322 HYMENOPTEllA OF AMERICA. [PART I. 



Slender. Head and thorax coarsely cribrose. Prothorax 

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

 ridge, but its posterior 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 cribrose; 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. Antennas 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, 

 yellow. 



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

 part of metathorax yellow. First segment of the abdomen yellow 

 above, with a tridentate 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, coxse black or 

 spotted with ferruginous. Wings washed with ferruginous ; the 

 apex cloudy ; the radial cell with a brown cloud. 



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



%. Clypeus slightly bidentate, yellow; mandibles yellow. 



Hess. 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. spectabilis, which is distinct 

 by its strongly angulated metathorax; Ancistrocerus Poeyi 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 ? sent to me .by Dr. Gundlach. 



123. O. pedestris Sauss. (Fig. 22, 22a.) — 0. conformi simillimus,at 

 primo abdominis segoiento minore, utrinque immaculato. 



