PHYSIOLOGICAL ANIMAL GEOGRAPHY DO5 
were found on the higher and drier parts of the clay bank. The 
eggs from which these larvae were hatched were laid in June of 
1905. The total rainfall at Chicago, from January to June inclu- 
sive, was 42.5 cm. (17.1 inches), for April, May and June 29.0 cm. 
(11.5 inches), and for May and June 21.0 em. (8.4 inches) and for 
June 8.0 em. (3.2 inches). 
In 1907, cn the other hand, they were on the low places near the 
springy situations and in small gullies, the eggs from which these 
larvae hatched having been laid in June 1906. The rainfall from 
January to June inclusive in 1906 was 29.0 cm. (11.6 inches), 
from April to June inclusive 14.5 em. (5.8 inches), for May and 
June 10.0 em. (4.0 inches), and for June 4.7 em. (1.9 inches). 
The failure of the larvae to migrate stands out clearly even a 
year after the egg-laying took place. The larvae of this species 
usually adjust the depth of their burrows to the temperature 
conditions of the sand in which they were placed under experi- 
mental conditions. In nature, however, I doubt that these larvae 
can dig their holes deeper when the soil becomes dry and the tem- 
perature high, because at such a time the clay is very hard. 
d. Relation of larval habitat and distribution of food to the 
distribution of adults. In a natural indentation of the coast at 
Lake Bluff, Hlinois, a beach of considerable width has been depcs- 
ited and the bluff bears a very dense forest. No larval habitat is 
present, and the adults of C. limbalis are not present on the beach. 
Their food is at least as abundant here as where the clay bank is 
bare. 
As we have stated, the tiger beetles feed over an area much more 
diversified and much greater in extent than the breeding place 
or larval habitat. 
The adult beetles feed on any available animals. The feeding 
areas which are adjacent to like breeding places differently 
located, are frequently very different, and are occupied by very 
different food species. The food is then of necessity different for 
forms living in different places. 
In captivity the adults have been fed with lean meat of various 
sorts (beef, pork and mutton) which they eat readily when fresh. 
They also pick up the ants, Thysanurans, etc., in the cages, and 
