HORSEFLIHS OF THE SUBFAMILY TABANINAE 69 
TABANUS ZYTHICOLOR Philip 
(Fig. 23, A) 
Tabanus zythicolor Philip, Ohio Jour. Sci. 86: 152-153, 1936. 
Rather small; orange brown, with a median row of slender contiguous spots 
and sublateral round spots on abdomen; third antennal segment orange, not 
very elongate; basal callus brown; frons moderately narrow, with parallel 
sides. 
Female.—Length 11-14 mm. Hye bare, green, with two purple bands. Frons 
yellowish brown, parallel sided, three and one-half to four and one-half times 
as high as wide; basal callus shiny yellowish to chestnut brown, usually touch- 
YES 
FIGURE 23.—Antenna, front view of head, and palpus of (4) Tabanus zythicolor and (B) 
T. abactor. 
ing eyes and slightly higher than wide; median callus dark brown to black, 
joined to basal callus by a narrow line or completely separated; subecallus yel- . 
lowish brown. Antenna uniformly orange, the first two segments with black 
hair; third moderately stout basally, with distinct dorsal angle and scareely any 
dorsal excision; annulate portion slightly longer than width of basal portion. 
Clypeus and genae, except the brownish upper corners, gray, with white hair. 
Second palpal segment creamy white to yellowish brown, with black hair, 
moderately stout at base, tapering to a rather narrow apex. 
Mesonotum brown, with pale-yellowish, recumbent hair and short, black, 
erect hair. Pleura, sternum, and coxae gray, with white hair. Wing subhya- 
line, the costal cell yellowish brown; venation normal. Legs yellowish brown, 
the middle and hind tibiae paler, fore tibia usually somewhat darkened apically, 
and apical tarsal segments darker. 
Abdomen above dark orange brown, with a median row of slender yellowish- 
brown spots, which expand at posterior margin of each tergite, and oblique, 
elliptical, sublateral spots usually narrowly separated from hind margin of 
tergites; venter nearly uniformly brown. : 
Male—Areas of large and small facets of eye not sharply differentiated ; 
second palpal segment pale yellow, about twice as long as thick, with blunt 
apex. Body coloration essentially as in female, but slightly darker. 
Type.—Kemale, in the collection of C. B. Philip. Allotype, collec- 
tion of C. B. Philip; paratypes in the Ohio State Museum, the 
Museum of Comparative Zoology, the Rocky Mountain Spotted Fever 
Laboratory, Hamilton, Mont., and the United States National 
Museum (No. 51964). 
Type locality —Oakdale, N. C. 
Distribution.—Virginia to Florida and Oklahoma. July 6 (Monti- 
cello, Fla.) to September 18 (Georgetown, S. C.). In the United 
States National Museum, 31 females. 
TABANUS ABACTOR Philip 
(Fig. 23, B) 
Tabanus abactor Philip, Ohio Jour. Sci. 36: 1538-154, 1936. 
Tabanus gracilis Sanborn, Stiles, and Moe (not Wiedemann), Okla. Agr. Expt. 
Sta. Bull. 204, 1932. 
Rather small; brown, with three rows of pale triangles on abdomen; basal 
portion of third antennal segment orange, moderately stout, with a distinct 
dorsal angle; palpus whitish; faint spot at furcation. 
