130 HYMENOPTERA OF AMERICA. [PART I. 



orbitis ferrugineis ; mesonoti disco nigro, signaturis 2 rufis ; abdominis 

 segmentis basi nigris; pronoti et abdominis segmentorum 1-2 margine, 

 tegulis, scutellis, tibiis et tarsis, flavis ; alis fumosis. 

 Montezumia Californica Sadss. Revue de ZooL, xv, 1863. 

 Total length, 18 mm. ; wing, 13 mm. 



% . The slender and lengthened form of Montezumia, but the 

 abdomen more truncate at its base. Head rather small. Thorax 

 very little retracted before or behind; metathorax squarely cut, 

 scarcely prolonged behind the post-scutel; its posterior face 

 truncate, excavated in almost all its width, occupied by a vertical 

 furrow, smooth and shining, slightly striate from the middle 

 downward ; armed on each side with a strong spiniform tooth ; 

 the inferior borders of the concavity quite trenchant, but the 

 superior, situated above the spines, completely rounded and 

 effaced. Scutellum and post-scutel separated by a deep groove 

 and divided by a longitudinal groove; the post-scutel rather 

 carinated. Head and thorax sjnooth, covered with finely punc- 

 tured spots, the metathorax more strongly punctured. Abdomen 

 lengthened, but subsessile; the first segment wide, rounded- 

 truncate at its base, but still less wide than the 2d, which is longer 

 than wide. All the segments having their posterior border 

 divided by a little longitudinal groove. 



Insect of a bay-ferruginous, with satin-like, slightly glaucous 

 reflections. Clypeus (%) convex, polygonal, a little notched in 

 the arc of a circle and armed with two angular teeth. Front and 

 vertex black, but a spot above the insertion of the antennoe yel- 

 low. A space behind the eyes and the complete border of the 

 orbits orange-ferruginous; the two lines which border the summit 

 of the eyes unite on the posterior part of the vertex, forming a 

 horseshoe. Mouth and antenna? ferruginous ; these last a little 

 obscure above in their second moiety and nearly to the end. 

 Thorax varied with black beneath and along its sutural lines ; 

 disk of the mesothorax black, with a double ferruginous spot ; a 

 little black at the bottom of the concavity of the metathorax and 

 at the base of the abdominal segments. Wing .scales, post-scutel, 

 and margin of the first two abdominal segments, yellow; the 

 border of the second a little festooned and narrow in the middle; 

 the border of prothorax and of the other segments also a little 

 yellow. Legs ferruginous, with the tibiae and tarsi yellowish. 

 Wings smoky, with slight violet reflections. 



