Dec. 1896.] Packard : Transformations of Hymenoptera. 
163 
the ocelli and antennae are two very prominent acute tubercles. The 
ocelli are very large; the thorax much as in the imago, but broader, 
and the propodeum is more horizontal, the enclosure being indistinct; 
the mesial furrow well marked. The pedicel is broader than in the 
imago; the rings of the abdomen more dentate on hind edges, while the 
abdomen, including the propodeum, is much longer than in the imago. 
Fig. 3. Larva and pupa of Rhopalum pedicellatum, enlarged ; h , temporary 
tubercles on head of pupa. (Trouvelot del.) 
These details of difference in the pupa apply but to the mouthparts, 
which are not withdrawn in the pupa, as in the imago, and would not, 
therefore, be so well noticed in the imago, where these parts are much 
more difficult to compare. 
It was interesting to find half-grown larvae associated with the ma¬ 
ture pupa April 18th, showing a possibility of two broods. 
Odynerus (probably albbphaleratus Saussure). 
Larva. —The head is considerably longer than in Vespa; more 
elongated, narrower and more convex, globose. The clypeus and 
mouth-parts are more advanced, more prominent. Situation of eyes is 
not indicated by the narrow testaceous stripe. The supra-clypeal tri¬ 
angular piece is more distinctly marked than in Vespa or in the larval 
Apidae; it is obtusely pointed behind at the apfex. The site of the an¬ 
tennae forms a depressed area on a distinct piece between the eyes and 
supra-clypeal piece. 
