726 



REPORT UNITED STATES GEOLOGICAL SURVEY. 



her eggs in patches from time to time, covering a period of about forty 

 days; and also from the fact that among, those larvse, vrhich all hatch 

 out in one day, some will develop and become beetles in a week and 

 even ten days earlier than others. Thus it may be that some of the late 

 individuals of the third brood pass the winter in the pupa state, though 

 the normal habit is to transform to beetles. Each female is capable of 

 depositing upward of a thousand eggs before she becomes barren, and 

 in from thirty to forty days from the time they were deposited they will 

 have produced perfect beetles. These beetles are again capable of de- 



positnig eggs, in abt ai two weeks altti i^^huuig tiom the ground, and 

 thus m about nfty days atter the egg is laid rhe oltspriug begius to 

 propagate. The pupaVif tlie Colorado potato-beetle is represented at 

 Fig.—. It is formed in a little cavity which the larva had made per- 

 fectly smooth and hard, and it is of the same color as the larva. The 

 beetle on first emerging from it is quite pale and soft, without any mark- 

 ings whatever." 



