HORSEFLIES OF THE SUBFAMILY TABANINAE 11 
A single Nearctic species, Bolbodimyia atrata (Hine). 
The single genotypic specimen of Snowiellus atratus Hine was 
made available for study through the kindness of the University of 
Kansas. Although it has the first antennal segment less swollen than 
have other species of Bolbodimyia, it 1s, in every other respect, par- 
ticularly in the wing pattern and venation, so like the typical 
Bolbodimyia that it seems inadvisable to consider it generically dis- 
tinct. In the type specimen the first antennal segment is pointed 
downward and the second and third strongly upward, accentuating 
the ventral swelling of the first segment. 
BOLBODIMYIA ATRATA (Hine), new combination 
(Fig. 2, A) 
Snowiellus atratus Hine, Ohio Nat. 5: 280-231, 1904; 10: 151, 1910. 
Rather small; black; wing dark, with a narrow, hyaline, apical margin; 
subcallus shiny, much swollen. 
Female.—Length 12 mm. Eye bare. Frons not quite three times as high as 
width at base, distinctly narrowed above; basal callus large, protuberant, shiny 
brown, with extensions of the denuded area margining eyes about to top of 
large, flat, median callus, which joins basal callus by a narrow median con- 
Ficurp 2.—Antenna, front view of head, and palpus of (A) Bolbodimyia atratu and 
(B) Whitneyomyia beatifica. 
nection; some denudation at vertex but no ocellar tubercle; subeallus very 
swollen, shiny, nearly black. First antennal segment shiny black, with black 
hair, scarcely swollen above, but distinctly so below, with a tuft of short hair 
on lower surface; second segment small, black, with a distinct dorsal process ; 
third orange brown, annulate portion darkened; basal portion long and slender, 
with a short, blunt, dorsal angle; annulate portion nearly as long as basal 
portion. Clypeus with thin brown pollen except around clypeal pits; genae 
shiny black. Palpus black, with black hair, the second segment rather slender 
and curved. Proboscis reaching to apex of fore coxa. 
Thorax, legs, and abdomen black, with black hair. Haltere pale brownish. 
All tibiae slightly swollen, the hind tibial fringe very well developed. Wing 
dark brownish anterior to middle of cell Rs, subhyaline posteriorly ; extreme 
apex of wing with crescent-shaped, hyaline margin; base of vein R: sharply 
angulated but with no stump, apical half turned abruptly forward. 
Male——Unknown. 
Type.—Female, in the collection of the University of Kansas. 
Type locality—Oak Creek Canyon, Ariz. 
Distribution.—Known from single specimen collected in July. 
The Genus WHITNEYOMYIA Bequaert 
Tabanus subgenus Whitneyomyia Bequaert, Boston Soc. Nat. Hist. Occas. Papers 
8: 84-85, 1983. (Genotype, Tabanus beatificus Whitney.) 
Generic characters.—Eye bare; no ocelli or ocellar tubercle; frons of fe- 
male broad, narrowed above; subcallus, clypeus, and genae denuded, the sub- 
callus greatly swollen and clypeus and genae slightly so; first antennal seg- 
ment not noticeably swollen; third segment slender and attenuate, with five 
