HORSE-FLIES AND WESTERN AGRICULTURE. 



21 



Front gray, a little converging; ocellar tubercle distinct: callosity nearly 

 square, with a spindle-shaped prolongation above; antennae black: third joint 

 rather narrow, its upper angle very little projecting; thorax grayish-black, 



Fig. 14. — Ventral aspect of anal segment of pupa in several species of Tabanus : 

 A, Tabanus punctifer, male; it. T. punctifer, female; C, T. insuetus, male; D, I. 

 insuetus, female: E, T. phaenops, male; /•', T. motwensis, female. 



with the usual lines very faintly marked; the antealar callosity variable, red- 

 dish or dark. The black stripe inclosed between the reddish sides of the 

 abdomen is generally rather broad, and somewhat expanded ;it the posterior 



