HORSEFLIES OF THE SUBFAMILY TABANINAE 73 
Distribution.—Oklahoma to Massachusetts and Virginia. July 15 
(Adair County, Okla.) to September 3 (Big Bald Mountain, Va.). 
In the United States National Museum, 23 females, 4 males. 
TABANUS SAGAX Osten Sacken 
(Fig. 25, B) 
Tabanus sagax Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 (pt. 4, No. 4): 
452-453, 1876; Hine, Chio Nat. 7: 26, 1906; La. Agr. Expt. Sta. Bull. 938: 
56, 1907; Ohio Nat. 14: 226, 1914; Fairchild, Boston Soc. Nat. Hist. Ocecas. 
Papers 8: 141, 1934; Philip, Ohio Jour. Sci. 36: 151, 19386. 
Atylotus baal Townsend, Amer. Ent. Soc. Trans. 22: 58-59, 1895. 
Tabanus dawsoni Philip, Minn. Agr. Expt. Sta. Tech. Bull. 80: 105, 1931. 
Rather small; yellowish brown, the abdomen with a rather broad yellowish 
stripe widening at posterior margin of each tergite and rather faint sublateral 
spots; frons rather broad and parallel sided; third antennal segment with a 
rather elongate, orange, basal portion and black annulate portion; second papal 
segment distinctly swollen basally. 
Female.—Length 12-17 mm. Eye bare, green, with three narrow, diagonal, 
purple bands, the upper one not very curved. Frons yellow, about three times 
as high as basal width, with nearly parallel sides; basal callus dark brown, 
subquadrate, and nearly touching eyes; median callus a rather short, wide ob- 
long, narrowly joined to basal callus; a few black hairs at vertex but no de- 
nuded area; subcallus pale yellow, the color extending on to upper genae. 
First two antennal segments yellow, with black hair; basal portion of third 
orange, contrasting with the entirely black annulate portion; basal portion 
rather long and slender, with low dorsal angle and shallow excision; annulate 
portion, stout but pointed, slightly shorter than basal portion. Clypeus and 
lower genae white, with yellowish-white hair. Second palpal segment rather 
short, swollen at base, cream colored, with a mixture of black and cream- 
colored hair. 
Mesonotum yellowish gray, with two faint yellowish lines anteriorly and 
with yellowish prescutal lobe. Pleura and sternum gray, with yellowish-white 
hair. Wing hyaline, the costal cell pale yellow; veins yellowish brown, the 
venation normal. Legs yellowish brown, the middle and hind coxae grayish, 
base of fore femur, fore tibia apically, and fore tarsus beyond first segment 
dark brown. 
Dorsum of abdomen orange brown, darker on last three segments, with a 
median pale-yellowish stripe which widens slightly at posterior margin of 
each tergite; a blackish spot on middle of first tergite and usually another on 
middle of second tergite anteriorly ; sublaterally a row of faint yellowish-orange 
spots, each usually separated from fore and hind margin of tergite; venter yel- 
lowish brown, slightly darker posteriorly, with pale-yellowish hair. 
-Male.—Areas of large and small facets of eye sharply differentiated, the area 
of small facets not or scarcely reaching vertex along outer margin. Second 
palpal segment cream colored, with black hair, the apex acute. Coloration 
essentially as in female, the dorsal abdominal stripe broad. (The male of this 
species very closely resembles Tabanus sublongus but the median stripe is 
wider. ) 
Type.—A lectotype labelled and herein designated, one of three 
cotype females, Museum of Comparative Zoology No, 4046. 
Type locality—Illinois? No locality data on pin. 
Distribution.—Minnesota to Louisiana and Massachusetts. June 27 
(Carlisle, Pa.) to August 8 (Woodbury, Conn.). In the United States 
National Museum, four females. 
The tvpe of Atylotus baal has been studied both by the writer and 
by Philip. Originally it was the writer’s opinion that this was the 
same aS what is herein described as Zabanus sublongus, but a clean- 
ing of the type specimen of baal by Philip revealed it as 7. sagax 
without any doubt; the specimens which the writer has determined as 
Tabanus baal are really sublongus. 
