1934] Biological Notes on Sphex wrightii 153 
earlier careful removal of such material, and resulted in the 
formation of a camouflage. She next made a few trips out 
and back (manner of a locality study although no apparent 
need for it, nor probability of a later return, was seen), 
then started away and was caught some distance from the 
nest. 
The tunnel was nearly vertical and some 16 mm. long. 
The cell, at the end and at nearly right angles to the tunnel, 
contained the prey resting on one side, doubled up so that 
the posterior and anterior ends nearly met. A small, slen- 
der, clear egg about 2 jnm. in length was attached to the 
upper side on the 2nd abdominal segment and near to a 
spiracle. The prey was able to kick about when stimulated. 
It was brought home and kept in a test tube, plugged with 
loose cotton, where further facts were obtained. The di- 
gestive tract was cleared of excrement before the egg 
hatched, and thus better food conditions provided for the 
wasp larva. 
The egg hatched early on August 13, and by the evening 
of August 17 all the food provided for the larva had been 
eaten. A day later, its cocoon was well started, and by the 
evening of the next day it was, from outward appearances, 
complete. The larva while feeding, and especially at first, 
fed at the point where the egg had been fastened. It was 
greenish-yellow in color. The cocoon was photographed, 
when completed, but the larva within, upon removal from 
its protective covering and consequent exposure, was too 
active for picture-taking. It later was less active in its 
movements and more completely yellow in color. The draw- 
ing which accompanies this article was made some five 
months after the cocoon had been completed and at a time 
apparently when the insect was hibernating. 
Another observation, at the same general location at 
Owens Lake, affords additional and supplementary facts of 
behavior. This female dug her vertical tunnel on a flat 
surface between plants in a soil in which there was some 
gravel. She produced an audible nois'e or buzzing as she 
used her jaws in digging. The loosened soil, held with the 
inner surface of her head and jaws, front of the thorax and 
