TABANIDA OF OHIO. 49 
TABANUS CAROLINENSIS Macquart. 
Length 12-15 mm. Eyes pilose; a small ocelligerous tubercle pre- 
sent, palpi pale, antenna reddish, annulate portion of the third seg- 
ment black or in some specimens the black of the antenna is more 
extensive, including a large part of the third segment and the superior 
angles of the first and second segments. Thorax black with obsolete 
gray stripes, thinly gray pollinose, and. clothed, especially on the sides, 
with gray pile; wings hyaline with base and costal cells pale yellowish, 
veins brown; legs “reddish brown, tarsi and apices of all the tibiae 
darker ; abdomen above brown, lighter colored on the sides, each segment 
with a gray hind margin which expands into a small triangle at the 
middle. 
Female: Subcallus denuded, shining brown or blackish, communi- 
cating with the frontal callosity which is rather small and separated 
from a linear denuded spot above it by a pollinose interval; vertex in 
the region of the ocelligerous tubercle denuded, shining brown. Eyes 
pilose, but this is rather difficult to see if not aided by a strong lense. 
Male: Subcallus not denuded; eyes plainly but short pilose ; head 
not noticeably larger than in the female. 
Habitat: Ironton, Cincinnati, Newark and Medina. 
The abdominal markings are variable and therefore hard to 
describe. The change from reddish to black is very often so grad- 
ual that it is hard to say where the one color ends and the other 
begins. The gray posterior margins of the segments are very 
narrow, and the middorsal row of triangles very small. The de- 
nuded subeallus of the female in conjunction with the hyaline 
wings is sufficient to separate it from related Ohio:species. It is 
close to rhombicus of the western states. 
1 
TABANUS CERASTES Osten Sacken. 
Length 14-16 mm. Eyes pilose, palpi pale, first two segments of the 
antenna reddish with black hairs; third segment with a very prominent 
basal process, apex of this process and annulate portion black, remainder 
reddish; thorax brown with five rather prominent gray stripes, scutellum 
uniform brown; the vestiture of the thorax and scutellum give a grayish 
appearance ; wings ‘hyaline, veins brown and costal cell smoky; legs 
brownish with the tarsi and apical part of all the tibiae darker. Abdomen 
above dark brown, with a middorsal row of gray triangles, a row of 
prominent gray spots on each side, and gray posterior margin on each 
segment. 
Female: Frontal callosity shining brown and nearly square, as 
wide as the front, and with an elongate denuded spot above it; sides of 
the front parallel. 
Male: Head noticeably larger than in the female, but the color- 
ation does not differ from that sex. 
Habitat: Hanging Rock, on the Ohio River, May 29, resf- 
ing on foliage. 
This species is very much like some others with pilose eyes, 
but both sexes are readily distinguished by the very prominent 
basal process on the third segment of the antenna. 
