140 HYMENOPTERA OF AMERICA. [PART I. 



metathorax small, very strongly and densely punctured, offering 

 in the middle a little excavation, distinctly striate. Abdomen 

 smooth, shining; the first segment funnel-shaped, subcampanu- 

 late, subpediculate, bidentate, strongly punctured and divided 

 above by a distinct groove ; border of the second and following 

 segments densely punctured; the margin of the second and third 

 slightly upturned. 



Insect black, shining. Antennas ferruginous beneath. Wing 

 scales ferruginous, at times marked with yellow. A point behind 

 each eve, a mark on middle of prothorax and border of segments 

 1, 2, yellow; the border of the first enlarged in the middle; 

 border of third segment piceous; tibiae and tarsi yellow. Wings 

 of a transparent brown, with beautiful violet reflections. 



% . Clypeus wide, truncate, yellow. A mark on the front and 

 a line on the scape of antennae, yellow; their hook ferruginous; 

 the third abdominal segment often bordered with yellow. 



Var. No spot on the front, nor yellow border on the second 

 abdominal segment (Florida). 



Hab. The eastern United States, Florida, New York, Con- 

 necticut (3 ? , 3 % , E. Norton). 



3. M.Tolteca n. sp. (Fig. 13, 13a.) — Ferruginea, fulvo-hirsuta, sparse 

 punctato-cribrata; clypeo bidentato; tliorace 9 dilatato, latissimo, 

 maximo, depresso ; % normali ; abdoinine velutino, punctato, primo 

 segtnento infundibulifornii, supra linea iinpressa partito; secundo duplo 

 latiore, margine reflexo ; antennis ultra 4 m articulum supra uigris ; alis 

 ferrugineis, frequenter cyanescentibus. 



Variat. Vertice, mesonoto, thorace subtus, abd. segmentis basi, riigris ; 

 segraentis flavo-limbatis ; corpore flavo maculato. 



£ . Minor ; clypeo polygonali, flavo ; anteuuarum unciuo ferrugineo. 



9 . Total length, 22 mm. ; wing, 17 mm. 

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



?. Insect very stout, wide and depressed. Labial palpi com- 

 posed of four articles; the fourth quite small; the maxillary, of 

 six articles, the 2d and 3d long and slender; the last three small. 

 Clypeus pyriform, wide, punctured, offering two little obtuse 

 mammilla?; its inferior margin thinned, armed with two little 

 separated lamellate teeth. Between the antennae is a transverse 

 carina, almost forming a little tubercle. Thorax strongly de- 

 pressed, very wide, much wider than high, wider than the abdo- 

 men. Scutellum and post-scutel flat and depressed; metathorax 



