june^ 1 897.] Packard : Transformations of Hymenoptera. T9 



than in Megachile.') The sides of the epicranium at the insertion of the 

 jaws in Vespa do not bulge out, and become squarely truncated as in 

 Polistes. 



P'ig. 6. Polistes, a, larva beginning to change to pupa; b, semipupa ; b' , ventral 

 view of head and thorax; c, pupa, X 3> (Emerton del.) 



Pupa. — Compared with that of Vespa maculata the body is much 

 longer and slenderer and the tubercle on the head is not near so large 

 and prominent. The clypeus is longer and fuller ; the labrum is small. 

 The antennse have the joints half as long, and the appendage, as a 

 whole, is still less bent than in Vespa, and much shorter than in Vespa, 

 not reaching to the tip of the anterior legs. The trochanters are very 

 much larger than in Vespa and at least twice as long. The maxillae are 

 much shorter than in Vespa, the lingua not so deeply bifid. The legs 

 are much longer than in Vespa and the wings do not reach so near the 

 tibial spurs as in Vespa, while the hind legs nearly reach to the tip of 

 the abdomen. Seen sideways, the legs and wings, especially, are much 

 more oblique and parallel to the longer axis of the body than in Vespa. 

 The thorax and long narrow subpedicellate abdomen are much as in the 

 imago. The ovipositor is still exserted, while the last tergite is greatly 



