PHYSIOLOGICAL ANIMAL GEOGRAPHY 559 
reach. If larvae are not fed, they will not die for a week or two, 
or even longer, but the lengths of their periods of growth are 
greatly increased. 
B. HABITAT RELATIONS OF THE SOIL-INHABITING TIGER BEETLES 
(CHARACTERISTIC DATA) 
The environmental relations will be illustrated by the relations 
of three species of Cicindela purpurea Oliv. subspecies limbalis 
Klg., tranquebarica Herbst, and sexguttata Fabr. 
Fig.6 The pupa. Three times natural size. 
a. Crcindela purpurea limbalis 
The adults are beautiful red and green, though not strikingly 
conspicuous forms. Eggs are laid in June; the larvae hibernate 
usually in the second instar and pupate in the second summer. 
The imagoes emerge about a month after pupation, hibernate, 
and become sexually mature late in the third June. The larval 
life lasts twelve to thirteen months; adult life, ten months; two 
years between generations. 
1. General behavior of adults. They are not strong fliers, but 
are very alert and start to fly whenever one approaches them. 
The form of the moving object is not important; size and move- 
ment produce the reaction apparently without reference to form 
and color. I have not been able to ascertain that they turn 
and face an approaching person with any degree of uniformity, 
