28G THE CANADIAN ENTOMOLOGIST 



July 27, '92. — Beetles are issuing in vivarium ten days after changing to pup^. 



July 30, '92. — The first beetles of this third generation are issuing out doors. On 

 some of the trees which yet have leaves there are still a considerable number of larvix; in 

 different stages of development. 



Aug. 1, '92. — Considerable numbers of beetles have issued to date, both out doors 

 and in vivarium. Larviv of all stages are still crawling about on trunk and branches. 

 Younger larvcE are still feeding on remaining leaves. Beetles are also feeding. 



Aug. 3, '92. — Beetles are issuing in large numbers, and are migrating to the trees 

 on which leaves are still present ; none to be seen on defoliated trees. There are still 

 numbers of larvse in the last two stages on some of the trees. Pupae and larvK are piled 

 up under some of the worst infested trees to the depth of about one inch. 



FOURTH GENERATION OF BEETLES. 



Aug. 3, '92. — Found to-day out doors five small batches of eggs, which will 

 produce the third generation of larvre, and are doubtless deposited by beetles of the 

 third generation. None are deposited so far in the vivarium. Large numbers of the 

 lower layers of pupK are dead and have commenced to rot, evidently on account of the 

 recent rains and excessive heat. 



Aug. 5, '92. — Beetles are swarming in large numbers, the air is full of them. 

 There are still numerous pupiv and larva^ ready to change. Numbers of larvre are still 

 feeding ; most of them are about full grown. Eggs are still rather scarce. None have 

 been deposited, so far, in the cages. There are now millions of beetles on the trees ; 

 the remaining leaves will, therefore, be soon consumed. Eggs are still scarce, though 

 batches of them are scattered over the trees: there is scarcely a chance for larva; of the 

 third generation to develop. There are still thousands of pupre and also some larvK of 

 the second generation. Eggs found August 3rd have already hatched. 



Aug 9, '92. — The majority of beetles have now issued. There are still a few 

 larva;. The denuded trees will soon have new leaves. Eggs are still scarce. Beetles 

 in cages have commenced to deposit some eggs. 



Aug. II, '92. — Nearly all beetles have issued. There are still a few larva; of 

 second generation to be seen. Eggs (third generation) have become somewhat more 

 numerous, especially on some young shoots, which are completely covered by the 

 beetles. Leaves are appearing on some of the denuded trees. 



ON DEMODEX FOLLICULORUM VAR. BOVIS IN AMERICAN 



CATTLE.—* 



BY C. W. STILES, PH. D., WASHINGTON, D, C. 



In most books which treat of D. folliculo}-um, considerable space is 

 given to a description of the lesions it produces in man, dogs, cats and 

 sheep, while its presence on cattle is simply mentioned with the remark 

 that Clans and Gros state that it is occasionally found on these animals. 



Gros seems to be the first who observed it on cattle. His original 

 article is not at my disposal, but I quote from Blanchard. 



"See page 245. 



