The B:ology of Maine Species of Altica. 185 



5 hatched in 8 days, 5 in 9 days, 5 in 10 days, 8 in 11 days, 7 

 in 12 days, 6 in 13 days, 9 in 15 days, and 1 in 19 days; average 12 days. 

 Length of the first larval instar. A record which was kept 

 of 71 larvae which hatched between June 22 and July 31 in- 

 clusive, may be tabulated as follows : 



8 molted to the second instar in 5 days after hatching from the 

 egg, 16 in 6 days, 20 in 7 days, 13 in 8 days, 11 in 9 days, 1 in 10 days, 

 1 in 11 days, and 1 in 12 days; average 7 days. 



Length of the second larval instar. A record which was 

 kept of 80 larvae which molted to the second instar between 

 June 28 and August 8 inclusive, may be tabulated as follows : 



2 molted to the third instar in 3 days after the first molt, 11 in 4 

 days, 32 in 5 days, 25 in 6 days, 6 in 7 days, and 4 in 8 days ; average 



5 days. 



Length of the third larval instar. A record which was kept 

 of 68 larvae which molted to the third instar between July 4 

 and August 8 inclusive, may be tabulated as follows : 



5 entered soil in 4 days after the second molt, 17 in 5 days, 23 in 



6 days, 12 in 7 days, 3 in 8 days, 1 in 9 days, 5 in 10 days, 1 in 11 days, 

 and 1 in 12 days ; average 6 days. 



Length of the prepnpal period. A record which was kept 

 of 60 prepupae which entered the soil between July 14 and 

 August 15 inclusive, may be tabulated as follows: 



1 transformed to the pupal stage in 3 days after entering soil, 9 

 in 4 days, 23 in 5 days, 19 in 6 days, 4 in 7 days, 1 in 8 days, and 3 in 

 10 days ; average 5 days. 



Length of the pupal period. A record which was kept of 

 44 pupae which transformed between July 22 and August 22 

 inclusive, may be tabulated as follows : 



2 emerged as adults in 6 days after the pupal molt, 10 in 7 days, 

 18 in 8 days, 10 in 9 days, and 4 in 10 days ; average 8 days. 



Typical life history. The following is cited as a typical life history: 

 6 eggs deposited June 20 (1917) hatched July 2; 1 molted to the second 

 instar on July 8, 5 on July 9 ; 5 molted to the third instar on July 13, 

 1 on July 14 ; 3 entered soil as prepupae on July 17, 2 on July 18, and 

 1 on July 19; 3 transformed to pupae on July 22, emerging as adults 

 on July 30: 3 transformed to pupae on July 23, 1 emerging as an adult 

 on July 30, and 2 on July 31. 



Seasonal History in Maine. 



Like the preceding species, the elm flea-beetles hibernate 

 as adults. They pass the winter hidden away under fences or 

 debris at the base of the elm trees, or under the loose bark on 



