256 
Psyche 
[September-December 
Figure 1. Diagram of nest of Pseudepipona herrichii, near Moran, Wyoming. 
Figure 2. Diagram of cell of Euodynerus auranus in abandoned burrow of Bem- 
bix pruinosa, near Roggen, Colorado. 
and 16 mm in length (Fig. 2). It was extremely delicate, the walls 
measuring only 0.3 mm thick, smooth on the inside and slightly 
rough on the outside. The soil from which it was made was darker 
and more fine-grained than the surrounding sand, so had obvi- 
ously been brought from some distance. 
The cell contained 25 small, tightly coiled, paralyzed caterpillars 
of two species. These were identified as Filatima sp. (4) and near 
Anacampsis sp. (21) (both Gelechiidae). A wasp larva only 3.8 mm 
long was suspended by a short filament from the top wall of the 
cell 7 mm from its closed end. The larva was surely not more than 
a few hours old, but the fact that the female was still provisioning 
this nest demonstrates that this was an example of delayed pro- 
visioning, in the sense of Evans, 1966. 
Bohart (1951) reported this species as making “clumps of five or 
six complete jug-shaped mud pots” in the ground (under the name 
Rygchium boscii auranurri). 
Pseudepipona herrichii (Saussure) 
I observed 2 females of this Holarctic species nesting in the hard 
sandy loam of a path, 13-15 July 1977, in Grand Teton National 
Park, Wyoming, about 4 km WNW of the Moran Post Office. 
The path was in a meadow with sparse aspens and lodgepole 
pines, about 20 m from the banks of the Snake River. On the 
13th, one of the females was digging her nest, flying obliquely 
upward with small lumps of earth to a height of about 0.3 m and 
dropping the earth 0.6-0. 9 m away. Two days later she was seen 
