INSECTS AFFECTING PARK AND WOODLAND TREES 



645 



in^;' from rosy to a pale tliiii^A' color. I he L^cncral form and sirucliire 

 is shown at I'li^rurc 178 The youm^ of ihc stem mother or tlie second 

 generation attain maturit\' earl\- in |iil\' ami comnn-nce lea\in^' the galls, 

 continuing to issue till late in the fall. The)' migrate to hirches where 

 the\' settle on the k^ax'es and each female protluces from y^ to 40 or more 

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



\^ 



Fii'.. 181 H :i III .1 ti) <.- I i s t e s s p i 11 <■ ;* n >, 4lh yvnc-ra- 

 tioii : ii - yiniii^ larvii, ilorsal view ; /' ■ vcntr:il view ; 



f—anleniia; (/^eyc ; ^— adult (cniale, dorsal view; Fig. 182 |-l a m .1 m c 1 i s t c s s p i 11 o s u s: p&cudof;alls 



y^ ventral view ; jp- antennn, much cnlarRcd (After or corriigaiioiis on birch leaves, natural size CAfier 



Pcri;aiide, I'. S. Dep't Aktic. I>iv. Ent. Tech. Scr. Pcr^andc, L". S. Dep't Acric. Div. Ent, Tech. Scr. u. 



9, iQfjr 1 1901 > 



)oung of a L(xanium I fig. 179I. The recently hatched young are redilish 

 brown, with pale \ello\v legs and antennae and pur|)lish eyes. They soon 

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

 oval, deep black, coincx | tig. iSo|. This insect hibernates on tiie birch 

 twigs, becoming co\ered with a wa.\y secretion. .\cti\ it\ is resumetl the 

 middle oT .\pril. when the females become full grown and ])i-otluce \oung, 

 the fourth generation. These latter are remarkable insects with their 



