THE CANADIAN ENTOMOLOGIST. 285 



SECOND GENERATION OF BEETLES. 



June i8, '92. — Two beetles issued to-day from the lot in vivarium. None to be 

 found out doors so far. Apparently the last of the larvre are now descending the trees. 

 Vupx are present in heaps around base of trees. Placed a lot in breeding cage to obtain 

 beetles. 



June 20, '92. — To-day 51 beetles issued from lot in vivarium. Placed them all with 

 a branch of Elm to permit feeding and breeding. Examined the trees but failed to find 

 any of the beetles. There are still a few of the larviL feeding. 



[une 21, '92 — Noticed the first few beetles on the trees ; there are still some larvoe. 



June 22, '92. ^Beetles have become somewhat more numerous, particularly on the 

 last tree at the east entrance. Found also a few batches of recently deposited eggs. 

 Separated these in another vivarium. 



June 24, '92. — -Large numbers of beetles are issuing ; eggs are still very scarce. 

 Beetles are feeding on leaves, eating small holes. There are still a few larvae of the first 

 generation. 



lune 25, '92. — There are still a few larvit. Beetles have become cjuite numerous, 

 though eggs are still very scarce. 



June 27, '92. — Eggs are still scarce on the trees. Beetles in vivarium have deposited 

 quite a number of eggs. 



June 30, '92. — Beetles have become very numerous, and have almost ruined the 

 leaves on one tree. The majority have now issued. They do not like to oviposit on the 

 trees on which the leaves are nearly ruined, but eggs are now already quite numerous on 

 all other trees, the foliage of which, so far, is but slightly injured. 



July 2, '92.— Nearly all beetles have issued. Plenty of eggs have been deposited by 

 them on some trees, so that often 5-7 egg-masses are deposited on one leaf. On other 

 trees, on which the beetles are also plentiful, extremely few eggs can be found. 



THIRD GENERATION OF BEETLES. 



Eggs in vivaria, both those taken out doors and those obtained in breeding cage, are 

 hatching. 



July 8, '92. — A number of beetles died. No eggs deposited. 



July 15, "92. — Beetles are getting very scarce. 



July 18, '92. — Some of the larvte in cages have changed to pups, just seventeen 

 days since hatching of the eggs. 



July 19, '92. — The oldest larva; are already descending the trunk of the trees. 

 There are still a few beetles to be seen, also quite a number of unhatched eggs, some of 

 which have been but recently deposited ; also larvse in different stages, from the youngest 

 to the oldest. 



July 22, '92. — Larviia are descending the trunks by thousands; large numbers are 

 heaped up between tufts of grass, ready to change to pupa;. There are still 

 some beetles on the trees ; plenty of unhatched eggs and larvK in all stages of growth. 

 Badly infested trees look as if scorched by the sun ; leaves are dropping. 



July 26, '92. — Some trees are now almost bare of leaves, most of them having 

 dropped. Larva» of all sizes are running about on branches and trunks ; those which are 

 full-grown go to the ground to transform, all others are doomed to die of starvation. No 

 more beetles to be seen. There are already plenty of pupae and huge piles of larvse 

 around badly infested trees. 



