144 ILLINOIS BIOLOGICAL MONOGRAPHS [144 



Yerricule, n. A dense tuft of upright setae, modified from a ver- 

 ruca or seolus. (Fig. 91.) 



Verruca, n. A definitely bounded, somewhat elevated portion of the 

 cuticle, bearing several to many setae. (Fig. 88.) 



Vertical triangle, n. The thinly chitinized dorsal area bounded 

 laterad by the caudal projections of the head capsule and caudad^by the 

 prothorax. (Fig. 72.) 



