HORSEFLIES OF THE SUBFAMILY TABANINAE 105 
Mesoscutum and scutellum reddish brown, the former with faint lines of 
grayish pollen and pile; prescutal lobe with dense black hair. Pleura paler 
with a mixture of whitish and black hair. Wing hyaline, with costal cell and 
stigma yellowish brown, a faint brownish tinge along anterior longitudinal 
veins and cross veins, and a rather distinct spot at furcation; vein R:z with a 
short stump; cell Rs nearly or quite closed, or sometimes slightly petiolate. 
Coxae gray; rest of legs black except for white on basal half of fore tibia 
and slightly more, basally, on middle and hind tibiae. 
Dorsum of abdomen nearly black, with a distinct row of median white tri- 
angles on tergites 1-6, and narrow bands on hind margins, widening laterally; 
venter dark reddish to black, with rather wide bands on hind margins of 
sternites. 
Male—Areas of large and small facets of eye sharply differentiated, the 
former extensive; second palpal segment stout, creamy white, with black hair 
apically. White on fore tibia reduced to basal third; cell R:; only slightly 
narrowed. Rest of coloration essentially as in female. 
Described from a single male in the Cornell University Collection 
from Billy’s Island, Okefenokee Swamp, Ga., July 1912, with two 
females bearing the same data. 
Type.—Female, United States National Museum No. 50616. Para- 
types, United States National Museum No. 50616. 
Type locality —Lakeland, Fla. 
Distribution—Georgia and Florida. May 30 (St. Cloud, Fla.) 
to June 14 (Sebring, Fla.). In the United States National Museum, 
12 females. 
TABANUS PETIOLATUS Hine 
(Fig. 48, 4) 
Tabanus petiolatus Hine, Ohio Jour. Sci. 17: 270, 1917. 
Medium sized; brown, with a median row of prominent white triangles on 
abdomen; fore tibia bicolored; hind tibia nearly uniformly yellowish brown; 
cell Rs closed and usually petiolate. 
Ficurp 48.—Antenna, front view of head, and palpus of (A) Tabanus petiolatus and 
(B) T. melanocerus. 
Female.—Length 15-17 mm. Eye bare. Frons yellow, tinged with gray 
at vertex, about seven times as high as width at base and somewhat widened 
above; basal callus dark brown, narrowly separated from eyes and about twice 
as high as wide; median callus a slender, concolorous line reaching slightly 
above middle of frons; subcallus and upper genae yellowish. Antenna nearly 
black, except extreme base of third segment, which is reddish orange; first 
two segments with black hair; basal portion of third rather stout, with a dis- 
tinct dorsal angle and moderate excision; annulate portion about as long as 
width of basal portion. Clypeus and lower genae white, with white hair. 
Palpus creamy white, with a mixture of concolorous and black hair, the second 
segment moderately stout at base and tapering to a slender apex. 
Mesonotum dark grayish, with reddish-brown longitudinal stripes in usual 
pattern and prescutal lobe and hind margin of scutellum_ reddish brown. 
Pleura, sternum, and coxae grayish, with mostly white hair. Wing subhyaline, 
with cell R; closed and usually petiolate, and occasionally a very small stump 
