June, 1S97.] Packard : Transformations of Hymenoptera. 



85 



a 



Fig. 8. N'otnada probably imbricata, a, semipupa ; b, pupa. X 3- (Emerton del. ) 



Nomada imbricata Smith. 



Pupa. — The pupee of both sexes occurred in the nests of Andrena 

 vicina. 



$ . Head not so broad as in Andrena. Ocelli situated in a curved 

 raised line ; on the upper and posterior edge of the orbit are three con- 

 spicuous spines, which are not present in the other genera, and are 

 evidently of use in locomotion. Front of the head much narrower and 

 depressed next to the orbits ; the insertions of the antennae are nearer 

 together than in Andrena. Supraclypeal piece well marked, though 

 the outlines are as yet indistinct. The clypeus is broad, subtriangular, 

 the surface very convex. Labrum not distinct, separated by suture 

 from the clypeus, somewhat triangular in form, with the front edge well 

 rounded. Mandibles long, cylindrical, regularly incurved; tips uni- 

 dentate, subacute. Antennse stout, not clavate, reaching to the inser- 

 tion of the posterior trochanter, also reaching just to the tips of the 

 maxillary palpi; the joints as long as broad, each with a mesial constric- 

 tion. From the labrum drops down a long slender pointed tongue-like 

 piece (the epipharynx) into the base of the maxillae (also present in the 

 pupa of Bombus). The lingua reaches beyond the tip of the antennae; 

 the tip long, slender and pointed. Paraglossae as long as the part of the 



