84 MISC. PUBLICATION 305, U. S. DEPT. OF AGRICULTURE 
Abdomen dark reddish brown to nearly black, often with a gray band on 
hind margin of each tergite and sternite, somewhat widened laterally. 
Male.—Areas of large and small facets of eye distinctly differentiated, the 
small facets extending around margin of eye to vertex. Coloration of body 
very similar to that of female, but usually somewhat lighter in color than most 
females, 
FIGoRE 31.—Antenna, front view of head, and palpus of Tabanus americanus. 
Type.—Female, collection unknown. 
Type locality. —Virginia and “Provincia Noveboracensi, Americae 
Septentrionalis.” 
Nstribution.—Southeastern part of the United States from Massa- 
chusetts to Florida and west to Oklahoma and Texas; Bahamas. 
March 15 (Paradise Key, Fla.) to August 22 (Cohasset, Mass.). In 
the United States National Museum, 102 females, 51 males, 
TABANUS GIGANTEUS Degeer 
(Fig. 32) 
Tabanus giganteus Degeer, Memoires pour servir a l’histoire des insectes, 
v. 6, pp. 226-227, pl. 30, fig. 1, 1776;- Osten Sacken, Mem. Boston Soc. Nat. 
Hist. 2 (pt. 4, No. 4): 458-459, 1876; Hine, Ohio State Acad. Sci. Spec. 
Papers 5: 51, 1903. 
Tabanus lineatus Fabricius, Species Insectorum, v. 2, pp. 455-456, 1781; 
Wiedemann, Aussereuropaische zweifitigelige Insekten, v. 1, p. 115, 1828. 
? Tabanus pallidus Palisot de ern ee Insectes recueillis en Afrique et en 
Amerique, pp. 100-101, pl. 2 eles: 
Tabanus bicolor Macquatt, eee exotiques nouveaux ou peu connus, sup. 
2, pp. 387-38, 1847. 
Tabanus caesiofasciatus Macquart, Diptéres exotiques nouveaux ou peu connus, 
sup. 5, pp. 52-58, 1855. 
Large; thorax brownish and abdomen blackish; rarely faint median triangles 
on abdomen; palpus yellowish; wing uniformly dilute brown, with yellow- 
brown costal cell and without brown spot at fureation. 
Female.—Length 22-25 mm. Eye bare, unicolorous. Frons about four and 
one-half times as high as width at base, with sides parallel or nearly so, 
yellowish brown, with short black hair: basal callus dark reddish, slightly 
narrower ‘than frons, tapering into the slender median callus, which reaches 
over half way to the grayish vertex; subcallus pale yellow. Antenna orange 
brown: first segment somewhat expanded apically, with short black hair; 
third with a prominent dorsal angle, slightly projecting forward, and a deep 
dorsal excision; basal portion with a rather distinct angle midway of ventral 
margin; annulate portion slender, about equal in length to basal portion beyond 
dorsal angle, the annuli distinct. Clypeus and genae white, with pale-yellow 
hair. Second palpal segment yellowish brown, with short black hair, elongate 
and compressed, the tip rather square. 
