1922 ] Taylor — Biology of Wasps of Genus Ancistrocerus 53 
Nest No. 3. 
Date of Cell No. 1 
Cell No. 2 
Cell No. 3 
Cell No. 4 
9(f) 
(?) 
c? 
d' 
Oviposition June 16(?) 
June 16 
June 16 
June 17 
Hatching * 
June 19(?) 
June 19(?) 
June 20 
Cocoon spinning 
** 
June 24 
June 25 
Pupation 
June 29 
June 30 
Imagination 
July 10 
July 10 
Emergence 
July 14 
July 11*** 
Death 
Oct. 6 
Aug. 27 
*Did not hatch. 
**Died June 22. 
***Emergence probably 
premature 
; cocoon broken open 
for observation. 
The above tables give the following as the lengths of the 
stages in the life of Ancistrocerus tardinotus : egg, 3 days; larva, 
10-14 days; pupa, 11-14 days. The larger figure for the larval 
and pupal stages represents the length of these stages in the 
single female which reached maturity, from the innermost cell 
of nest No. 2. The other five individuals which matured from 
these two nests were all males. 
The eggs of this species, like those of other species noted 
here, show the first sign of hatching by a swelling of the chorion 
on one or both sides. This seems to be due to the flattening of 
the larva, the pleura becoming somewhat protuberant. (Fig. 4). 
The chorion then becomes ruptured at its anterior or lower end, 
and the minute larva by slow movements works about three- 
quarters of its body out. Thus suspended it remains for half or 
three-quarters of an hour during which time it appears to derive 
some nourishment through the integument of the caterpillars 
which it may be able to reach. Figure 5, sketched from an un- 
determined larva of Ancistrocerus illustrates the appearance of 
the larva in this position. Soon freeing itself from the chorion, 
the larva moves about actively, finally taking a position with its 
mouth closely applied to the integument of one of its caterpillars 
often just behind or near the thorax. At first it appears to feed 
