Dec. 1896.] Packard : Transformations of Hymenoptera. 



1G3 



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 Rhopaliiin 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 which are not withdrawn in the pupa, as in the imago, and would not, 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 larvse associated with the ma- 

 ture pupa April i8th, showing a possibility of two broods. 



Odynerus (probably albophaleratus 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 apex. The site of the an- 

 tennae forms a depressed area on a distinct piece between the eyes and 

 supra-clypeal piece. 



