ODYNERUS. 281 



on each side of the middle. Legs yellowish ; the femora except 

 tips beneath, the tibia? beneath, and most of the tarsi, pale ferru- 

 ginous. Wings subhyaline, faintly tinged with fuscous ; honey- 

 yellow along the costa, with the marginal cell almost entirely 

 fuscous. 



Hess. a. diff. — Allied to 0. cubensis, by its livery, but the face 

 is much broader, and the basal segment of the abdomen is 

 differently marked, rounded anteriorly, not truncate, with a sharp 

 edge. It differs also by its hooked antennae, in the male. 



I do not know this Odynerus, which seems most closely allied 

 to 0. spectabilis, but much larger. Compare this species. 



Hab. Cuba (Mus. of the Am. Ent. Soc, Philadelphia). 



2. Posterior plate of melathorax orbicular or more or less 

 rounded, not forming on each side a distinct dentiform 

 angle. 1 (Thorax rather attenuate posteriorly, al>clomcn 

 conical or ovate-conical.) 



A. Posterior plate of metathorax still margined with a sharp 

 edge, salient in its superior part, and forming on each side 

 of the summit a tooth or elevation, separated from the post- 

 scutel by a fissure (sometimes very small). 



a. The concavity deep, excavated, with salient ridges. Abdomen conical; its 

 base sharply truncate. 



lOO. O. t?ll*pis Sauss. — Niger, thorace crassissime punctato ; clypeo 

 lato, piriformi; metanoto attenuate), extus rugosissinio, postice in fove- 

 olam ovalem valde excavato, lsevi, hand biangulato, sed canthis arcuatis 

 acutis marginato, nonnunquam supia paeiie dentem post-scutellarein 

 efficientibus ; abd. 2' segmenti margine punctato sed baud impresso ; 

 clypeo sum mo maculis 2 vel fascia, orbitarum marginibns parti m, 

 macula frontali, scapo subtns, pronoti et abd. segmentorura l'-4' margine, 

 macula subalari, tegulis, scutelli et metanoti maculis 2, post-scutello 

 pedibusque, aurantiacis ; alis ferrugineo-fnsco nebulosis. 



Odijn. ttifpis Sauss. Revue, Zool. XXII, 1870, 60, 17, 9. 



Total length, 13 mm. ; wing, 11 mm. 



1 Sometimes there is still an indication of two angles or eveii a small 

 tooth (0. foraminatus, 0. leucomelas), in the species in which the poste- 

 rior plate of metathorax is more or less angulate. 



