PSYCHE 
Vol. 70 
December, 1963 
No. 4 
A NEW GENUS AND SPECIES OF 
NEOTROPICAL HORSEFLY 
(DIPTERA: TABANIDAE)* 
By G. B. Fairchild 
Gorgas Memorial Laboratory, Panama, R. de P. 
The Neotropical Tabanidae are remarkable for the number of 
bizarre forms which have developed, especially in the Tribe Dia- 
chlorini. Of the 146 generic names proposed at one time or another 
to include Neotropical Tabanidae, 65 were proposed for Diachlorini. 
The mortality rate among these names has been high, and conserva- 
tive students of the family will probably recognize hardly half of 
these as useful. The proposal of another new genus in this fauna 
may thus appear somewhat foolhardy; nevertheless, the subject of 
this note presents a so far unique combination of characters which 
disturbs current ideas as to relationships within the Tribe. 
Querbetia gen. nov. 
Eyes bare, apparently with green bands in life. Frons broad, less 
than twice as high as basal width, with basal callus as wide as frons. 
Vertex with vestiges of ocelli. Antennae with first segment very 
greatly inflated and shiny, second segment short and normal, third 
segment lacking in the only known specimen. Proboscis with theca 
and labella extensively sclerotized and shiny. Wing venation normal, 
the subepaulet or basicosta lacking strong setae. Abdomen with 
second segment narrowed, giving a wasp-waisted appearance. Legs 
without hind tibial spurs or hind tibial fringes. The name is an 
anagram of that of Dr. Joseph Bequaert and is masculine. Type 
and sole species of the genus, Querbetia bequaerti n. sp., described 
below. 
Querbetia bequaerti n. sp. 
A blackish wasp-like insect with greatly inflated and shiny sub- 
callus and basal antennal segments, constricted abdomen and wings 
with anterior half black. 
* Manuscript received by the editor June 10, 1963. 
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