Sept. 1897] Packard: Transformations of Hymenoptera. 11 T 



colony could be estimated by counting the empty cells. These were 

 wanting in the upper third, or rarely the upper half, which had been 

 eaten away by the bees to allow the occupants to escape ; the edges 

 being rough and irregular. Some of the cells were nearly all gone, three- 

 fourths of some of them having been removed ; these were situated on 

 the sides of or nearly beneath the bunches of small cells which sur- 

 rounded the single female or queen cell. 



At this date there were 58 empty cells, hence the colony, if all were 

 alive, was of course composed of that number of individuals ; of these 

 all were workers except a single male and two females. 



Larva. — The larva are easily distinguished from those of B.fervi- 

 dus and B. separatus, which is the more unexpected, since the two last 

 named species agree so closely after the specimens compared have been 

 in alcohol. The head is considerably smaller, nearly one-fourth so, 

 than mfervidus, while the transverse raised bands across each ring are 

 much thicker, and the lateral raised pleural lines are much more promi- 

 nent than in B.fervidus, thus making the under side of the body ap- 

 pear flatter and the upper side more convex than in fervidiis. The 

 whole body is more lunate, compact and blunter at the extremity than 

 vafervidus. Such are the differences in comparing twenty larvse with 

 an equal number of those of fervidus. Whether these differences are 

 constant, and have been stated correctly, future study will prove. The 

 sizes of the different stages of growth correspond very exactly with 

 those of the equivalent stages mfervidus. 



Eggs The eggs of this and all the 'species when compared do not 



differ, and if they were all intermingled, the species could not be picked 

 out. 



Pupa. — Comparing some (eight) $ semipupse with an equal num- 

 ber of 9 semipupai oi B.fervidus, there are no differences, not even 

 in the tip of the abdomen. 



Compared with the male of fervidus it is very considerably smaller 

 and slenderer, the abdomen being sensibly more produced towards the 

 more acute tip and the limbs are throughout more slender. The head 

 is shorter and broader. The second joint of the antenna is longer, 

 passing beyond the eyes, where in fervidus they do pass beyond the 

 lower angle and outer edge of the eyes. The maxillae and lingua are 

 shorter than mfervidus, being just as described in the worker pupse of 

 B. separatus, and are unitedly narrow, as in the last named species. 

 The limbs are no longer, but all the joints are considerably narrower 

 than in fervidus. Here, as in the other sex, the genital armature does 



