42 MAINE AGRICULTURAIv EXPERIMIvNT STATION. I913. 



From the dates given above it will be seen that six or seven 

 weeks must elapse from the time of mating to the maturity of 

 the adults of the next generation so that in this region at least, 

 where we may expect killing frosts about the middle of Septem- 

 ber, there is time for but one complete generation per year. 



Fig. II. Larva. 



The fact that neither larvae nor pupae were to be found among 

 the roots or tubers after the first week in September, though 

 abundant enough in the same field in similar situations in 

 August, further substantiates this view. 



Although in this state, as far as we have been able to ascer- 

 tain, it is only the adult, which, by its leaf feeding habits, has 

 proved injurious, in New York Messrs. F. A. Sirrine and F. C. 

 Stewart have shown that the larvae are also responsible for 

 seed potato in the ground. 



Fig. 13. Epitrix aicumeris : adult flea-beetle much enlarged. 

 Bulletin U. S. Div. Entomology No. 19. 



(From 



In New York, the little larvae have been found boring into 

 the tubers, roots, and root stalks of the potato. The wound 

 made by the boring of the grub results in the formation of the 

 some injury to potatoes, namely in causing, what has been 

 termed "pimply" potatoes. So far as our own observations 

 went the past season, the larvae fed only on the fragments of 



