52 OHIO STATK ACADEMY OF SCIENCE. 
Habitat: Common all over Ohio. 
This and costalis are near together in size, but the hyaline 
costal cell and gray striped thorax distinguish limeola. It is an 
annoying pest during the first part of the summer. 
TABANUS LONGUS Osten Sacken. 
Length 14-15 mm. General color brownish, form somewhat elon- 
gate; palpi white with short hairs, part of which appear bla¢k; antennae 
reddish, third segment black on apical part; thorax brownish with faint 
grayish stripes, wings hyaline, legs brownish, tibiae especially the last 
four segments darker; abdomen above brown with narrow, gray hind 
borders to the segments; a row of faint elongate spots on the middorsal 
line, these form a continuous row and therefore take on the appearance 
of a stripe, each of the first five or six segments of the abdomen have 
on either side a small somewhat oblique spot which does not touch 
either margin. 
Female: Front slightly wider above, clothed with grayish yellow 
pollen; frontal callosity nearly square, dark brown, and either united 
or separated from a shining spot which lies above it and which appears 
to be the upper part of the linear prolongation seen in many species. 
Male: Like the female except in sexual characteristics. 
Habitat: Medina, Ohio, where it is common and often ob- 
served on horses. 
TABANUS NIvOSUS Osten Sacken. 
Length 12-14 mm. Palpi pale yellow, antennae black, five narrow 
gray stripes on the anterior part of the thorax, these are obsolete behind, 
wings hyaline with brown veins, legs black, tibiae more or less reddish; 
abdominal segments above with very narrow gray hind borders which 
expand into small gray triangles in the middle, prominent gray markings 
on the sides of the segments, these markings get smaller gradually from 
before backwards, and outwardly from them on each side is a row of 
black spots which vary in size in different specimens. 
Female: Sides of the front parallel, frontal callosity brown, nearly 
as wide as the front, and above with a linear prolongation which reaches 
half way to the vertex. 
Male: The two sexes are easily associated but the male usually 
has most gray on the abdomen. 
Habitat: Sandusky, where it is common. 
This species resembles vivax somewhat, but the pale yellow 
palpi in both sexes, the parallel sides to the front in the female 
and the lack of prominent gray stripes on the thorax are char- 
acteristic of nivosus. It appears to be partial to stagnant water, 
while vivax breeds in swift flowing streams. It is one of the 
Ohio species which readily attacks man, and is somewhat of an 
annoyance at the bathing beach, following out over the water as 
far as one is pleased to go. : 
