124 CHEEMES HIMALATENSIS ON THE SPEUCE AND SILVEE FIE. 



Plate 23. 



Fig. 1. Branch of Silver Fir showing the peculiar corkscrew masses into which the upper portions 

 of the new.shoots of the year are twisted by Chermes himalayensis. June 24th, 1909. 



2. Young grubs on the cortex of young branches of Silver Fir, hatched from the eggs laid by 



the corkscrew generation of apterous females. July 18th. 



3. The same, more highly magnified, showing the enormously long proboscides inserted through a 



crevice into the cambium layer. 



4. Portion of the bark of the main stem of a Silver Fir sapling, showing the cottony egg-masses 



adhering to the bark as seen iu the early spring before the hatching out of the first larvae 

 of the year. 



