sept. 1897.] Packard : Transformations of Hymenoptera. 
119 
ing opened, disclosed four partitions, two at each end of the slightly el¬ 
lipsoidal area, with two at each side; the two lateral ones being widely 
separated, but the other two only separated by a thin partition. 
These are walled in by the queen bee after she has placed one or two 
eggs in each cell. Out of this mass of food the young larvae when 
hatched begin by eating the food to gradually construct their cells in 
the manner observed and described by Professor Putnam. One would 
suppose that there would be one larva only in each compartment, but 
on the contrary I found two young larvae in each. The eggs are the 
same as those of B. fervidus , no specific differences being discernible. 
The larvae w r ere young, none being more that one-third the size of the 
workers in the semipupa stage, while the single female larva was of full size. 
The young larvce compared with those of B . fervidus .—They are so 
similar that it would be impossible to distinguish them. The larvae of 
B. fervidus differ more among themselves than do those of B. separatus 
and B. fervidus ? The size of the head and proportions of the body, 
are the same. The thickened portions of the segments are also much 
the same, though there is a difference in that this portion is a little 
thicker in B. fervidus , but this is not a constant character. Indeed, 
in comparing two larvae of the two species mentioned, each nearly a 
quarter of an inch long, I can see no difference between them. 
Pupa of Worker .—It can best be described by comparing it with that 
of B. fervidus , of which I had the greatest number of specimens. Be¬ 
sides being a little smaller, it differs in form, being more plump, nearly 
a line shorter, and slightly broader. The head is more triangular, be¬ 
ing shorter and at the same time proportionately broader. The eyes 
converge slightly towards the mouth. The antennae and clypeus and 
labrum, as well as the ocelli, show no appreciable differences. 
The genital armature and tip of the abdomen in general do not,con¬ 
trary to our expectation, afford good specific distinctions. We see, 
therefore, that the pupae differ specifically in their size and proportions, 
while the perfect bees have added the more readily recognized differ¬ 
ences in coloration and hairiness. 
Of the ten worker pupae two were a little larger, almost in the sub- 
imaginal stage, and dark, and belonging apparently to the second 
brood of workers. 
Average length of 2 worker pupae of the first brood, .5o; breadth, 
.32 inch. 
Average length of 8 worker pupae of the second brood, .46; breadth, 
.28 inch. 
_ < 
Female Pupa _The pupae of the females are equal in size to that of 
i 
