HORSEFLIES OF THE SUBFAMILY TABANINAE 79 
vein R.z without a stump vein; cell Rs somewhat narrowed at margin. Legs 
generally brown or blackish, the tibiae paler; hind tibial fringe dark, distinct. 
Abdomen above dark brown to black; first tergite with a small, median, white 
spot; tergites 2-6 with median white triangles, widest on third tergite, smaller 
posteriorly ; sublateral row of rather faint, round, pale spots on tergites 3-6; 
_ venter brownish gray, with whitish incisures and usually with a broad, darker- 
brown, median stripe. 
Male.—Facets of upper two-thirds of eye scarcely larger than those cf lower 
third, the line of differentiation not marked; a dark diagonal stripe present. 
Lower clypeus and genae with dark-brown pollen and pile. Palpus, thorax, and 
legs nearly black. Pale stripes of mesoscutum confined to anterior margin; 
secutellum and a distinct spot on postalar lobe with white pollen and pile. 
First tergite black, second with a narrow, posterior, pale band nearly uniform 
in width, third and fourth mostly white, with four dark spots joined together 
along anterior margin, fifth with three pale spots, sixth usually with some 
pale markings; venter dark brown, with a row of pale spots on each side of the 
broad, median, dark stripe. 
Type.—The female herein designated as lectotype from a cotype 
pair in the Museum of Comparative Zoology (No. 4038). 
Type locality —Dallas, Tex. 
Distribution—From Iowa to Ohio and south to Texas and Louis- 
jana. May 19 (Victoria, Tex.) to September 1 (Opelousas, La.). In 
the United States National Museum, 22 females, 2 males. 
TABANUS JOHNSONI Hine 
(Fig. 28, B) 
Tabanus johnsoni Hine, Ohio Nat. 8: 225, 1907. 
Medium sized; orange brown, the abdomen with a median row of contiguous 
yellowish-brown triangles and very faint sublateral spots; wing orange brown, 
spotted with brownish. 
Female.—Length 16-20 mm. Eye bare. Head yellowish brown, paler below. 
Frons a little over four times as high as width across basal eallus, slightly 
widened above; basal callus higher than wide, nearly touching eyes, orange 
brown; median callus a slender brown streak very narrowly joined to the basal 
eallus. Antenna uniformly yellow brown, the first two segments with black 
hair; third with a prominent, slightly acute, dorsal angle, the dorsal excision 
very strong; annulate portion slightly shorter than basal portion. Hair of head 
and most of body yellow. Second palpal segment of moderate length and 
thickness, with short black hair. 
Thorax yellow brown, slightly darker above, with indications of faint longi- 
tudinal lines; some black hair on prescutal lobes; wing tinged with yellow 
brown, with costal cell stronger yellow and with distinct brown spots at furea- 
tion and cross veins. Legs rather uniformly yellowish brown, with concolorous 
hair. 
Abdomen somewhat orange brown, with darker markings above, which set 
off three rows of paler spots; the median row of triangles forming a continuous 
stripe, widening at each segment posteriorly; sublateral spots less distinct; 
venter orange brown tinged with black. 
Male—Unknown. 
Cotypes.—In the collection of Ohio State University and in the 
Museum of Comparative Zoology. 
Type locality —St. Augustine, Fla. 
Distribution.—Eastern Florida from St. Augustine to Homestead 
and Paradise Key. May 17 (Zellwood) to September 8 (Home- 
stead). In the United States National Museum, 19 females. 
This is very close to acutus (Bigot), but in acutus the median 
abdominal stripe is parallel sided, the abdomen is slightly more 
slender, the palpus is slightly longer, and the dorsal angle of the 
third antennal segment projects forward slightly. 
