Field Studies of the Non-Social Wasps 367 
perceptibly to a stimulus. Later in the day I opened 
the nest and found sixteen more crickets belonging to 
two species; there were fifteen Oecanthus latipennis 
Riley ['A. N. Caudell], (fig. 45), twelve females and three 
males, and one lone male of Conocephalus memorale 
Seud. [A. N. Caudell]. The following evening, nine of 
these were still alive, as wag indicated by slight move- 
ments of the palpi and ovipositors, and pulsation of ab- 
domens, and an occasional twitch, in response to stim- 
ulation, of a leg or an antenna. On their third day it 
was apparent that their remnant of vitality was waning. 
Two more died five days after their capture, one at eight 
days, and the remaining six at eleven days after they 
had been caught and stored by the wasps. This shows 
conclusively that Isodontia auripes does not kill her 
prey outright, but that the captives retain life in a para- 
lyzed state for several days after they have been im- 
prisoned. 
Two specimens of a third species of Orthoptera, 
Orchelimum vulgare Har. [A. N. Caudell], were taken 
from a mother wasp while she was bringing them to her 
nest. These, too, were paralyzed, and lived in my tin 
box for four days, occasionally responding to stimulus 
by movement of the antenne or wings. 
The prey of this wasp so far represents three genera, 
Oecanthus or tree-crickets, Orchelimum or meadow grass- 
hoppers, and Conocephalus or the smaller meadow grass- 
hoppers. 
These wasps are not exempt from the ravages of 
parasites; a cuckoo-bee emerged from one cell, and its 
pupe were found in others. While one wasp mother 
was bringing in and storing provisions in her nest, a 
Silver-winged fly, Argyromoeba tigrina, was hovering at 
intervals about the burrow. At no other place were these 
