260 Wisconsin Academy of Sciences, Arts, and Letters. 
mally, built tunnels of pieces of bee-bread and their silk, and grew 
rapidly. The average length of the life history from the newly 
hatched larva to the moth was thirty-nine days. Two of the 
moths were males and one a female. 
Dead Bees. A similar experiment with dead bees was tried, 
but none of the young larvae lived. Both whole and crushed 
bees were placed in the dish, and in spite of the abundance of 
food, all the larvae died. 
Larvae ,. If larvae were kept in a crowded condition, it was 
noticed that the nearly mature larvae would eat pupae in the 
cocoons, as soon as pupation had taken place. It was once noted 
that when a larva which had been accidentally injured was put 
back into the dish it was immediately eaten by the others. Hence 
the idea arose of ascertaining whether larvae were so cannibal¬ 
istic that they could be raised on animal food alone. 
Seventeen larvae, ranging in size from 10 to 13 mm., were 
placed in a Stender dish, and a lacerated larva was placed in the 
same dish. The dish was then placed in the constant-tempera¬ 
ture room at 37°C. In a short time the larvae began to eat the in¬ 
jured one, which, however attempted to defend itself. They finally 
consumed all of the larva except the head and the brown chitinous 
part of the first thoracic segment. Then the larvae wandered 
aimlessly about the dish and after two or three hours were raven¬ 
ously hungry. At the end of twenty-four hours the larvae were 
observed again, and only fourteen were left. The heads of the 
devoured larvae were lying with the refuse in the bottom of the 
dish. Two days later twelve larvae remained, the following day 
but ten. At the end of six days only two larvae were to be 
found; one of these was dead, while the other was in a small co¬ 
coon made of excrement, the heads and half-eaten bodies of lar¬ 
vae, and silk. The larva did not pupate but seemed to dry up 
in the act of transforming into a pupa. 
At another time thirty-six larvae were equally divided between 
two Stender dishes and the latter were placed in the constant- 
temperature room. The following day no decrease in number 
was noticed in either dish, but the larvae were very restless and 
showed a tendency to bite each other. A day later only etight re¬ 
mained in one dish and eleven in the other. After four days 
more there were two larvae in one dish and one in the other. 
These spun cocoons and pupated, but the pupae dried up and did 
not hatch. 
