June, 1897 .] Packard : Transformations of Hymenoptera. 
85 
Fig. 8 . Nomada probably imbricata , a, semipupa; b, pupa. X 3* (Emerton del .) 
Nomada imbricata Smith. 
Pupa .—The pupae 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. Antennae 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 Bombas). The lingua reaches beyond the tip of the antennae; 
the tip long, slender and pointed. Paraglossae as long as the part of the 
