56 OHIO STATE ACADEMY OF SCIENCE. 



TABANUS VARiEGATus Fabricius. 



Length 20-23 mm. This species is much like sulcifrons, but the 

 gray triangles in the middle of the abdominal segments are smaller 

 than in that species and the disk of the wings, at least in the female, 

 have a suggestion of whitish. 



Female: Gray triangles of the abdomen prominent, those on the 

 second and third and sometimes the fourth segments preceeded by a 

 black mark, a blackish marking at the lateral margin of each abdominal 

 segment and last two or three segments largely dark. 



Male : What is most probably the male of this species as it was 

 taken in the same locality with the females may be described as follows : 

 colored much like the female and therefore mUch like sulcifrons, but the 

 middorsal row of triangles are very small and preceded by black markings 

 on the second, third and fourth segments; cross veins at the apex of 

 the discal cell, and the bifurcation of the third vein narrowly margined 

 with brown; the facets of the eyes nearly uniform in size, those on the 

 disk of the eye are slightly larger than at the margin but the difference 

 is no where near as striking as in the male of sulcifrons. 



Habitat : Central Ohio. 



TABANUS VENUSTUS Ostcn Sackcn. 



Length 13-15 mm. Antennae and palpi brownish, thorax with white 

 stripes and brown intervals, scutellum uniformly whitish poUinose; wings 

 variegated with brown and hyaline as follows : base hyaline as far out 

 as the humeral cross vein, beyond this a brown band extending from 

 costa to posterior margin and occupying about half of the anal cell, then 

 follows a shorter band partially confluent with the former and surround- 

 ing the cross veins which close the basal cells, the brown apex of the 

 marginal cell is confluent across the first submarginal with the prominent 

 brown spot at the bifurcation of the third vein, the transverse veins 

 closing the discal cell are broadly margined and a lighter brown space 

 follows the posterior border of the wing to its apex where it unites with 

 the darker brown in that region.; 



Female : The posterior margins of the abdominal segments above 

 are gray and expand into prominent triangles in the middle of segments 

 two, three and four. In the middle of the venter is a wide brown stripe 

 bordered on each side by lighter. 



Male : This sex is like the other except the dorsal markings of the 

 abdominal segments are expanded laterally and give the appearance of 

 wide posterior margins. 



Habitat: Cincinnati, Ohio, June 25. 



Taken by Mr. Charles Dury, who has donated a male and 

 female to the University collection. 



This is the only species of Tabanus in our fauna with the 

 wings variegated on basal half. 



tabAnus vivax Osten Sacken. 



Length 14-16- mm. Slightly elongate, antennae black, first segment- 

 partially reddish especially in the female, face clothed with gray hair's 

 atw!" pollen, the latter having a yellowish tinge; thorax with five-gray stripes 

 separated by black, scutellum uniformly black with _ gray hairs on the 



