HORSEFLIES OF THH SUBFAMILY TABANINAE 87 
somewhat narrowed above; median callus a narrow concolorous line somewhat 
longer than basal callus; often a flat denuded spot at vertex of same color. 
Subeallus, clypeus, and genae yellowish brown, with yellowish hair below 
antennae. Antenna uniformly orange brown, the third segment with a prom- 
inent, forward-projecting, dorsal process, not quite reaching base of annulate 
portion. Palpus crange brown, with short concolorous and black hair, the sec- 
ond segment of moderate length and thickness. 
- Thorax above dark reddish brown, with faint gray stripes; tufts of pale hair 
around wing base and on pleura. Wing hyaline, the costal region and base of 
wing dark brown, the cross veins and furecation margined with brown and 
sometimes the tips of veins Rez and Rs each with a brown cloud; cell Rs some- 
what narrowed apically. Legs orange brown to dark reddish brown, with con- 
colorous hair; hind tibial fringe orange brown to black. 
Abdomen dark reddish brown, with a median row of small white triangles; 
venter reddish brown, the sternites with narrow, pale hind margins. 
Male——Areas of large and smali facets of eye distinctly differentiated, a 
narrow band of the smaller facets extending along margin to vertex. Colora- 
tion as in the female, the abdominal spots very small. 
Type.—F emale, in the British Museum. 
Type locality. Georgia. 
— Distribution—North Carolina to Florida. March 26 (Silver 
Springs, Fla.) to June 15 (Lake Waccamaw, N.C.). In the United 
States National Museum, 52 females, 2 males. 
TABANUS IMITANS variety EXCESSUS, new variety 
Tabanus fuscopunctatus Howard (not Macquart), The Insect Book, pl. 16, fig. 9, 
1901. 
Female.—Length 19-21 mm. Differs from the typical imitans in that the 
dorsal angle of the third antennal segment is rectangular or slightly acute only 
and does not have the prominent forward projection, and there is a tendency 
for the dark spots of the wing to be more extensive, the apex of some or all 
of the longitudinal veins which end in the outer half of the wing narrowly 
-margined with brown. 
Male.—Unknown. 
Type—Female, United States National Museum No. 51967. Para- 
type, United States National Museum No. 51967; other paratypes in 
collections of Museum of Comparative Zoology, C. S. Brimley, C. B. 
Philip, and J. Bequaert. 
Type locality —Enterprise, Fla. 
Distribution —F lorida (Enterprise, Eureka, Gainesville, Levy 
County), May. 
The type was collected May 21 and is figured in Howard’s Insect 
Book, Plate XVI, figure 9, as fuscopunctatus. 
TABANUS ATRATUS Fabricius 
The Black Horsefly 
(Fig. 35) 
Tabanus americanus Drury, Illustrations of Natural History, v. 1, p. 104, pl. 
14, 1773. (Preoccupied by Tabanus americanus Forster.) 
Tabanus atratus Fabricius, Systema Entomologiae, p. 789, 1775; Wiedemann, 
Aussereuropaische zweiflitigelige Insekten, v. 1, pp. 114-115, 1828; Bellardi, 
Saggio ditterologia messicana, pt. 1, p. 58, 1859; Osten Sacken, Mem. Boston 
Soe. Nat. Hist. 2 (pt. 4, No. 4) : 454455, 1876; Smithsn. Misc. Collect No. 
270, p. 57, 1878; Hart, Il. State Lab. Nat. Hist. Bull. 4:.242, 1895; Hine, 
Ohio State Acad. Sci. Spec. Papers 5: 48, 1903; U. 8. Dept. Agr., Bur. Ent. 
Tech Ser. 12: 34-36, 1906; La State Crop Pest. Comn. Cir. 6: 15-18, 1906; 
La. Agr. Expt. Sta. Bull. 93: 4445, 1907; Johnson, Psyche 26: 163-165, 
1919; Davis, Ill. State Nat. Hist. Survey Bull. 13: 97-99, 1919; Bromley, 
Ann. Ent. Soe. Amer. 19: 440460, 1926; Stone, Ann. Ent. Soc. Amer. 23: 
294-296, 1930; Philip, Minn. Agr. Expt. Sta. Tech. Bull. 80: 103, 1931; 
