ODYNERUS. 205 



the first having on each side a lateral emarginate yellow spot. 

 Anus, knees, tibiae, and tarsi, and a spot on the intermediate 

 coxos, yellow. The yellow ornaments rather orange-yellow. 

 Wings ferruginous at the base, smoky at the extremity. 



Var. ? The first abdominal segment narrowly margined. 



?. Clypeus broad, a little bidentate at tip, strigate punctate, 

 black, with a yellow arc on the summit, and two rufous lines 

 over the teeth. 



Bess. a. diff. — Resembles 0. nasidens, diabolicus, argentinus, 

 and neighbors, but the abdomen is not so conical, the first seg- 

 ment not so broad, the body not velutinous as in the first, the 

 metathorax not spined as in diabolicus, the thorax not so square, 

 short, and wide as in argentinus, the head concave behind, the 

 prothorax rather convex anteriorly. It has also something of 

 the hook of 0. La Platse, but the metathorax is not so margined 

 superior])- by arched ridges. In its' livery it differs from all of 

 these. This recalls more 0. zonatus, which differs from it in the 

 same characters as 0. La Platse, etc. — Comp. 0. formosus. 



Hab. Mexico. The Cordillera of Cordova (1 ?, Sumichrast). 



B. Metathorax as in Section A, but the superior edges of its 

 hinder plate not so much elevated, no longer forming, in the 

 females, distinct teeth behind the jjost-scutel, nor even eleva- 

 tions separated from post-scutel by two fissures. Its edges 

 still rather distinct, linear. 



a. Metathorax excavated ; edges straight. 



89. O. Iturbidi Sauss. (Fig. 15, 15a.)— Validus, valde punctatus ; 

 post-scutello crenulato, metanoto perrugoso, utrinque angulato, margi- 

 nibu.s superis rugosis, canthis obliterates, vix perspicuis; abdominis 

 secundi segtueuti margine profuude canaliculato, et valde rugoso. 

 Caput et thorax nigra; ore, clypeo. orbitis partim, macula frontali, 

 antennarum articulis 1-4, pronoto, macula subalari, scutellis, tegulis, 

 metanoti angulis pedibusque, ferrugineis ; abdomine ferrugineo, seg- 

 meutis ochraceo-ruargiuatis ; primo et secuudo basi iucisura nigra; alis 

 ferrugineis. 



% . Clypeo polygonali, truncato, integro ; frequenter flavo. 



Odyn. Iturbidi Saoss. Rev. Zool. IX, 1857, 276, % . 



Total length, 15 mm. ; wing, 12 mm. 



Size and form of 0. Boscii. Head and thorax cribrose with 

 coarse punctures. Post-scutel strongly crenulate. Metathorax 



