1922 ] Taylor — Biology of ITasps of Genus Ancistrocerus 
59 
a second cell had been made. The mid-day heat doubtless de- 
layed the closing of the entrance until about 4 P. M., when the 
wasp was captured before she had quite finished. 
The nests built by these two individuals of Ancistrocerus 
capra were similar to those described for A. tardinotus. As men- 
tioned above nest No. 6 had two basal partitions, one 7 mm. from 
the inner end of the tube and the second about 5 mm. from this. 
There were four cells, the first, between the two basal partitions, 
empty; the second, 28 mm. long, was provided with a suspended 
egg and four caterpillars; the third was 26 mm. in length and 
had the same amount of provisions with an egg; the fourth cell 
was 25 mm. long and quite empty, its closing partition, incom- 
plete, was about 12 mm. from the entrance. The entrance was 
not closed, as the wasp was captured before she had been able to 
do so. The inside diameter of the tube was 6 mm. 
Nest No. 7 contained a tube having an inside diameter of 
7.5 mm. Its basal partition was constructed at about 15 mm. 
from the inner extremity of the tube. The first cell was 25 mm. 
long and contained its suspended egg and seven caterpillars; the 
second cell was empty, its length about 40 mm. and at about 8 
mm. from its base was a very light rim of cement where the wasp 
had started and abandoned a partition. The closing partition 
of this long empty cell was about 12 mm. from the plug which 
closed the entrance, the latter being incomplete since the wasp 
was captured during its construction. 
I was unsuccessful in rearing the wasps from nest No. 6. 
The egg in cell No. 1 adhered to the wall of the tube, because of 
excessive moisture and did not develop. The second egg became 
detached from its filament, hatched in two days and lived two 
days longer, attaining a length of about 7.5 mm., when it suc- 
cumbed to the unfavorably moist conditions. 
The single egg in nest no. 7 hatched (June 23) also in two 
days, after having become detached from its hanging position. 
On June 28 it had reached a length of 15 mm. and was vigorously 
feeding on the remnants of its provisions. In feeding it held it- 
self in a curled up position, its back nearly forming a circle, the 
