322 HYMENOPTERA OF AMERICA. [PART I. 



Slender. Head and thorax coarsely eribrose, Prothorax 

 slightly contracted and angulate. Post-scutel short, having no 

 rido-e but its nosterior part receding backward making for it a 

 sort of hinder face. Metathorax a little produced backward 

 beneath the post-scutel and sharply truncate vertically. Its 

 hinder face excavated, coarsely eribrose; the concavity margined 

 superiorly by an angulated edge under the post-scutel; no lateral 



angles. 



First abdominal segment bell-shaped, anteriorly rounded-trun- 

 cate quite coarsely punctured, anteriorly roughened, reticulate; 

 second segment very little wider than the first, shallowly and 

 more finely punctured. 



Black. 'Mandibles rufous. Antenna? orange; the scape yellow 

 anteriorly, extremity of flagellum black. Clypeus, a triangle on 

 the forehead, inner orbits of the eyes, and a macula behind them, 



vellow. 



Antennas yellow at base (probably black at tip?). Anterior 

 part of metathorax yellow. First segment of the abdomen yellow 

 above, with a trident ate black emargination. Second segment 

 broadly margined with yellow and adorned with two free yellow 

 spots. Segments 4, 5 above with an incomplete yellow fascia. 

 Anus yellow. Feet yellow, or partly ferruginous, coxa3 black or 

 spotted with ferruginous. Wings washed with ferruginous ; the 

 apex cloudy ; the radial cell with a brown cloud. 



?. Clypeus pyriform, its apex slightly truncate, excavated. 

 %. Clypeus slightly bidentate, yellow; mandibles yellow. 



Bess. a. cliff. This much ornamented species is characterized 



by the peculiar form of its metathDrax ; its livery recalls various 

 species of the Antilles: such as 0. spedabihs, which is distinct 

 by its strongly angulated metathorax; Ancistrocerus Pocyi and 

 obliquus, both distinguished by the abdominal suture ; 0. cubensis, 

 distinct by its conical abdomen, not slender cylindrical-ovate as 

 in 0. bacuensis, and by its metathorax truncate on the same plane 

 with the post-scutel, etc. 



Hab. Cuba, 1 9 sent to me .by Dr. Gundlach. 



123. O. pedestris Sacss. (Fig. 22, 22a. )-0. conformi simillimus.at 

 priino abdominis seguiento minore, utriuque immaculate 



