68 MISC. PUBLICATION 305, U. 8. DEPT. OF AGRICULTURE 
Type locaiity—Trenton Falls, N. Y. 
Distribution.—Quebec and Newfoundland to Massachusetts. July 
12 (Mexico, Maine) to September 3 (Baddeck, Cape Breton Island, 
Nova Scotia). In the United States National Museum, seven females. 
The description of arborealis was published some time before the 
writer was persuaded that the 7abanus vivax Osten Sacken of Hine 
was not the same as the true 7. vivax Osten Sacken. It now becomes 
necessary to sink arborealis. For a discussion of the species Hine 
misdetermined, see 7’, fairchildi (p. 64). 
~af 
FIGURE 22,—Antenna, front view of head, and palpus of (A) Yabanus vivar and (B) 
T. gracilis ; 
TABANUS GRACILIS Wiedemann 
(Fig. 22, B) 
Tabanus gracilis Wiedemann, Aussereuropaische zweifliigelige Insekten, v. 1, 
pp. 156-157, 1828; Osten Sacken, Smithsn. Misc. Collect. No. 270, p. 228, 
1878; Williston, Kans. Acad. Sci. Trans. 10: 140-141, 1887; Philip, Ohio 
Jour. Sci. 86: 153, 1936. 
Rather small, slender; brown, with three rows of paler triangles on abdo- 
men; costal cell nearly hyaline; longitudinal veins of wing faintly bordered 
with brown; frons rather broad; basal portion of third antennal segment 
orange and rather short and broad. 
Female—tLength 11-16 mm. Eye bare. Frons brownish gray, parallel-sided, 
about three times as high as wide: basal callus shiny yellowish brown, not 
quite touching eyes, and tapering to a concolorous median callus of about 
same length; subcallus concolorous with frons. First two antennal segments 
yellowish, the first not swollen above; third orange, the basal portion rather 
short and broad, with a distinct dcrsal angle and only a shallow dorsal ex- 
cision; annulate portion about as leng as basal portion. Clypeus and genae 
whitish, with white hair. Second palpal segment rather slender, yellowish 
brown, with white and black hair. 
Mesonotum orange brown, with gray lines: rest of thorax and coxae gray. 
Wing hyaline, the costal cell and margins of all veins washed with brown; 
venation normal. Legs yellowish brown, the tarsi and apices of tibiae darker. 
Abdomen yellowish brown, with three rows of paler-brownish-gray triangles ; 
median triangles usually not quite reaching to anterior margins of tergites; 
sublateral triangles each with base on hind margin of tergite, the inner edges 
parallel to each other, the outer edges oblique; venter dull orange brown. 
Male.—Areas of large and small facets of eye sharply differentiated. Body 
coloration as in female. 
Described from two specimens, one collected at Fort Meade, Fla., 
August 18, 1930, by P. W. Oman and one at Fort Monroe, Va., 
August 16, 1928, by C. N. Smith. 
Type—Female, collection unknown. 
Type locality —Savannah, Ga. 
Distribution —Virginia to Florida. May 24 (Indiantown, Fla.) to 
December 23 (Pinellas County, Fla.). In the United States National 
Museum, 93 females, 2 males. 
This is one of the most abundant species in the southeastern part 
of the United States. 
