306 WHEELER. 



together. Thorax small and short, only a little longer than the head 

 with the mandibles and much narrower; seen from above as broad 

 through the pronotum as through the epinotum, but distinctly nar- 

 rowed at the mesonotum. Pronotum as broad as long, feebly convex 

 and rounded above, somewhat flattened on the sides, but expanded 

 ventrally. Promesonotal suture obsolete, but represented by a 

 pronounced, lunate groove. Mesonotal stigmata elevated as strong, 

 rounded tubercles. Mesonotum a little longer than broad, its dorsal 

 surface in the form of two longitudinal welts, separated by a groove 

 which does not extend to the lunate promesonotal groove. In profile 

 the dorsal outline of the mesonotum is slightly convex in front, then 

 straight and sloping backward, and finally abruptly vertical to the 

 low metanotum, which is distinct and transverse, short and bounded 

 by distinct, straight mesometanotal and metaepinotal sutures. 

 Metanotal stigmata small, tubercular. Epinotum broader than long, 

 from above transversely oblong, its base in profile convex and rounded, 

 rising high above the metanotum, its declivity concave. Seen from 

 above the base is divided by a deep longitudinal furrow into two parts, 

 each of which is very convex and terminates behind in a strong, blunt 

 projection. Sides of epinotum somewhat flattened, with very large, 

 slit-shaped stigmata. Petiole very large, much higher than long, 

 broader than the epinotum and nearly twice as broad as long, repeat- 

 ing the shape of the epinotum in a more exaggerated form. It bears 

 above two large, erect horns, which curve upward and backward and 

 are as high as the pronotum and terminate in blunt points. Between 

 these horns the dorsal surface of the petiole is deeply and broadly 

 concave. Ventral surface of petiole smooth and nearly straight in pro- 

 file, without a tooth or projection. Gaster very large, in life fully 6-7 

 mm. broad, very convex above and concave beneath, in profile elongate 

 elliptical, the first segment somewhat truncated anteriorly and with 

 a pair of feeble impressions to receive the tips of the petiolar horns. 

 Stigmata on the various segments very large, slit-shaped. Hypopy- 

 gium terminating in two broad triangular points separated by an 

 angular excision; pygidium convex, its posterior border evenly and 

 broadly rounded, entire. Sting short and robust, but exserted. Legs 

 long and stout; claws well-developed, dentate. 



Surface nearly opaque and very finely, densely and evenly punctate, 

 or granular, except the mesopleurse, sides and declivity of epinotum, 

 the whole of the petiole, coxse, venter and anterior portions of the 

 gastric segments, which are shining and very finely and superficially 

 shagreened. Head and dorsal portion of thorax covered with sparser, 



