28 HYMENOPTERA OF AMERICA. [PART I. 



post-ocnlari, punctis 2 pronoti et seutelli, margine abdominis seguien- 

 toruiii L°, 20, coxis pe<libusque anticis, flavis. $?• 



Total length, 12 mm. ; wing, S? nam. 



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 stria', Inn the pleurae covered with stronger scattered 

 punctures, much attenuated anteriorly and posteriorly; its ante- 

 rior margin shorl , 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 carina 1 very sharp, the sides under the Carinas 

 led, but a little reticulated near the carina?, posterior face 

 having two strong carina', starting from the angles of the post- 

 scutel, the extremities of which do not meet the lateral carina'; 

 the space between the middle carinas forming a square excavation, 

 rather widened posteriorly, polished, furnished with gray seri- 

 ceous haii-, as also the terminal acute angles of metathorax, 

 behind the end of the middle carina'. 



Petiole (as in Olmecus) 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 

 puncture.-; 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) ami a line 01; the scape, yellow; the flagellura 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 -_'d segment, yellow; prosternum, anterior coxae, and legs, 

 yellow; intermediate knee, and tibiae annulated with yellowish- 

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



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



