THE GENUS CALOSOMA„ 



41 



LONGEVITY OF ADULTS. 



Two of the females collected in 1909 died during the spring and 

 summer of 1911. Taking it for granted that they were pupae in the 

 fall of 1908, they must have spent three years in the adult stage. The 

 males in this same shipment (although they were fewer in number 

 than the females) lived only two years, but under natural conditions 

 they probably live as long as the females, as both sexes of C. inquisitor 

 and C. sycophanta ordinarily attain approximately the same age 

 before death. 



HIBERNATION. 



Notes on the hibernating habits of this species are given in Table 

 7 and the paragraph following. 



Table 7. — Shoiving dates at which Calosoma wilcoxi entered and emerged from hiber- 

 nation in 1909, 1910, and 1911. 



Xo. Date entered, 1909. 



1791 I June 27, 1 male, 1 fe- 

 male. 



1793 

 1795 



22, 1 male, 1 fe- 

 male. 



17, 1 male, 1 fe- 

 male. 



Date emerged, 1910. 



Depth 

 of cav- 

 ities, 

 1910. 



May 26, 1 female. 



June 4, 1 male 



May 23, 1 male, 1 

 female. 



•Inches, 



June 18, 1 male i. . 



May 26, 1 male, 1 

 female. 



Date entered, 1910. 



July 12 1 



July 11, 1 male 



14, 1 female 



died. 

 11, 1 male, 1 



female. 

 Aug. 3, male died.. 



Date emerged, 1911. 



Male died in cav- 

 ity. 



Female died in 

 cavity. 



Depth 

 of cav- 

 ities. 



Inches . 



1 Beetles died during the summer. 



The average date of entering hibernation in 1909 was June 23 and 

 in 1910 July 11.. The depth at which this species hibernated in soft 

 earth ranged from 1 to 6 inches. In 1909 several specimens were 

 placed in a cage in the laboratory yard, but not all of them emerged 

 in 1910. This was not thought to be abnormal at that time, as some 

 ordinarily die during hibernation, but on May 18, 1911, one female 

 emerged from this same cage. (Fig. 5.) This is an instance where 

 one specimen remained in hibernation two winters and one summer. 



THE EGG. 



Twelve newly deposited eggs were white with a faint yellowish tinge, and averaged 

 3.9 mm. in length and 2 mm. in widtli; in form tliey were ellijjtical, occasionally 

 somewhat kidney-shaped, and often tapering toward one end. 



Most of the eggs were deposited between June 2 and June 22, 1910, 

 and hatched in ii-om 3 to 12 days. The average time passed hi this 

 stage by 108 eggs deposited that year was 6.8 days. 



BRIEF DESCRIPTION OF LARVA. 



First sta/je. — Form wimewhat stf)ut. Average length of 12 specimens, 7.8 mm.; 

 width, 1.8 mm. Caudal appendagcts of medium longtli, straight. Color l)rowii ahove, 

 ventral plates light brown. 



Second stage. — Fonn stxjuter than in first stage. Average length of six sp(;cim('ns, 

 12.0 mm.; width, 2.9 mm. Caudal appendages short and stout. Color slightly 

 UuhU-r than in first stage. 



I'fiird stage. — Viynn robust. Average length of six specimens, 22.2 mm.; width, 

 4.4 mm. Posterior angleH <»f anal w-gment obtuse, not prominent or protruding back- 



