74 HYMENOPTERA OF AMERICA. [PART I. 



rufous. Wings cloudy, iridescent; nerves and stigma blackish; 

 2d cubital cell as in E. regulus, as lung- as wide ; iis radial 

 margin broad. 



Var. a. Mandibles more ferruginous. Antennas dull ferrugi- 

 nous with an obscure line on the scape, and blaekibh on the 

 flagellum. 



b. Head black without ferruginous spots. 



c. Prothorax ferruginous. 



d. Post-scutel and tegube blaekish. 



e. Prothorax black, only the posterior border ferruginous. 



f. Angles of post-scutel, post-tegulae, and border of petiole 

 yellow. 



%. Smaller. Clypeus grayish-silky. Antennae with a little 

 ferruginous hook. The frontal spot, scape beneath, margin of 

 petiole yellow. 



Var. Prothorax black ; its hinder margin yellow ; post-scutel 

 yellow ; margin of the abdominal segments yellowish. 



Common variety. — Generally of small size. Body quite black; 

 scape and apex of the antennas beneath ferruginous. Posterior 

 border of prothorax, post-scutel, border of abdominal segment, 

 1st, 2d, yellow ; of the others dull-yellowish. Tegulae fuscous ; 

 feet partly ferruginous. Petiole not so much dilated posteriorly, 

 more pyriform than triangular. (5 9,2 % . Cordova.) 



Bess. a. diff. — A very distinct species by its large convex 

 thorax and strongly punctured abdomen. The head and thorax 

 are much as in Thoracicus, but the dorsum of the thorax is regu- 

 larly convex, not deformed. In the little varieties, the thorax 

 gets smaller, and the petiole narrower than in Begulus, but the 

 punctured abdomen always enables one to distinguish the species. 



Bab. Mexico; the Oriental Cordillera; Orizaba, Cordoba, 

 Moyoapam. (12 9, 6 % ) 



14. E. tlioracicilS n. sp. — Parvulus, niger fulvo-velutinus : thorace 

 sat valido, globoso, superne defonni, mesonoti disco sr.bbicarinato, 

 utrinque foveolato et subgibberoso, sparse cribrato-punctato ; abdomine 

 impunctato, petiolo postice piiiformi ; corpore obscure rufo-vaiiegato ; 

 scutellis rufis ; petiolo flavo-liuibato : alis nebulosis. 



9 . Total length, 10 mil 1 . ; wing, 8 mm. 

 %. Total length, mill. : ^ving, 7 mm. 



9. Head and thorax as in E. aviculus. Clypeus punctured, 

 but not bicarinate, and parted by a groove at tip; having the tip 





