82 



MISCELLANEOUS PAPERS. 



Adult 20 to 22 mm. in length. Third segment of the antenna reddish at the base, 

 blackish at the apex; legs black, the front tibise reddish at base; wings yellowish 

 brown, cross veins and furcation of the third vein margined with darker; abdomen 

 uniformly black. Female, thorax plainly white pollinose; male, thorax uniformly 

 grayish brown. 



The species is nearly related to T. nigi^escens^ which has the thorax 

 of the female almost uniformly black. 



THE RIVER HORSEFLY. 



{Tabanuii vira.r Osten Sacken. ) 



1 have never observed this species to be especially common, but it 

 is widely distributed, having been taken in a numl)er of the Eastern 



Fig. S.— Tabanus vivax: a, male; B, female; c, pupa; D, terminal abdominal 

 teeth of pupa; e, larva. All enlarged (original). 



States. Since specimens are not plentiful they are not often observed 

 around stock, but it is known that the}^ have the same habits in this 

 regard as the other members of the family. The male has been taken 

 fully as often as the female, on protruding stones in swift-flowing 

 streams, and in sunny spots in woods near such streams. The species 

 is on the wing during the last half of J une. 



Adult (fig. 8, .\, b) from 14 to 16 mm. in length, slightly elongate; antenna? black, 

 first segment partially reddish in the female; thorax with five gray stripes separated 

 by black; wings hyaline; legs black in general color, with the basal part of each 

 tibia yellowish; abdomen with a prominent middorsal row of gray triangles and gray 

 spots on each side. 



