124 HYMENOPTERA OF AMERICA. [l'ART I. 



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

 nidifieation lias been indicated before in the description of the 



genus. 



** Body quite Hack. 



17. ^3. niion-osa Sauss. — Nigro-cinerea; capite et thorace dense punc- 

 taii.s ; prohoto tenuiter marginato ; scutelli parte postica et post-seutella 

 sulco partitis; metauoto baud attenuate, valde excavato, argenteo birto, 

 utrinque convexo, rugato; al-domiue dense punctulato, cinereo seri- 

 cante ; pedibus auticis partial, ruandibulis, elypeo autennarumque seapo 

 subtu.s obscure femigiueis ; alis fusco-violaceis costa obscuriore. Long., 

 18-22 in in. 



9. Clypeo late piriformi, apice dentulis 2 invicem propinquis instructo. 



£. Clypeo breviore, longitudiue latitudiui subsequali, late eruarginato 

 deutibus 2 invicem distantibus instructo; antennaruui uuciuo rufo. 



Montezumia morosa Sadss. Vespides, I, 90, 6 (1852). 



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 Smith America. 



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

 indented, but only a little unequal. 



Hah. The eastern part of South America. Brazil. Guyana. 

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

 San-Andres-Tuxtla.) 



IS. M. Itlartliac n. sp — Nigra; post-scutello, metathorace abdomi- 



nisque IO segmento basi sulfureis; alis fusco-violasceutibus. 9 . 



Total lengtb, 17 mm. ; 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 sjiagreened; 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 



