564 VICTOR E. SHELFORD 
but these are the only ones found in such a situation, as compared 
with over six hundred actually dug from the clay bank. They 
are entirely absent from the sandy stretch at the base of the bluff. 
I have dug very many larvae of Cicindela lepida from this situ- 
ation, and have never found a single larva of C. limbalis. How- 
ever, larvae of C. limbalis are not equally abundant on all parts 
of the clay bluff. The portions which are very steep, subject to 
land slides in the spring, and very dry in summer, are essentially 
without larvae. The forest covered portions are without larvae. 
The shrubby parts are inhabited only in the open places. The 
bare places with a few herbaceous plants have the greatest nwmber 
of larvae. 
b. Migration of larvae. As I pointed out in 1908, the larvae 
of this species rarely migrate, but remain at the point where the 
egg was laid. Only fifteen per cent of them left their burrows 
during a period of two or three weeks after they had been dug 
from their normal habitat and placed in holes made with a wire 
in moist sand. In eighty-five per cent of the cases the larvae 
smoothed off the sides of these burrows, and remained in this very 
unnatural situation—one in which all of the physical conditions 
had been changed. The steep, sloping clay had been replaced 
by level sand, resistantly packed particles of clay, by coarse sand 
grains, and the solid edge of the burrow (fig. 10) by the crumb- 
ling sand. In the field, I have never seen larvae crawling on the 
ground. Burrows have been found empty in a few cases in 
digging about six hundred larvae. In one or two cases the dead 
larvae were found in the burrows and as these would soon disin- 
tegrate and leave the burrow apparently empty, vacant holes may 
have been left in this way. Then again, ants may overcome a 
larva, and after chewing off its antennae and tarsal joints, drag 
it from the burrow. While larvae may occasionally migrate, the 
empty holes are not so numerous but that their occurrence may 
be due to other causes. 
c. Loeal distribution of larvae dependent upon adjustment in 
egg-laying. The larvae vary in position from year to year appar- 
ently with the weather conditions at the time of egg-laying. They 
live for a little more than a year. In 1906 the full grown larvae 
