56 OHIO STATE ACADEMY OF SCIENCE. 
TABANUS VARIEGATUS Fabricius. 
Length 20-23 mm. This species is much like sulcifrons, but the 
gray triangles in the middle of the abdominal segments are smaller 
than in that species and the disk of the wings, at least in the female, 
have a suggestion of whitish. 
Female: Gray triangles of the abdomen prominent, those on the 
second and. third and sometimes the fourth segments preceeded by a 
black mark, a blackish marking at the lateral margin of each abdominal 
segment and last two or three segments largely dark. 
Male: What is most probably the male of this species as it was 
taken in the same locality with the females may be described as follows: 
colored much like the female and therefore much like sulcifrons, but the 
middorsal row of triangles are very small and preceded by black markings 
on the second, third and fourth segments; cross veins at the apex of 
the discal cell, and the bifurcation of the third vein narrowly margined 
with brown; the facets of the eyes nearly uniform in size, those on the 
disk of the eye are slightly larger than at the margin but the difference 
is no where near as striking as in the male of sulcifrons. 
Habitat: Central Ohio. 
TABANUS VENUSTUS Osten Sacken. 
Length 13-15 mm. Antennae and palpi brownish, thorax with white 
stripes and brown intervals, scutellum uniformly whitish pollinose; wings 
variegated with brown and hyaline as follows: base hyaline as far out ~ 
as the humeral cross vein, beyond this a brown band extending from 
costa to posterior margin and occupying about half of the anal cell, then 
follows a shorter band partially confluent with the former and surround— 
ing the cross veins which close the basal cells, the brown apex of the 
marginal cell is confluent across the first submarginal with the prominent 
brown spot at the bifurcation of the third vein, the transverse veins 
closing the discal cell are broadly margined and a lighter brown space 
follows the posterior border of the wing to its apex where it unites with 
the darker brown in that region. 
Female: The posterior margins of the abdominal segments above 
are gray and expand into prominent triangles in the middle of segments 
two, three and four. In the middle of the venter is a wide brown stripe 
bordered on each side by lighter. 
Male: This sex is like the other except the dorsal markings of the 
abdominal segments are expanded laterally and give the appearance of 
wide posterior margins. 
Habitat: Cincinnati, Ohio, June 25. 
Taken by Mr. Charles Dury, who has donated a male and 
female to the University collection. 
This is the only species of Tabanus in our fauna with the 
wings variegated on basal half. 
TABANUS VIVAX Osten Sacken. 
Length 14-16 mm. Slightly elongate, antennae black, first segment 
partially reddish especially in the female, face clothed with gray hairs 
and pollen, the latter having a yellowish tinge ; thorax with five gray stripes 
separated by black, scutellum uniformly black with gray hairs on the 
