Field Studies of the Non-Social Wasps 373 
Surely she can have no comprehension of a number so 
large, but she must have a keen sense of quantity. It 
would not be surprising if a wasp mother could perceive 
the difference between three and four fat caterpillars, 
but it is surprising that she can measure out, either by 
number or quantity, equal portions of articles so small. 
The first, fourth, fifth and sixth cells gave us simul- 
taneously an adult each on July 4, while the ninth and 
tenth cells each harbored a full grown larva when the 
nest was despoiled at that date, 
AwnotHer ApHip Huntress, Diphlebus tenax Fox 
[S. A. Rohwer]. 
It is interesting to see to what degree this species is 
similar in its nesting habits to its sister species, D. bipari- 
tor, An uprooted tree with much soil clinging to the roots 
afforded the nesting-site for one of these little wasps. 
In the firm earth which still clung to the roots and in 
the area of bare earth exposed beneath, a number of 
Hymenoptera were or had been nesting. The burrows 
of Trypoxylon sp. and the turrets of the white-banded 
bee, Entechnia taurea, were there. Several kinds of bees 
had already taken up their abode among the dried roots, 
although it was at once evident that the place had not 
been available for their use for more than a season or 
two at most. This is a correct indicator of the readi- 
ness, even the eagerness, of solitary Hymenoptera to 
utilize any bald, sunny area where the vegetation will 
not impede their work. 
Besides these terrestrial dwellings there was in this 
instance an attractive nest of a kind new to me, in the 
very wood of the exposed roots. In a portion of the 
Toot two feet from the ground but well sheltered by a 
lump of soil above, was a small crack. Beneath this 
