214 
Psyche 
[September 
largely black-haired, with a broader posterior fringe of pale yellow 
hairs. Third and fourth segments with still broader pale-haired mar- 
gins, while segments 5 to 7 are wholly dark-haired. Beneath the 
abdomen is subshiny, brown, mainly dark-haired, but with sparse pale 
hair fringes on first 2 visible segments. 
Holotype $, Avispas, Madre de Dios, Peru, 20-30 Sept. 1962, L. 
E. Pena coll. In Canadian National Collection, Ottawa. 
The close structural resemblance of this species to Q. bequcierti 
(Fairchild 1964) indicates that the antennae of the latter were prob- 
ably also similar. The color differences are considerable, however, 
and though it is possible that the present species is no more than a 
subspecies of bequaerti , much more material would be necessary to 
settle the matter. This specimen does not appear teneral. 
The structure of the third antennal segment indicates that the 
genus is closest to Acanthocera, though considerably more specialized 
in its head characters. It is obviously a mimic of some hymenopteran, 
and quite possibly arboreal in habits. The superficial resemblance to 
the recently described Amazonian Rhinomyzine Betrequia Oldroyd 
(Oldroyd 1970) is remarkable, but Querbetia lacks ocelli and hind 
tibia.1 spurs, and has bare eyes and normal wing venation. 
References 
Fairchild, G. B. 
1964. A new genus and species of Neotropical horsefly (Dipt. Taban.) 
Psyche 70(4) : 193-196, 3 figs. (1963) 
Oldroyd, H. 
1970. A new genus of Rhinomyzini (Dipt. Taban.), the first from 
South America. J. Nat. Hist., 4: 249-253, 4 figs. 
