THE CANADIAN ENTOMOLOGIST 



inches, where it forms a small elliptical cavity about ^/le" long by ^/i' wide, 

 in which it is found curled up, probably to hibernate as a larva. These cells 

 with their contained larvae could not be found under infested trees, the majority 

 of which were growing on lawns. Captive specimens were alive and active 

 when distributed on the 12th of November, but were all dead when examined 

 in the following spring. 



Life-history and Habits of Z. abnormis Lee. 



As previously stated, this is found most abundantly on Balm of Gilead. 



Its life-history does not dififer much from that given above, though eggs 

 are laid in much larger numbers on individual leaves, as many as 50 having 

 been taken from one leaf. About 28% of the eggs under observation failed to 

 hatch for no apparent reason, and an examination of leaves under natural con- 

 ditions indicated that this sterility was normal. 



Fig. 4. Larvse of Z. scutellaris and Z. abnormis, x 10. 



The larvae are similar to those of scutellaris. The main structural dif- 

 ferences as shown in Fig. 4, which represents an almost mature larva of each 

 species. Stage II larvae of abnormis have black abdominal markings similar 

 to, though less prominent than, those of scutellaris, but from stage III onwards 

 they are entirely missing, and the larva is of a uniform yellowish-green colour. 



These larvae are more gregarious than a;"e those of scutellaris, and as many 

 as seven healthy specimens in various stages have been found feeding together 

 in one blister. 



The adults attack sheltered trees almost exclusively. The greatest damage 

 is done to foliage 6 to 10 feet from the ground, while the leaves towards the 

 centre of the tree are almost immune from attack. 



Though this beetle does not occur annually in such large numbers as does 

 scutillaris, it is far more abundant in some years on the comparatively few 



