124 HYMENOFTERA OF AMERICA. [PART I. 



This is a distinct species, remarkable by its slender body. Its 

 nidification 1ms been indicated before in the description of the 

 genus. 



** Body quite Hack. 



If. 3f. ESlorosa Sadss. — Nigro-cinerea ; capite et tliorace dense punc- 

 taiis ; pronuto tenuiter marginato ; scutelli parte postica et post-seutello 

 sulco paitilis ; metauoto baud attenuate, valde exeavato, argenteo -hirto, 

 utrinque convexo, rugato ; abdomine dense punctulato, cinereo seri- 

 cante ; pedibus anticis partim, maudibulis, clypeo autenuaruinqae scapo 

 subtus obscure ferrugineis ; alis fusco-violaeeis custa obscuriore. Long., 

 18-22 mm. 



9- Clvpeo late pirifotmi, apice dentulis 2 invicem propinquis iustructo. 



% . Clypeo breviore, longitudine latitudiui subsequali, late euiarginato 

 dentibus 2 iuviceui distantibus iustructo; anteuuaruui uuciuo rufo. 



Montezumia morosa Sadss. Vespides, I, 90, 6 (1S52). 



This species is characterized by its black body, with gray-silky 

 changes, but without violet-green reflections. The wings are 

 more or less obscure, with more or less of violet changes. The 

 metathorax is rather broad, not attenuated; the prothorax not 

 much angulated. The abdomen is subsessile, the first segment 

 bell-shaped with a little groove on its superior side. 



A male specimen from Mexico, which I cannot separate from 

 this species, has the thorax a little larger than the specimens 

 from South America, 



The inner edge of the mandibles of the male is not lobed nor 

 indented, but only a little unequal. 



Hab. The eastern part of South America, Brazil. Guyana. 

 Mexico. (I caught a male on the eastern coast of the guif, near 

 San-Andres-Tuxtla.) 



IS. M. Martliae n. sp. — Nigra; post-scutello, metatborace abdoini- 

 nisque 1° seguieuto basi suifureis; alis fusco-violasceutibus. J . 



Total lengtb, 17 ruui. ; wing, 15 mm. 



9 . Head and thorax much as in M. morosa. Clypeus covered 

 with longitudinal punctures; its inferior end formed by two little 

 teeth separated by a straight border. Head and thorax very 

 densely shagreened; metathorax short, much rounded. Abdo- 

 men very finely punctured, not so regularly fusiform as in morosa; 

 the first segment somewhat narrower compared with the second 



