TABANIDAX OF OHIO. BOD 35 
Habitat: Sandusky, Ohio. Many specimens of both sexes. 
The species is separated from flavidus by the following: The 
antenne are longer and have the first two segments thicker and 
the third colored differently at base. The basal cells are more 
infuscated, the apical spot less clearly defined and the abdomen 
more uniformly colored. In flavidus the abdomen is distinctly 
lighter in color at base, but not so in brunneus. The former ap- 
pears to be southern in its range, while the latter is probably 
northern. 
Osten Sacken’s description of the abdomen and apex of the 
wing under flazidus would seem to indicate that he had both 
species before him. 
The species is abundant at Sandusky from the latter part of 
June to the first of August, and is an annoying pest in the vicinity 
of the marshes. It is abundant at any time of day, but appears 
to be most numerous and persistent in the evening, and its at- 
tacks are prolonged till almost dark in warm weather. 
CHRYSOPS CALLIDUS Osten Sacken. 
Length 7-9 mm. The width of the apical spot is equal to the dis- 
tance between the costa and the second vein at the distal end of the 
first vein. First two segments of the abdomen ‘yellow on the sides and 
this color on the second is not encroached upon by a black triangle. 
Basal half or more of the venter of the abdomen plainly yellowish but 
with a dark stripe or some dark spots on the mid ventral line. 
Female: Frontal callosity black; facial callosity yellow; both, basal 
cells hyaline; dorsally the abdominal segments with narrow, yellow hind 
margins which expand into triangles in the middle, none of these triangles 
extend forward far enough to entirely divide the black of any of the 
segments. Lateral margins of the segments behind the third black. 
Male: Both basal cells with about the apical third hyaline; the 
yellow on the sides of the first two abdominal segments is more promi— 
nent and the posterior margins of all the segments wider than in the 
male of moerens. 
sHlahitat: All. parts of Glico. 
It is exceedingly common all over Ohio during the latter half 
of May and first half of June, and the females have often been 
observed attacking horses and cattle. The eggs are laid on foliage 
over water along ‘the margins of ponds and canals; on a previous 
page in this paper we have described the eggs and the process of 
oviposition. The males have been taken on flowers and swept 
from vegetation growing near water.’- Although the species 
is most abundant during the months I have mentioned above, 
now and then.a specimen is seen later, and last summer specimens 
were procured 2 as lateas August 28th, in the northern part 2 the 
State tees ai 
