THE GENUS CALOSOMA. 



51 



surface and reset in the ground. May 26, 1910, the female emerged 

 from the latter cavit}^ 



Other full-grown larvas were placed in similar cages about the same 

 time and were not disturbed, but allowed to emerge normally the 

 following spring. One specimen was unearthed in the fall to make 

 sure that this species does not hibernate in the larval or pupal stages. 

 None of the adults reared in 1909 emerged from its cavity as soon as 

 transformation from the pupa took place, as did C. calidum. The 

 time spent in this stage varies, being apparently from 10 to 14 days. 



TIME REQUIRED TO COMPLETE LARVAL STAGES. 



Data secured from larvje in 1909 showed that the first stage covers 

 a period of from 2 to 5 days or an average of 4 ; the second an average 

 of 5, and the third 11. The total number of days the larvije are 

 active and feed is 20, after which time they burrow into the earth 

 and form the pupal chamber. The time required for this is practically 

 the same as with other species of the genus studied. 



FOOD CONSUMED BY LARV^. 



Mention has previously been made concerning the feeding of the 

 larv?e upon the larv?e and pupse of H. guttivitta in New Hampshire. 

 Some larvse were brought in from the field in second and tliird stages 

 and fed to maturity on caterpillars of Porthetria dispar. A few 

 others that hatched from eggs deposited in breeding jars were fed 

 until they reached the third stage, when all died, and combinations 

 were thus compiled from these. 



The data obtained from feeding records of these larvae are given in 

 Table 10. 



Table 10. — Food eaten by larvse of Calosoma frigidum, 1909. 



No. of 

 lari-a. 



Malacosoma ameri- 

 cana and Por- 

 thetria dispar 

 fouri hand sixth 

 stage caterpillars 

 eaten during 

 first larval stage. 



Porthetria dispar. 



Total. 



Sixth- 

 stage cat- 

 erpillars 

 eaten 

 during 

 serond 

 larval 

 stage. 



Sixth- 

 stage cat- 

 erpillars 

 eaten 

 during 

 third 

 larval 

 stage. 



2731-A 

 27G.5-A 

 2731-E 

 276.5-B 

 2731-H 

 2765-E 



2 



6 







9 



17 



3 





4 

 4 



13 



20 



3 



11 



18 









The average number of large-sized caterpillars, mostly sixth-stage 

 PorthetHa dispar, consumed by a single larva from hatching to ma- 

 turity was 19, or approximately the same number as was destroyed 

 by larvse of C. vAlcoxi or 0. iru/uifiitor. Had caterpillars of Hctfrn- 

 cawyjja f/vttivitta, which arc much smaller, been used, the number ch- 

 stroyed would urifloubtedly have reached 25 or 30. June 23 and 28 

 were the dates of hatching of some of the larvfc, and they continued 

 their activity in and out of the earth in jars for about 20 days. 



