12 MISC. PUBLICATION 305, U. S. DEPT. OF AGRICULTURE 
divisions, the first with a small, obtuse, dorsal angle; wing dark brown; vein 
R, not turned abruptly forward apically; tibiae not swollen. 
The genotype is the only described species. 
Although Bequaert proposed Whitneyomyia as a subgenus of 
Tabanus, it seems to deserve generic rank. It lies near Bolbodimyia, 
differing in that the first antennal segment is not distinctly swollen, 
there is no hyaline margin at apex of wing, vein R: is not bent for- 
ward sharply, and the tibiae are not swollen. 
WHITNEYOMYIA BHATIFICA (Whitney) 
(Fig. 2, B) 
Tabanus ater Palisot de Beauvois, Insectes recueillis en Afrique et en Ameri- 
que, p. 101, pl. 2, fig. 5, 1812. «(Preoccupied by Tabanus ater Rossi.) 
Tabanus lugubris Macquart, Diptéres exotiques nouveaux ou peu connus, v. 1, 
pt. 1, pp. 145-146, 1838; Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 
(pt. 4, No. 4): 456, 1876; Hine, La. Agr. Expt. Sta. Bull. 98: 51, 1907. 
(Preoccupied by Tabanus lugubris Linnaeus. ) 
Tabanus beatificus Whitney, Canad. Ent. 46: 344-845, 1914. 
? Snowiellus stygius Enderlein, Mitt. Zool. Mus. Berlin 11: 353-854, 1925. 
Tabanus (Whitneyomyia) beatificus Bequaert, Boston Soc. Nat. Hist. Occas. 
Papers 8: 8485, 19388. ‘ 
Rather small; shiny black, with black wings; subcallus swollen; third 
antennal segment elongate. 
Female.—Length 15-15 mm. Hye bare. Whole body shiny black, with some 
whitish pollen above and below median callus, a thin coat of grayish pollen along 
anterior margin of mesoscutum, and, in some specimens, white hair on sides of 
abdominal tergites 1-3 or 4, leaving a median stripe of black about equal in 
width to each lateral white stripe. Frons two to two and one-half times as 
high as width across basal cailus, slightly narrowed above; basal callus trans- 
verse, Strongly protuberant; vertex depressed, with no ocellar tubercle; sub- 
eallus strongly protuberant. First antennal segment not swollen; second with 
a stout dorsal process; third slender, with a short, rectangular, dorsal angle, 
the basal portion nearly twice as long as wide and the stout annulate portion 
slightly longer than basal portion. Lower half of clypeus with brownish pollen. 
First palpal segment small; second moderately stout at base, tapering to a 
point. Proboscis only slightly longer than palpus. Wing black, without 
darker spots at furcation and cross veins; cell Rs slightly narrowed apically. 
Male.—Kye bare or sparsely pilose, the areas of large and small facets dis- 
tinctly differentiated and the former restricted. Frontal triangle strongly 
swollen, denuded. Second palpal segment about twice as long as thick, blunt 
apically. Body coloration essentially as in female. 
Described from two males in the United States National Museum 
from Perry, La., and Gainesville, Fla. 
Type—Female, Museum of Comparative Zoology No. 17057. 
Type locality.—F lorida. 
Distribution.—South Carolina, Georgia, Florida, and Louisiana. 
April 28 (Florida) to June 16 (Merryville, La.). In the United 
States National Museum, one female, two males. 
As Bequaert has pointed out, it is probable that Enderlein’s 
Snowiellus stygius is this species. It may become necessary to con- 
sider specimens with the abdomen with entirely black pile as forming 
a variety distinct from the typical but less common form with white 
hair laterally, but until more of the latter are found the writer prefers 
not to do so. 
The Genus DIACHLORUS Osten Sacken 
Diabasis Macquart, Histoire naturelle des Diptéres, v. 1, p. 207, 1834. (Geno- 
type, Tabanus bicinctus Fabricius.) (Preoccupied by Diabasis Hoffmann- 
segg and Diabasis Desmarest. ) 
