HORSEFLIES OF THE SUBFAMILY TABANINAE 75 
TABANUS LONGUS Osten Sacken 
(Fig. 26, B) 
Tabanus longus Osten Sacken, Mem. Boston Soc. Nat. Hist. 2 (pt. 4, No. 4, and 
sup.) : 447-448, 559, 1876-78; Hine, Ohio Nat. 14: 227-228, 1914; Fairchild, 
Boston Soc, Nat. Hist. Occas. Papers 8: 140, 1934; Philip, Ohio Jour. Sci. 
36: 149, 1936. 
Rather small; brownish, the abdomen with three rows of small grayish spots, 
the sublateral spots not touching hind margins of tergites; frons parallel sided; 
third antennal segment rather slender, with basal portion orange, annulate 
portion black. 
Female.—Length 13-15 mm. Eye bare. Frons yellowish brown, about three 
and one-half times as high as wide, with nearly parallel sides; basal callus sub- 
quadrate, yellowish to dark brown; median callus small, narrowly joined to 
basal callus; subcallus and upper genae concolorous with frons. Antenna 
mostly orange, the first two segments with black hair, the first not enlarged; 
third slender, the dorsal angle obtuse and rounded and excision shallow; an- 
nulate pertion black in contrast to basal portion. Clypeus and lower genae 
light gray, with white hair. Palpus short, moderate in thickness, and only 
Slightly tapered, with a mixture of black and white hair. 
Mesonotum dark brown, with a mixture of black and white hair; prescutal 
lobe yellowish brown, with black hair. Pleura, sternum, and coxae gray, with 
white hair. Wing hyaline; venation normal. Legs yellowish brown, the fore 
tibia and all tarsi somewhat darkened. 
Abdomen dark brown above, with a median row of slender, evanescent, whit- 
ish spots widened at posterior margins, and sublateral, oblique spots of same 
color not touching posterior margins; venter grayish brown. 
Male.—Unknown. 
Type.—One of the two cotype females, Museum of Comparative 
Zoology No. 4043, labelled and herein designated as lectotype. 
Type locality—Middle Atlantic States. 
Distribution.—Pennsylvania and North Carolina to Oklahoma. 
August 19 (Plummers Island, Md.) to October 9 (Yell County, Ark.). 
In the United States National Museum, three females. 
This species is apparently an uncommon one, many of the speci- 
mens determined as longus at various times being sackeni or sub- 
longus. I have not seen enough specimens of /ongus to feel sure of 
its limits; and it is possible that, as Philip has pointed out in connec- 
tion with the Arkansas specimens, there may be more species still 
to be recognized in the longus group. 
TABANUS PUMILUS Macquart 
(Fig. 27, 4) 
Tabanus pumilus Macquart, Diptéres exotiques nouveaux ou peu connus, v. 1, 
pt. 1, pp. 146-147, 18388; Osten Sacken, Mem. Boston Soe. Nat. Hist. 
2 (pt. 4, No. 4): 448, 1876; Hine, Ohio State Acad. Sci. Spee. Papers 5: 
53, 1903; La. Agr. Expt. Sta. Bull. 98: 54-55, 1907. 
Small; blackish, with a row of narrow, pale, median triangles on abdomen 
and small, round, sublateral spots; median callus nearly square; third an- 
tennal segment with a distinct dorsal angle; second palpal segment not strongly 
swollen basally and not tapering to a sharp apex. 
Female.—Length 9-11 mm. Eye bare, deep purple, with two rather broad 
green-blue bands. Frons gray tinged with yellow, four and one-half to five 
times as high as width at basal callus, the width at basal callus six-tenths of 
width at vertex; basal callus shiny black, square or slightly higher than wide, 
and either separated from median callus or joined to it by a narrow black 
line; median callus as large as or larger than basal callus, shiny black, but 
with a roughened surface; vertex usually with a flat, black, denuded spot 
about one-third width of vertex and slightly higher than wide; subcallus and 
upper genae yellow brown. Antenna orange, the annulate portion sometimes 
darker: first two segments with black hair; basal portion of third broad and 
