ODYNERTJS. 169 



?. Form stout. The size and shape of the 0. albophaleratus, 

 but the thorax is shorter. Clypeus wide, quite triangular, trun- 

 cated at the extremity or appearing lightly bidentate, strongly 

 punctured. Body densely punctured and clothed with a gray 

 pile. Concavity of the metathorax dull, finely wrinkled, strongly 

 bordered ; its marginal ridges arcuate and quite strongly salient 

 at the summit, where they almost form two little teeth separated 

 from the post-scutel by a fissure ; on each side there is formed 

 another dentiform angle, at times not very decided. Abdomen 

 short ; the first segment short ; almost as wide as the 2d. 



Insect black, much resembling in coloration the 0. campestris. 

 Antennas ferruginous beneath, with a yellow line upon the scape. 

 A dot upon the mandibles, four spots upon the clypeus, one on 

 the front, one behind each eye, a narrow border on the prothorax, 

 a spot beneath the wing, an interrupted bordering on the scutel, 

 and two arcuate spots upon the lateral ridges of the metathorax, 

 yellow. All the segments of the abdomen adorned with a narrow, 

 regular border; knees, tibiae, and tarsi yellow; these last often 

 ferruginous. Wings transparent, washed with brown in the 

 radial and along the nervures. Wing scales yellow, touched 

 with brown. 



Var. a. Clypeus yellow, with a black spot. 



6. Only four yellow borders upon the abdomen. 



c. Spots of the metathorax very small, occupying the base of 

 the ridges. 



d. No spots on the metathorax. 



%. A little smaller, stubbed. Mandibles, labrum, and clypeus 

 yellow; this last wide, rounded, and bidentate. Hook of the 

 antennae ferruginous, as well as the extremity of the flagellum 

 beneath. Border of the 1st abdominal segment often blended 

 upon the sides with a yellow dot ; femora yellow; feet almost 

 entirely yellow. Two yellow dots on the sides of the 2d segment. 



Var. a. No separate yellow dots upon the 2d segment. 



b. Scutcls black. 



Bess. a. diff. — This species can be recognized by the short first 

 abdominal segment, as wide as the 2d, and by the two yellow- 

 spots on the metathorax. But this last character being su 

 to be wanting, it is not advisable to give it too much importance. 

 One can distinguish this Odynerus from the 0. capra by its very 

 much smaller size and by its stubbed form: from the 0. Spinolm 



