EXPLAIN ATIOI^ TO PLATE I. 



[In all the figures the natural flocculence of the hody is partly or entirely omitted, 

 flo as the better to show the structure. The natural sizes are also indicat^ed in hair- 

 line or hy dots within circles. ] 



Fig. 1. — SCHIZONEUKA AMERiCAJSfA : c, c, leaf showing curl — ^nat. size; a, winter 

 egg ; h, stem-mother ; d, winged female ; {, her antenna ; j, her tarsus ; e, true female, 

 ventral view, showing solitary egg; g, her tarsus, from heueath ; /, anus and genital 

 points of male ; h, antenna of 4th generation — all enlarged. 



Fig. 2. — COLOPHA ULMicoLA : a, leaf showing galls from above and beneath — ^nat. 

 size ; ft, impregnated egg surrounded by skin of true female ; c, newly-born young of 

 2d generation, ventral view ; h, its antenna ; d, pupa of same, dorsal view ; e, winged 

 female ; /, her antenna ; g, antenna of stem-mother — all enlarged. 



