ODYNERUS. 311 



nearly forming on each side a sort of angle, acutely marginate 

 superiorly in an arc of a circle ; the margin rough, slightly 

 elevated behind the post-scutel, crenulate, separated from post- 

 scutel by a fissure. Abdomen cylindrical ; the first segment 

 rather elongate, anteriorly rounded-truncate. 



Black, shining; mandibles, apex of the tarsi, and antennas 

 beneath, ferruginous ; a line on the scape beneath, a frontal and 

 post-ocular spot, anterior margin of prothorax, two spots on the 

 margin of the tegulas, post-tegulse, one or two spots under the 

 wings, a line on post-scutel, and the margin of the first two abdo- 

 minal segments, luteous. Feet black. Wings subhyaline, the 

 nerves brown. 



Eess. a. dijf.— It much resembles Ancistr. scabriusculus, but is 

 distinct by its abdomen, without suture. 



Bab. Chili (Museum of Vienna). 



C. Form not very slender. Metathorax produced horizontally 

 beyond the post-scutel; then vertically truncate ; the r post- 

 scutel quite enveloped by it posteriorly , not reaching up to 

 the edge of the posterior face of metathorax ; the posterior 

 face of metathorax superiorly terminating in an erect crest, 

 parted by a fissure. Vertex in 9 having two pilose tubercles. 



This type is in the Stenodynerus, the corresponding represen- 

 tative of the type of A. i-sectus, in the Slenancistrucerus. It 

 has also the metathorax prolonged and the vertex armed with 

 two pilose tubercles. But the abdomen, although polished in the 

 same way, is much contracted at base. 



114. O. luctuosus Sauss. — Validus, ater, rugosns, nigro pilosus ; 

 clypeus piriformis, paulum punctatus, apice paulum emarginatus, bi- 

 dentatus. Caput et thorax crasse punctata, rugosissime secundum 

 loiigitudinein elevato-strigata ; vertice cirris 2 pilorum nigrorum in- 

 structo, pronoto ciistato-marginato, angulato ; scutello lsevi, nitido, 

 sparse punctato ; post-scutello depresso, integro; metathorace rngo- 

 sissimo, transverse elevato-striato, nee non utriuque subtns aronato- 

 strigato, velutiuo et longe nigro- vel cinereo-piloso, pone post-scutellum 

 producto, dein truncato ; postice tantum in medio foveolato, grosse 

 strigato; sed in summo, supra foveolam in cristulam producto, trans- 

 versam crenatam, in medio divisam. Abdomen nitidissimum, sparse 

 punctatum ; primo segmento basi truncato valde angnstiore quam se- 

 cundum ; secundo supra in tuberculum turaescente. — Linea mandibu- 

 larum, inaculse 2 laterales clypei, linea in antennarum scapo et maculae. 



