TABANID^ OF OHIO. 5I 



TABANUS GIGANTEUS Dcgeer. 



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 : Watiseon, 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 wihite, 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; abdomen above brown or black with tliree prominent, gray 

 stripes. ' 



The males and females of this species are easily associated. 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. 



