HORSEFLIES OF THE SUBFAMILY TABANINAE 71 
gray, the fore femur black on inner side; tibiae yellowish, the apical half of 
fore tibia and tips of others blackened; tarsi dark brown to black. 
Abdomen above blackish brown, with three rows of yellowish-gray spots; 
median spots conspicuous, contiguous, and broadened abruptly at posterior 
margins, but usually narrowly separated from the conspicuous, oblique sub- 
lateral spots each of which reaches the length of the tergite; venter rather 
uniformly yellowish gray. 
Male.—Areas of large and small facets of eye sharply differentiated, the latter 
occupying lower fourth and a very narrow margin around outside. Colora- 
tion essentially as in female. 
Described from a specimen collected by J. M. Aldrich at Galveston, 
Tex., June 10, 1917. 
Type.—Female, in the collection of Ohio State University. 
Type locality.—Galveston, Tex. 
Distribution.—Coastal region of Texas. May 31 (Humble) to Sep- 
tember 19 (Brownsville). In the United States National Museum, 
five females, one male. 
FicurRE 24.—Antenna, front view of head, and palpus of (4) Tabanus teranus and (B) 
T. longiusculus. 
TABANUS LONGIUSCULUS Hine 
(Fig. 24, B) 
Tabanus longiusculus Hine, Ohio Nat. 8: 226, 1907; Philip, Ohio Jour. Sci. 36: 
151-152, 1936. 
Small; dark brownish, the abdomen with a narrow, median, gray stripe 
widened at posterior margins of tergites, and isolated sublateral spots; costal 
cell considerably yellowed; annulate portion of third antennal segment black; 
mesonotum dark, with rather distinct pollinose lines; frons parallel sided. 
Female.—Length 11-18 mm. Eye bare, green, with two diagonal purple 
stripes and a triangular purple spot above, the base of latter on frons. Frons 
yellowish tinged with orange at vertex and at level of median callus, four to 
four and one-half times as high as width across basal callus, slightly widened 
above; basal callus orange brown, vertical and nearly touching eyes; median 
callus usually slightly darker, about half width of frons and usually joined to 
basal callus by a line; subcallus and upper genae concolorous with frons. First 
two antennal segments yellowish brown, with black hair; third orange, the 
annulate portion black, the basal portion rather stout, the dorsal angle prom- 
inent but not acute, the dorsal excision slight; annulate portion stout, slightly 
shorter than basal portion. Clypeus and lower genae pale gray, with white 
hair. Second palpal segment cream colored, with black and white hair, rather 
stout at base, but tapering to a slender apex. 
Mesonotum blackish, the prescutal lobe and the stripes in usual pattern 
brownish. Pleura, sternum, and coxae gray, with white hair. Wing hyaline, 
the costal cell rather intensely yellow; venation normal. Legs generally yel- 
lowish brown, the fore femur, apices of tibiae, and the tarsi usually darker 
brown. 
Abdomen above dark brown, somewhat lighter laterally, with light-brownish- 
gray markings consisting of a slender median line widening at the posterior 
margin of each tergite to form a narrow border, and round, isolated, sublateral 
spots on tergites 1-5 or 1-6, only the spot on tergite 1 touching the hind margin ; 
venter reddish brown, blackened apically. 
Male—Eye with areas of large and small facets moderately. well differen- 
tiated, the former covering slightly more than half the eye; second palpal seg- 
