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 punetifer, male; B, T. punctifer, female; G, T. insuetus, male; D, T. 

 insuetus, female ; E, T. ph-aenopu, male ; F, T. monoensis, 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 at the posterior 



