INSECTS AFFECTING PARK AND WOODLAND TREES 



645 



inor from rosy to a pale dini;\' color. The m.-iicral form ami structure 

 is shown at fii^ure 178 The nouhl; ot the stem mother or the second 

 generation attain maturit\c.irl\ in |ul\- and commence leaving the galls, 

 continuing to issue till late in the fall. They migrate to birches where 

 they settle on the leaves and each female produces from 30 to 40 or more 

 young. This, the third generation, is peculiar in its resemblance to the 



Fig. iSi H a 111 ;i m c I i s t e s s p i ii » s 

 tioii: a=-youiigl.irva, dorsal view ; iS— ventral view 

 r=antenna; (/=eye ; r^adult female, dorsal view 

 y=ventral view ; £=antenna, much enlarged (Aflc 

 Pergaiide, U. S. Dep't Agric. Div. Ent. Tech. .So! 

 9, 1901) 



Fig. 182 H a m a m e 1 i s t e s s p i n o s u s: pseudogalls 

 or corrugations on birch leaves, natural size (After 

 Pergande, V..S. Dep't Agric. Div. Em. Tech. Ser. 9, 

 igoi) 



young of a Lecanium [fig. 179]. The recently hatched young are reddish 

 brown, with pale yellow legs and antennae and purplish eyes. They soon 

 change to a brilliant dark metallic blue green. The adult female is broadly 

 oval, deep black, conve.x [tig. 180]. This insect hibernates on the birch 

 twigs, becoming covered with a wa.\y secretion. .Activity is resumed the 

 middle of April, when the femak-s become full grown and produce \oung, 

 the fourth (generation. These latter are remarkable insects with their 



