0DYNERUS. 200 



its abdomen, recalling, with exaggeration, the African 0. canalv- 

 culatus. 



Hob. The temperate part of Mexico. Orizaba (11, Sumi- 

 chrast). 



B. Metaihorax triangular, narroned posteriorly, not so m>>rh 

 excavated, with sharp superior ridges. Post-scutel not 

 crested. Second abdominal segment channelled and rejlexed, 

 scarcely swollen. 



lllo ©. Moire! M Sauss. — Niger, dense pnnctulatus, fulvo-tomentosus ; 

 pronoto angulato; metatborace haud angulato, foveola postica canthis 

 acutis superne marginata; abdominis primo segmento minore, margine 

 elevato ; sectindi margine rugoso, valde canaliculate- valde reflexo; 

 antennis basi fevrugineis ; ore, orbitis et verticis fascia arcuata, pronoto, 

 macula subalari, tegulis, scutelli margine, metanoli can this, pedibus 

 abdomineque, ferrugineis ; segmentorum margine obscure flavo ; seg- 

 ments 1°, 2° basi nigris ; alis dilute infuscatis, in costa ferruginea. — 

 % . Clypeo rotundato, transverso, flavo ; argenteo-tomenloso ; vertice 

 tuberculo polito obsoleto instructo. — £ . 



Odjjn. Morelos Sadss. Rev. et Mag. de Zool. IX, 1857, 276, % . 



Total length, £ , 12 mm. ; wing, £ , 10 mm. 



% . Head rather swelled transversely at the occiput or behind 

 the eyes. Vertex a little hollowed, or with a double, polished 

 low tubercle behind the ocellae, and between this and the ocellse, 

 a sort of arcuate depression, often obsolete. Thorax short ; pro- 

 thorax quite squarely cut, its angles sharp, but not produced. 

 Post-scutel quite shortly truncate, linear, transverse, insensibly 

 depressed in the middle; but not edged nor crenulate; its hinder 

 face elevated. Metathorax rather narrow; its upper face on each 

 side convex; its hinder face rather triangular, forming each side 

 almost a blunt lateral angle; the excavation margined superiorly 

 on each side under the post-scutel by a sharp arcade or arcuated 

 edges, very salient, like a sharp crest, but not erect, forming do 

 teeth whatever behind the post-scutel. Abdomen constricted at 

 base of the second segment; the first segment very small, much 

 narrower than the second, truncate and rounded at base; its 

 margin a little edged. The second segment very strongly cana- 

 liculate along its margin; the channel widened in the middle and 



