154 
Psyche 
[December 
already hatched in this instance) was not injured, although 
one fly larva came through the wall very near to it. Puparia 
were soon formed and the flies emerged on May 12th. Speci- 
mens were sent to Washington and have been determined as 
Wagner id carbonaria Panz. 1 
Again, the larva of P. luctuosa developed and formed a 
cocoon, emerging on the same day as the insect from the 
first nest. It, too, was a female of about the same size as 
the one from the other cell. Although each of these females 
were undersized, they were no smaller than some others 
found in the field capturing prey and provisioning nests and 
there is no reason to believe that these could not have done 
likewise had they developed in the soil or been released 
from the laboratory. 
Newcomer, in the paper previously mentioned, gives the 
noctuid, Euxoa testula Sm., as a possible prey of the wasp, 
the adults having been captured about his laboratory at a 
time when the cutworm should have reached maturity had 
similar ones been used earlier by the wasp. He lists three 
flies associated with the wasp. There are : Hiiarelia hilarella 
(Zett.), a species which deposits living young in the nest; 
Taxigramma (Heteropterina) heteroneura (Meig.), a spe- 
cies superficially resembling Hilarella; and Metopia leu- 
cocephala (Rossi). 
Hilarella hilarella is a fly frequently met with at or near 
Los Angeles, depositing its larvae in the nest of this wasp 
and that of other nesting wasps. It was found quite common 
at Boulder, Colorado, in association with the wasp, Sphex 
aberti (Hald). 2 
1 Determined by Dr. J. M. Aldrich. 
2 Determined by Dr. H. T. Fernald. 
