42 



BULLETIN 417, U. S. DEPARTMENT OF AGRICULTURE. 



ward. Caudal appendages stout at base; dorsal protuberance short, stout, located 

 two-thirds distance from base to tip. Appendages beyond protuberance slender and 



pointed. Color chestnut brown above. 



Fig. 5.— Individual hibernation cage that has 

 been removed from the earth. Arrow shows 

 where a Calosoma beetle hibernated; enlarge- 

 ment shows the beetle in the cage. (Burgess. ) 



Ventral plates amber. Reddish - brown 

 patch at base of caudal appendages in 

 second and third stages. 



LENGTH OF TIME TO COMPLETE LARVAL 

 STAGES. 



The duration of each larval 

 stage was determinea from a few 

 of the individual records of larvae 

 in 1910. Itwas found that the first 

 stage covered on an 

 average 7 days, the 

 second 5, and the 

 third, to the date the 

 larvae ceased feeding, 

 14. As is shown in 

 Table 8 the active 

 growing period ex- 

 tends over about 28 

 days. The larvae 

 used in these experi- 

 ments hatched June 

 9 and were practi- 

 cally full grown about 

 July 5, or 26 days 

 after hatching. The 

 time elapsing between the dates 

 the larvae ceased feeding and the 

 dates of pupation proper was not 

 obtained accurately, but is approxi- 

 mately about 4 or 5 days. 



FOOD CONSUMED BY LARV^. 



Daily feedmg records kept from 

 the date of hatching to the date 

 the larvae ceased feeding and buried themselves for pupation were 

 as shown in Table 8. 



Table 8. — Food eaten by larvse of Calosoma vjilcoxi, 1910. 



No. 



Date 

 hatched. 



Date 

 ceased 

 feeding. 



Sixth-stage cater- 

 pillars. 



Total. 



Malaco- 

 soma 

 ameri- 

 eana. 



Porthe- 



tria 

 dispar. 



2778-D 



2778-E 

 2778-F 

 2778-G 

 2778-H 

 2778-J 



June 9 



...do 



...do 



...do 



...do 



...do 



July 12 

 2 

 8 

 4 

 1 

 12 



3 



7 

 2 

 3 

 8 

 8 



7 

 9 

 13 

 16 

 9 

 11 



10 

 16 

 15 

 19 

 17 

 19 



