ODYNERUS. 203 



Form, sculpture, livery, almost identical with that of the 0. 

 fulvipes. The size may be a little less. In fact it cannot be 

 distinguished from this species but by the following characters. 



Prothorax not having its angles dentiform. Concavity of the 

 metathorax having its borders perhaps a little more coarsely 

 punctured, more rounded. First abdominal segment more 

 strongly cribrose ; its punctures as strong as those of the thorax. 

 The suture feeble, but yet distinct. (The anterior face of the 

 segment is smooth and the superior face is very coarsely cribrose 

 with little or no channel along the suture.) 



The livery differs by the yellow being a little more extended 

 on the head, a wider yellow arc on the clypeus, and the yellow 

 of the scape much extended at the base. Segments 3-4 also are 

 bordered with yellow and the 2d segment ornamente.d on each 

 side near its base with a yellow spot ; the two oblique spots of 

 the first segment forming an interrupted band. 



Var. Mesothorax above with or without yellow spot. 



% . The metathorax is notably more rounded than with the 0. 

 fulvipes, and does not form two lateral angles. Clypeus, man- 

 dibles, inner bordering of the orbits, and the legs, yellow, as well 

 as the femora. The remaining livery as with the female ; the 

 1st segment ornamented with an interrupted band, and the 2d 

 with two lateral spots, yellow. No yellow spots on the disk of 

 mesothorax. 



In spite of these differences the 0. ssecularis may be but a 

 var. of the fulvipes. 



Bess. a. cliff. — Naturally, this species has a very great resem- 

 blance also to the 0. conformis and vagus, but is distinguished 

 above all by its first abdominal segment, of wdiich the great 

 punctures are suddenly arrested on meeting the anterior face of 

 the segment so as to define the suture. It differs from the 0. 

 anormis by its more cylindrical abdomen, more strongly punc- 

 tured, with the 1st segment more lengthened, adorned with two 

 oblique bands and not with two yellow dots. Compare also the 

 0. deject us. 



Hob. The Southern United States. 9 % from Tennessee. 



Observation. — The 0. fulvipes, sseadaris, vagus, conformis 

 are types which appear almost to pass from one to the other and 

 of which it is difficult to trace the precise limits. One should 

 take notice of the first two for the variations of the same species 



