeable pattern. Venter as dorsal surface, ex- 
cept that first four sternites are more densely white-haired, fifth and 
succeeding sternites dark reddish-haired. 
Holotype female, Tingo Maria (Rio Huallaga) Peru, 700 M., 
Aug. 1947, leg. Weyrauch. In Museum of Comparative Zoology. 
The abdomen is intact, though detached and glued to a card below the 
Explanation of Plate 20 
Oucrbetia bequaerti, n. sp. Fig. 1. Head in side view. Fig. 2. Frons and 
basal antennal segments. Fig. 3. Wing. 
