HORSEFLIES OF THE SUBFAMILY TABANINAE 95 
Male.—Areas of large and small facets of eye sharply differentiated. Palpus 
dark brown, with black hair. Dorsum of thorax with chocolate-brown pollen 
and pile. Coloration otherwise as in female. The male can scarcely be dis- 
tinguished from that of nigrescens, but in the latter the thorax above is even 
darker. 
Type.—Female, no longer in existence. 
Type locality.—Arkansas. 
MMNstribution.—Minnesota to Massachusetts and south to Texas and 
Florida. April 12 (Fort Meade, Fla.) to August 15 (Lunenburg, 
Mass.). In United States National Museum, 23 females, 3 males. 
TABANUS SUBNIGER Coquillett 
(Fig. 42, A) 
Tabanus subniger Coquillett, Ent. News 17:48, 1906; Stone, Ent. Soe. Wash. 
Proc. 37: 16-17, 1935. 
Large; thorax whitish and abdomen black; fore tibia uniformly dark; front 
of female very broad, gray. 
Ficgurbm 42.—Antenna, front view of head, and palpus of (A) Tabanus subniger and (B) 
T. fumipennis. 
Female.—Length 22-25 mm. Eye bare or very sparsely piiose. Frons gray, 
about twice as high as width at base, slightly narrowed above; vertex darker, 
with a median depression and erect black hair; basal callus shiny, dark brown, 
somewhat transverse, rounded and not quite touching eyes; median callus a 
short, indefinite line; subcallus, clypeus, and genae brown, with dark-brown 
hair below. Antenna dark reddish brown; first segment rather stout, although 
not distinctly widened apically ; third rather elongate and slender, with a mod- 
erate dorsal angle and distinct dorsal excision; annulate portion as long as or 
slightly longer than basal portion. Second palpal segment dark brown, rather 
heavy, not strongly swollen at base, with black hair and a few scattered pale 
hairs. 
Mesonotum reddish brown, with yellowish-white hair; rest of thorax dark 
brown, with black hair. Wing nearly hyaline, the cross veins and fureation 
margined with pale gray or brownish; costal cell yellowish; cell R; slightly 
narrowed apically. Legs black; hind tibial fringe black, well developed. 
Abdomen dark reddish brown to black; some yellowish-white hair laterally 
and on posterior margins of sternites. 
Male.—Antenna black, slender, the first segment nearly as wide as third and 
somewhat flattened above. Areas of large and small facets of eye distinctly 
differentiated. Mesonotum dark brown, with indication of stripes. Rest of 
coloration essentially as in female. 
Type.—Female, United States National Museum No. 8301. 
Type locality —tLake Forest, Il. 
Distribution.—Ulinois, Ohio, New York, and New Jersey. June 
27 (Lake Forest, Ill.) to July 20 (Ithaca, N. Y.). In United States 
National Museum, two females. 
