Explanation of Plate HI. 



Fig. 1. — The maple-tree scale-insect, Pulvinaria innumerabilis (Rathvon), with 

 extruded egg-masses, on grape, natural size. (After Comstock.) 



Fig. 2. — The same, on osage orange and on maple. (After Walsh and Riley.) 



Fig. 3. — The same: a, a twig with mature female scales and egg-masses, natural 

 size; b, mature female scale from above, enlarged; c, female scale 

 from below, more enlarged; d, the thread-like setse of the proboscis. 

 (From the Seventh Report on the Insects of Illinois.) 



Fig. 4.— The same: a, a twig with half-grown female scales, in natural size; b, 

 autumnal female scale from above, enlarged; c, the same from beneath; 

 d, the male insect enlarged. (From the Seventh and Thirteenth 

 Illinois Reports.) 



