142 MISC. PUBLICATION 305, U. 8S. DEPT. OF AGRICULTURE 
as second; third reddish brown to nearly black, paler basally, with a moderate, 
obtuse, dorsal angle; annulate portion stout, slightly larger than width of 
basal portion. Clypeus and lower genae with pale-yellowish hair. Second 
palpal segment rather slender, tapering, yellowish brown to nearly black, with 
long yellowish and black hair. 
Thorax black, clothed with rather long grayish and black hair. Wing hyaline, 
with brown veins; costal cell and stigma brown, a brownish tinge along some 
of the longitudinal veins and central cross veins, and a faint spot at furca- 
tion. Legs dark brown to black, the bases of tibiae, particularly of the middle 
tibia, brownish. 
Abdomen rather stout, black, with narrow yellowish bands on hind margins, 
with yellow hair; occasionally reddish on side of second tergite; faint indica- 
tions of median grayish triangles on tergites 2-4, that on the second most 
distinct. 
Male.—Eye densely pilose, with the areas of large and small facets weakly 
differentiated; hair of clypeus, genae, and palpus black. Outer claw of fore 
tarsus distinctly larger than inner claw. Rest of coloration essentially as in 
female. 
ili\ 
FIGURE 68.—Antenna, front view of head, and palpus of (A) Tabanus sexfasciatus and 
(B) T. zonalis. 
Type.—Female; United States National Museum No. 26823. Para- 
types, eight specimens, United States National Museum No. 26823. 
Type locality—Camp 334, near Fairbanks, Alaska. 
Distribution—Holarctic from central Europe to Siberia, Alaska, 
and Labrador. June 11 (Mount McKinley National Park, Alaska) to 
July 19 (Golovin, Alaska). In the United States National Museum: 
Nearctic, 25 females, 1 male; Palaearctic, 6 females, 1 male. 
TABANUS ZONALIS Kirby 
(Fig. 68, B) 
Tabanus zonalis Kirby, Fauna Boreali-Americana, vy. 4, p. 314, 1837; Osten 
Sacken, Mem. Boston Soc. Nat. Hist. 2 (pt. 4, No. 4) : 4683-464, 1876; Smithsn. 
Misc. Collect. No. 270, pp. 56, 226, 1878; Bethune, Canad. Ent. 18: 167, 1881 
(compiled from Kirby); Hine, Ohio Nat. 5: 244-245, 1904; Philip, Minn. 
Agr. Expt. Sta. Tech. Bull. 80: 118-119, 1931; Fairchild, Boston Soc. Nat. 
Hist. Occas. Papers 8: 1389, 1934; Philip, Bull. Brooklyn Ent. Soc. 31: 
196, 1936. 
Therioplectes zonalis Townsend, Amer. Ent. Soc. Trans. 22: 58, 1895. 
Tabanus tarandi Walker, List of the Specimens of Dipterous Insects in the Col- 
lection of the British Museum, pt. 1, p. 156, 1848. 
Tabanus terrae-novae Macquart, Diptéres exotiques nouveaux ou peu connus, 
sup. 4, p. 339, 1850. 
Tabanus flavocinctus Bellardi, Saggio di ditterologia messicana, pt. 1, p. 61, 
1859. 
Medium sized; black, with broad yellow bands on abdomen; prescutal lobe 
reddish; hind tibia orange. 
Female.—Length 17-18 mm. Eye pilose, purple, with four green stripes. 
Frons yellowish gray, about three and one-half times as high as width at base, 
slightly widened above; ocellar tubercle prominent, yellowish brown or reddish, 
the vertex behind it shiny black; median callus black, lanceolate; basal callus 
shiny dark reddish or black, subquadrate, rounded above; usually narrowly 
