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. fervldus, no specific differences being discernible. 



The larvae were 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 iarzm compared tvith 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. separotus 

 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 

 oi 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 e} es 

 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 



