1922] Taylor — Biology of Wasps of Genus Ancistrocerus 
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had been made to close the cell. Evidently the wasp had been 
unable to provision this last cell and was in the act of closing it 
when she met her death. 
The tube utilized by the other wasp of this species (No. 21) 
had an inside diameter of 6 mm. The nest had three cells, the 
basal partition of the first having been built about 5 mm. from the 
plug of cotton which stopped the inner end of the tube. Cell 
No. 1, 30. mm. long, had 13 caterpillars, cell No. 2, 28 mm. long, 
had seven and cell No. 3, 13 mm. long, contained eight. All were 
provided with eggs suspended in the usual manner. The entrance 
to the nest had no closing plug, the outer wall of the third cell 
being about 12 mm. from the entrance and the space beyond it 
was entirely vacant. 
Only one wasp from these nests reached maturity, a female. 
The duration of the stages in her life was as follows; egg, 3 days; 
larva, 16 days; pupa, 13 days. The larva became inactive about 
six days after hatching and spun no cocoon. The imago lived 
thirty-five days. 
Miscellaneous Notes. 
Other nests built by undetermined species of Ancistrocerus 
were observed during the summer, but with most, because of 
parasites or other unfavorable conditions, the data obtained are 
too fragmentary to be of further use than to substantiate the 
findings on the species treated in more detail. In general the 
observations on these nests are consistent with what has already 
been recorded. 
Nests started later in the summer (four in number, built 
Aug. 8, 16, 17, and 22) have a somewhat different history. 
Instead of pupating a few days after spinning, individuals from 
these nests still remain as larvie during the winter and will 
probably not complete their development until the following 
June. 
Not a few nesting places presented evidence of nests having 
been started by wasps and abandoned in an incipient stage. In 
some basal partitions were made, never to be utilized. In two 
