28 



CALOSOMA SYCOPHANTA. 



number of individuals in the experiment died owing to a scarcity of 

 food and other causes, but the following nine records give the length 

 of time which was spent in each larval stage and this may be con- 

 sidered as approximately correct for larvae that hatch early in the 

 season when the weather is cool and the food supply is somewhat 

 restricted. 



From the foregoing experiments data were secured regarding 

 the length of time in each larval stage. 



Table IV. — Record of time passed in different stages by larvze of Calosoma sycophanta 

 hatched from eggs laid by beetles taken out of hibernation in March and April. 



Xo. 



Date 

 hatched. 



First- 

 stage 

 larva?. 



Second- 

 stage 

 larva?. 



Third 



stage 



(until 



finished 



feeding). 



765A » 



1908. 

 Mar 23 

 May 24 



Mav 25 

 Mav 26 



Days. 

 6 

 8 

 7 

 6 

 6 

 5 



Days. 

 5 

 2 

 4 

 9 

 8 



8 

 8 



Da us. 

 IS 



765A 3 



19 



765A e 



15 



765A " 



13 



765A 9 . 



Mav 27 



...do 



. .do..... 



15 



765A" 



7&5AH 



16 

 14 



765A 17 .... 



Mav 28 

 do 



4 

 4 



14 



765A 2 



8 15 









Average length of time in each stage: 



First larval stage 



Second larval stage 



Third or feeding stage 



Davs. 



Total time larva? fed. 



2G* 



In order to check up this experiment and to determine the differ- 

 ence in time required for larva? to develop during hot summer weather 

 when food is abundant, another set of experiments was carried on 

 with larva? that hatched on June 20 and the results are tabulated as 

 follows : 



Table V. — Length of time passed in different stages by larvae of Calosoma sycophanta 

 developed from eggs laid by beetles that emerged normally. 



Xo. 



Date 

 hatched. 



First- 

 stage 

 larvae. 



Second- 

 stage 

 larva?. 



Third 



stase 



(until 



finished 



feeding). 



771D 



190S. 

 June 20 

 ...do 



Days. 

 2 

 2 

 2 

 2 

 2 

 2 

 2 

 3 

 2 

 2 

 2 

 2 



Days. 

 3 

 3 

 3 

 3 

 3 

 3 

 3 

 2 

 3 

 3 

 3 

 3 



Davs. 



9 



771E 



9 



771F 



..do 



9 



771 G : 



..do 



7 



771H '. 



..do 



9 



7711 



..do 



9 



771J 



..do 



9 



771 K 



...do 



9 



771L 



.do 



9 



771M -. 



...do 



9 



7710 : 



...do 



9 



771Q 



...do 



9 









Average length of life in feeding stages: 



First larval stage 



Second larval stage 



Third larval stage 



Davs. 



Total. 



