48 Annals Entomological Society of America [Vol. XI, 



EXPLANATION OF PLATE IH. 



Fig. L Side view of a nest of Bombus auricomus Robt., of natural origin, on 

 September 8, 1917, showing: o, perpendicular arrangement of the 

 comb; b, usual wax-pollen covering used in forming a protective envel- 

 ope about the comb. Reduced. 



Fig. 2. Top view of a nest of Bombus auricomus Robt., of natural origin, on 

 September 8, 1917, showing: a, cocoon partially filled with pollen; 

 b, cocoon used for storage of honey; c, three egg-cells; d, uncapped 

 cocoons. Reduced. 



