ODYNEIIUS. 281 



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

 tips beneath, the tibiae 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. 



Bess, 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} (Thorax rather attenuate posteriorly, abdomen 

 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. tiiri>is Sauss. — Niger, thorace crassissime punetato ; clypeo 

 lato, piriformi; metanoto attenuato, extus rugosissimo, postice in fove- 

 olam ovalem valde exoavato, laevi, baud biangulato, sed can this arcuatis 

 acutis margiuato, nomiunquam supra paene dentem post-scutellarem 

 efficientibus ; abd. 2 1 segmenti margine pnnctato sed baud impresso ; 

 clypeo Biimmo maculis 2 vel fascia, orbitarum marginibns parti m, 

 macula frontali, soapo subtus, pronoti et abd. segmentorum l'—l' margine, v-e£^ 



macula subalari, tegulis, scutelli et metanoti maqulis 2, post-sontello , * ^° 



pedibusque, aurautiacis ; alis ferrugineo-fusoo nebalosis. v^o***"* 



Odyn. tuj-pis Saus?s. Revue, Zool. XXII. 1870, 60, 17, ?. 

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



V 



1 Sometimes there is Still an indication of two angles Of cv,-n a small 

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

 rior plato of metathorax is more or less angulate. 



