PHYSIOLOGICAL ANIMAL GEOGRAPHY 585 
the top, and remain apparently without food, and do not grow appre- 
ciably. In 1907, larvae of venusta and limbata closed their holes on 
June 12, and some did not appear again until August 25, nearly two-and- 
a-half months. A few, however, would open up at night, throw out a 
lot of earth, and then retire again. These larvae were always active 
when dug out. This strange habit may be due to the dryness of the 
soil to some extent, though it is not altogether so, as holes have remained 
closed during wet weather, and they are always opened in autumn or 
late summer, and deepened before winter, no matter what the condition 
of the ground is. The extreme heat of the sun may also be a factor of 
some importance. The beetles are unquestionably influenced by tem- 
perature, and will go into winter quarters earlier on a dry, hot fall than 
they do during a cold one, and hot summer days are much preferred for 
commencing winter homes. 
The following table shows the depth of burrows at Chicago 
and at Aweme, Manitoba. It includes all available data. 
TABLE 9 
Showing the relative depths of hibernation burrows of adults and burrows of larvae, 
of the same species, in the same soil. Manitoba, Criddle (07, 7°10). Compare 
with table 10 
LARVAE AbuL? HIBERNATION 
Q | CHICAGO AWEME =) CHICAGO AWEME 
——— = S 
SPECIES Z wn i 
’ B Jepth of 
° F ° : Depth of 
S Pepin of Depth of Burrow B ee Adult in 
a EO a yer De Hibernation 
) i tion 
cm, cm. cm. cm. 
€. limbalis......| clay 5-10 15-20 clay 5-8 7-15 
C. tranquebarical sand? | 22-50 43-50 | clay 15 15-80 
CMiormosaes. ¢) sand 30-50 125-200 sand 62-117 
C. seutellaris.... 
5 Or ~ i | « 
lecontel....... sand 25-45 70 | sand 25-64 
Crlepidaees.....sands| 60-90 145-175 | 
C. 12-eguttata ... allu-| | | 
vial | 5-10 15-37 clay | 10-15 5*25 
C. repanda sand | 10 | clay 5-10 15-20 
