192 Trans. Acad. Sci. of St. Louis 
gust 14, 1917, many winged specimens were in the lot. 
This colony remained a permanent part of the poput- 
lation during the five years observation. 
On my spring trip afield, April 2, 1921, I found on the 
ground about 400 of these ants, dead. They were still 
soft; hence they could not have been dead long. More- 
over, they had not been there on February 26, when 
I examined the bank. I had previously noted these ants 
hiding in the cracks in these walls and plugging the 
crevices with a gum-like substance; hence they could 
not have merely fallen out. The question remains 
whether these had come out to meet the spring and had 
been caught by a severe frost, or whether they were the 
accumulated dead of the winter, which had been dumped 
out by the survivors. 
In another instance, when a Polistes pallipes queen was 
taken from the nest above the bank for use in homing 
experiments, a colony of these ants discovered the nest 
soon after it was left unguarded; they bit into the walls 
of the cells and completely removed the larvae bit by bit. 
This task consumed two days, during which time the 
nest was black with ants. 
Anti-lion larvae, Myrmeleon immaculatus De Geer 
{A. N. Candell]. Myrmeleon mobilis Hagen [A. N. Cat- 
dell]. 
The numerous insects mining in the bank kicked out 
quantities of finely pulverized clay, which accumulated 
at the foot of the bank (Fig. 1,X). This made an excel- 
lent abode for the ant-lion larvae, which dug their pits 
of various dimensions (Fig. 15) and fell heir to occa- 
sional bits of provender brought in for the other nests 
but dropped, as well as sometimes the spider or ant 
