136 MISC. PUBLICATION 305, U. 8. DEPT. OF AGRICULTURE 
TABANUS EPISTATES Osten Sacken 
(Fig. 65, A) 
Tabanus socius Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 (pt. 4, No. 4): 467, 
1876. (Preoccupied by Tabanus socius Walker.) 
Tabanus epistates Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 (sup.): 555, 
1878; Malloch, Ill. State Lab. Nat. Hist. Bull. 12: 360, 1917; McDun- 
nough, Canad. Ent. 53: 142-143, 1921; Philip, Minn. Agr. Expt. Sta. Tech. 
Bull. 80: 33, 105, 1931. 
Tabanus epistatus Hine, Ohio State Acad. Sci. Spee. Papers 5: 50, 1903; Hine, 
Ohio Nat. 5: 236, 1904. 
Rather small; orange brown on sides of abdomen extending across first 
tergite; subcallus pollinose; antenna mostly orange, with a pronounced dorsal 
angle; second palpal segment swollen at base. 
Female.—Length 13-16 mm. Eye with short pile, green blue, with three dark- 
purple bands. Frons about five times as high as width at base, but distinctly 
widened above, gray or yellowish brown, with black hair; ocellar tubercle shiny 
dark red, prominent; basal callus dull black, nearly square, usually not quite 
touching eye margins; median callus linear, joined to basal callus and reaching 
half way to vertex; subcallus, clypeus, and genae gray, often tinged with yel- 
FIGURE 65.—Antenna, front view of head, and palpus of (A) ZYabvanus epistates and 
(B) @. haemaphorus. 
low; hair of clypeus and genae cream colored. Antenna orange, the apex of 
third segment sometimes darkened; first two segments with black hair; basal 
portion of third rather broad, with a distinct dorsal angle and moderate dorsal 
excision; annulate portion distinctly shorter than basal portion. Second palpai 
segment swollen basally, tapering to a sharp apex, white or cream colored, with 
black and white hair. Proboscis rather short. 
Mesonotum dark gray, with black and white hair, the usual lines rather 
indistinct ; prescutal lobe reddish. Pleura, sternum, and coxae dark gray. Wing 
hyaline, the costal cell and vein margins of fore part of wing often distinctly 
tinged with brown; venation normal. Femora black, with gray pollen; fore 
tibia at base, entire middle tibia, and hind tibia except apex orange; tarsi dark 
reddish to black; legs with gray and cream-colored hair, the hind tibial fringe 
black, with scattered cream-colored hairs near base. 
Abdomen above black, with sides of tergites 1-4 largely orange, extending 
across first tergite; median white spots small; venter orange brown, darker 
apically, and with a dark median spot on sternite 1, usually extending onto 
sternite 2. 
Male.—HKye with dense brown pile, the facets nearly uniform in size; clypeus, 
genae, and palpus somewhat browner than in female; second palpal segment 
distinctly swollen. Black stripe on abdomen somewhat more constricted on 
third segment than in female. 
Type.—One (No. 4026-2) of 10 cotype females in the Museum of 
Comparative Zoology, No. 4026, herein designated as lectotype. 
Type locality —F¥ort Simpson, Hudson Bay Territory. 
Distribution.—Alaska to Quebec and south to Utah, Ohio, and 
New York. May 30 (Meadville, N. Y.) to August 17 (Slave Lake, 
Alberta). In United States National Museum, 28 females, 8 males. 
