TABANIDA OF OHIO, 51 
TABANUS GIGANTEUS Degeer. 
Length 22-25 mm. Palpi pale, atennae reddish; thorax reddish 
brown with some darker stripes, and thinly clothed with gray pollen, 
scutellum dark at base reddish at apex, wings uniformly reddish brown, 
legs reddish with tarsi darker than the other parts; abdomen above dark 
brown, approaching black with gray hind margins to the segments. 
Female: Front quite narrow, yellowish pollinose; frontal callosity 
shining brown, not quite as wide as the front below, gradually narrowed 
on upper half and extending above into a linear prolongation which reaches 
more than half way to the vertex. 
Male: Colored like the female, head rather small; eyes composed 
of large and small facets but the difference in size not so great as in 
most other species. 
Habitat: Wauseon, London, Newark and Cincinnati. 
The species occurs late in the season, and I have never found 
it abundant, though it appears to be widely distributed. Its color 
and large size easily separate it from all North American species 
except americanus, and that species has hyaline wings with the 
costal cell dark brown. 
TABANUS LASIOPHTHALMUS Macquart. 
Length 13-15 mm. Eyes pilose, ocelligerous tubercle present, thorax 
black with narrow gray stripes which are not prominent; wings hyaline, 
cross veins and bifurcation of the third vein margined with brown. 
Abdomen broadly reddish on the sides. 
Female: Subcallus denuded, shining black; frontal callosity also 
shining black, as wide as the front, and separated from a denuded spot 
above by a pollinose interval; front slightly widened above. 
Male: Subcallus not denuded, eyes very plainly pilose, head about 
equal in size to that of the female. 
Habitat: Common in all parts of the state from May 15 
to June 15. 
Very easily recognized by its pilose eyes in connection with 
the denuded subcallus and brown margins to the cross veins and 
bifurcation of the third vein. 
TABANUS LINEOLA Fabricius. 
Length 12-15 mm. Palpi white, antennae reddish, annulate portion 
of third segment darker; thorax brown and gray striped, the latter color 
not prominent; wings hyaline; legs reddish, apex of the front tibia 
plainly, apexes of middle and hind tibiae faintly, and all of the, tarsi 
‘dark brown; eu Oe above brown or black with three Drominent, gray 
‘stripes. ~-- ees} 
he The Fale: and onan aa this. species are feaeily Soa He We In 
the. latter sex there, is sometimes a;confusion, of colors; the ,dark, is 
replaced by reddish but the gray middorsal stripe is always prominent 
in all well preserved specimens. 
