54 OHIO STATE ACADEMY OF SCIENCE. 



TABANUS REiNWARDTii Weidemanti. 



Length 14-19 mm. Eyes pilose, palpi pale yellowish, antennae 

 black, sometimes first segment reddish; thorax brownish, thickly clothed 

 with rather long gray hairs, above with white stripes; legs largely dark 

 colored but the basal part of all the tibiae yellowish, this color is least 

 extensive on the anterior pair ; wings hyaline with the cross veins and 

 bifurcation of the third vein margined with brown ; abdomen with a 

 middorsal row of prominent gray triangles and on either side of this 

 a row of oblique gray spots which connect with the narrow gray hind 

 margins of the segments. 



Female: Frontal callosity shining black, scarcely as wide as the, 

 front, slightly higher than wide and with a linear prolongation above; 

 sides of the front parallel. 



Male: Thorax more thickly pilose than in the female, head only 

 slightly larger, eyes very distinctly pilose. 



Habitat : Cincinnati and Medina. 



TABANUS STYGIUS Say. 



Length 20-22 mm. Third segment of the antennae red at base, 

 blackish at apex, first and second segments and palpi dark; legs black, 

 often the tibiae reddish at base ; wings yellowish brown with the posterior 

 border approaching hyaline, a brown spot on the bifurcation of the third 

 vein, also the transverse vein closing the discal cell margined with 

 brownish ; abdomen uniform black. 



Female : Thorax dorsally plainly whitish pollinose with more in- 

 tense longitudinal lines. 



Male : Thorax dorsally uniform grayish brown in well preserved 

 specimens. 



Habitat : Sandusky, Wauseon and Cincinnati. 



It is closely related to nigrescens, but in the specimens before 

 me the wings have more color on the anterior part than in that 

 species. In nigrescens the dorsum of the thorax is shining black, 

 thinly whitish pollinose on anterior fourth in both sexes, there- 

 fore the difference in color in this region is distinctive when 

 dealing with perfect specimens. However, the males are very 

 close at best, and easily confused. 



It resembles pimctifer somewhat, but this species has the 

 front tibia white on basal third and the thorax uniformly white 

 in both sexes. 



The females oviposit on Sagittaria growing in shallow water 

 at Sandusky, and on a previous page I have fully described this 

 process. 



TABANUS SULCIFRONS Macquart. 



Length 18-21 mm. Palpi brownish, antennae nearly black with the 

 third segment brownish at base; legs dark, bases of tibiae darker; 

 wings with a distinct brownish tinge, cross veins at the end of the 

 discal cell and bifurcation of the third vein margined with brown. 



