146 HYMENOPTERA. 



(Fig. 81) is longer and slenderer, being quite different from the 

 rather broad and flattened larva of Andrena. The body is 

 rather thick behind, but in front tapers slowly 

 towards the head, which is of moderate size. Its 

 body is somewhat tuberculated, the tubercles aid- 

 ing the grub in moving about its cell. Its length 

 is .40 of an inch. On the pupa are four quite dis- 

 tinct conical tubercles forming a transverse line 

 Fig. si. j us t i n front of the ocelli ; and there are also 

 two larger, longer tubercles, on the outer side of each of 

 which an ocellus is situated. Figure 82 represents the pupa 

 seen from beneath.' 



Search was made for the nests on July 16th, when 

 the ground was very hard for six inches in depth, 

 below which the soil was soft and fine, and over 

 twenty cells were dug out. "The upper cells 

 contained nearly mature pupae, and the lower ones 

 larvae of various sizes, the smallest being hardly 

 distinguishable by the naked eye. Each of these 

 small larvae was in a cell by itself, and situated 

 upon a lump of pollen, which was of the size and shape of a 

 pea, and was found to lessen in size as the larva grew larger. 

 These young were probably the offspring of several females, 

 as four mature bees were found in the hole." (Emerton.) 

 The larva of an English species hatches in ten days after the 

 eggs are laid. 



Another brood of bees appeared the middle of September, 

 as on the ninth of that month (1864) Mr. Emerton found sev- 

 eral holes of the same species of bee made in a hard gravel 

 road near the turnpike. When opened, they were found to 

 contain several bees with their young. September 2, 1867, the 

 same kind of bee was found in holes, and just ready to leave 

 the cell. 



Like Bombus, the females are supposed to hybernate, the 

 males not appearing until late in the season. Like Andrena, 

 these bees suffer from the attacks of Stylops, and according to 

 Shuckard, an Ichneumon preys upon them, while certain spe- 

 cies of Cerceris, Philanthus, and Crabro carry them off to store 

 their nests with. 



