416 Trans. Acad. Sci. of St. Louss 
killed spiders, none of which responded to stimulus, and 
an egg cemented to the dorsal part of the abdomen of 
one. The fifth cell contained ten spiders, only the two 
smallest of which showed signs of life. The egg of the 
wasp was attached across the dorsal surface of one of 
the spiders. In three of the four cells it could be defi- 
nitely ascertained that the egg had been placed on the 
last spider brought in, which shows that, unlike some 
other species, this wasp provisions its cell up to the clos- 
ing point before it deposits the egg. It is interesting to 
note that only two of the very smallest spiders were in 
condition to respond to stimulus, when one might logi- 
eally expect that they would be less able than their large 
companions to withstand the effects of the sting. Is it 
possible that, since they were so small, they were deemed 
unworthy of a sting and were thrust in with none, or 
only a slight one? 
Another bee burrow used by T. clavatum was 2% 
inches in length and contained only two brood cells (fig. 
55C). Immediately below the plug was a half-inch air- 
chamber (x), then a plug of mud, and then the cell, which 
for half its length was a bee cell with its characteristic 
varnished walls. The passage narrowed again and was 
plugged, and beyond this was a second occupied cell. The 
lower cell contained eight spiders, small and medium- 
sized, some of which were rather active; the egg was 
sealed to the abdomen of the uppermost. The upper cell 
had seven spiders, four of which were large and three 
of medium size; the large ones and two of the small ones 
were dead; again only one small one, Miswmena oblonga 
[J. H. Emerton] responded to stimulus. 
Another nest was a typical bee burrow ( fig. 55A), mod- 
ified with two empty air spaces (x) next to the mud- 
plugged entrance, and eight cells of T. clavatum formed 
