156 
Psyche 
[June 
cell which I opened contained a fat female but no eggs or 
young; an additional cell (found open) contained the shed- 
ding skin of the mother and several live triunguli. My first 
thought was, upon finding the first small opening, that I 
had discovered the mother in the act of biting her way out. 
But upon finding in another cell, behind a similar hole, a 
dead mother and her live young, I began to suspect that the 
mother beetle does not leave the nest. This would indi- 
cate that one or two conditions must obtain; either ferti- 
lization must have taken place through the small aperture 
in the wall of the Anthophora cell, or the eggs of the Hornia 
must have hatched without fertilization. My present data 
are insufficient to give preference to either theory. 
I doubt that locomotion by the adult is a factor in their 
dissemination; their wings are small and useless in flight, 
their legs are too weak for lengthy walks, and the 
body too heavy for either type of movement. I have, how- 
ever, as already stated, seen two adults, (in addition to the 
one recorded in the Ecology paper) slowly lumbering along 
the clods of earth containing cells of the anthophora bee, 
but these beetles probably had escaped from clods broken 
by me for observation. 
The colonies of live triunguli discovered on June 7 were 
placed outdoors on the clay bank, among a weak colony of 
bees. They were watched for about ten days. During that 
time, all the colonies held together without any evidence of 
dissemination. They seemed to get along without food, 
unless they ate part of their own number, for the bank 
afforded them no means of subsistence. On June 25, more 
than two weeks after they had been placed out of doors, 
the colonies were still intact, although much reduced in 
size. However, some must have been moving about, for 
several were found dead in a nearby spider web. 
The idea seems prevalent that the eggs hatch in the fall 
and the young hibernate. In this species, at least, the eggs 
are laid in the spring. One female, taken from a cell several 
years ago, laid many eggs in a vial in the spring. This 
corroborates Riley’s statement that the eggs, laid loosely 
in the burrows of the bees, hatch in June, but our creatures 
did not substantiate his statement that the young are ex- 
tremely active. 
