28 HYMENOPTERA OF AMERICA. [PART I. 



post-oculavi, punctis 2 pronoti et scutelli, margine abdominis segmen- 

 toruui 10, 2°, coxis pe<libusque anticis, flavis. J . 



Total length, 12 mm. ; wing, 8j mm. 



Head moderate, moderately punctured ; the trenchant margin 

 of mandibles very obsoletely lobed. Thorax elongate and 

 depressed, polished, covered with delicate punctures, having a 

 tendency to striae, but the pleurae covered with stronger scattered 

 punctures, much attenuated anteriorly and posteriorly ; its ante- 

 rior margin short, margined ; the disk of the mesothorax flattened, 

 with two sulcose places at base ; scutellura flattened, not divided by 

 a sulcose basin, post-scutellum very small; metathorax elongate, 

 oblique, triangular, very coarsely punctured (or rather reticulate- 

 rugose) ; its lateral carinas very sharp, the sides under the carinae 

 polished, but a little reticulated near the carinae, posterior face 

 having two strong carinae, starting from the angles of the post- 

 scutel, the extremities of which do not meet the lateral carinae ; 

 the space between the middle carinae forming a square excavation, 

 rather widened posteriorly, polished, furnished with gray seri- 

 ceous hair, as also the terminal acute angles of metathorax, 

 behind the end of the middle carinae. 



Petiole (as in Olmeeus) cylindrical, truncate and polished in 

 front, extremely coarsely punctured, very rugose, a little carinated 

 at base, the extremity marked with a semicircular groove, and 

 also constricted on each side. Second segment of abdomen 

 rather elongate, a little depressed, with quite delicate oblique 

 punctures ; the punctures beneath stronger, on the base swelled 

 tuberculously ; the first margin above slightly angular in the 

 middle, the subjacent lamina very salient on the sides but very 

 little in the middle; margin of the 3d segment arcuate, the 

 lamellar edge strongly and broadly cut out in the middle. 



Black, furnished with silvery hairs (except on the head, where 

 they are yellowish;; a line of them behind the eyes (but not 

 marginal) and a line on the scape, yellow; the flagellum of ? be- 

 neath yellowish-ferruginous ; two dots on the prothorax, two on the 

 scutel, margin of petiole and a filiform line on the upper margin 

 of the 2d segment, yellow; prosternum, anterior coxae, and legs, 

 yellow; intermediate knees and tibiae annulated with yellowish- 

 brown. Wings washed with brownish, with a golden reflection. 



? . Clypeus in a rounded lozenge-shape, truncate at the top and 



