164 Journal New York Entomological Society. [Voi. iv. 



The clypeus is very distinct, transversely oblong, with the edges 

 square. The labrum is large and divided deeply with two lobes, which 

 are separated as if composed of two pieces ; they overlap the mandibles 

 so that the black tips only remain in sight. Mandibles short, stout, 

 very thick, tridentate; the teeth short, subacute, the innermost being 

 the smallest. The maxillae and labium are much as usual ; prominent, 

 bulging at the end, terminating in the usual papillae ; the lingua repre- 

 sented by a transverse chitinous line. The body is cylindrical, long, a 

 little curved upon itself. The skin is hard and thick, so that the 

 genitals, nerves and dorsal vessel do not show through it. The seg- 

 ments are short, very convex, much thickened, especially on the tergum 

 and the pleural line. The posterior half of each segment is more 

 thickened than in any of the other genera of Vespidge or Apid^e ob- 

 served, and also the pleural ridges, giving to the outline of the back a 

 dentate or serrated appearance. Tip of abdomen moderately obtuse. 



The larva of Odynerus differs from Vespa in the long head, square 

 clypeus, the very distinct bilobed labrum, which are unusually deeply 

 fissured, and by the tridentate, stout mandibles ; while by the serrated 

 outline of the back it is related more to the larval Crabronidse and 

 Pompilidse. It is interesting to observe the distinct supra-clypeal piece. 



Odynerus albophaleratus Saussure. 



Pupa. — Compared with Vespa the head is much more horizontal, 

 and there is no supra-clypeal tubercle; the mandibles are much more 

 elongated ; the maxillae and lingua are as much exposed and exserted 

 beyond the tips of mandibles as in Vespa, but the whole reach farther 

 towards the end of the body, to the 2d trochanters. The maxillae and 

 lingua are a little slenderer than in Vespa. The antennae are more ob- 

 lique at the base, not being bent at nearly right angles as in Vespa. 

 They extend just to the 3d trochanters, as the thorax and body gener- 

 ally is wider and shorter than in Vespa. The legs spread a little farther 

 apart, but are proportionally of the same length and reach the same 

 relative distance from the end of the abdomen as in Vespa. The hind 

 tibial spaces are shorter and smaller thaii in Vespa. The abdomen is 

 much shorter and more spherical ; the terminal joints are shorter, being 

 withdrawn more within the abdomen. The 9 genitals are more acute, 

 the terminal sternite much shorter, smaller and less exserted, than in 

 Vespa, while the blades of the ovipositor are much exserted, and longer 

 and slenderer. 



Seen sideways, the head of Odynerus is more globular, the eyes 



