ODYNERUS. 299 



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

 culatus. 



Hab. The temperate part of Mexico. Orizaba (1 % , Sunii- 

 cbrast). 



B. Metathorax triangular, narrov.ed posteriorly, not so much 

 excavated, with sharp superior ridges. Post-scutel not 

 crested, .Second abdominal segment channelled and rejlexed, 

 scarcely swollen. 



111. 0. MoFeiii Sauss. — Niger, dense punetulatus, fulvo-tomentosus ; 

 pronoto angulato; nietathorace hand angulato, foveola postica canthis 

 acutis superne niarginata; abdominis priino segmento minore, margine 

 elevato; secnndi margine mgoso, valde canaliculato valde rellexo ; 

 antennis basi ferrugineis ; ore, orliitis et verticis fascia arcuata, pronoto, 

 macula subalari, tegulis, scutelli margine, metanoti canthis, pedibus 

 abdomineque, ferrugineis ; segmentorurn. margine obscure flavo ; seg- 

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

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

 tuberculo polito obsoleto instructo. — ^ . 



Odijn. Morelos Sauss. Rev. et Mag. de Zool. IX, 1S57, 276, % . 



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



% . Head rather swelled ti'ansversely at the occiput or behind 

 the e3 T es. Tertex a little hollowed, or with a double, polished 

 low tubercle behind the ocellse, and between this and the ocella?, 

 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 no 

 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 



