1899.] NATURAL SCIENCES OF PHILADELPHIA. 407 



CONTRIBUTIONS TO A KNOWLEDGE OF THE HYMENOPTERA OF BRAZIL, 



No. 7-EUMENID^ (GENERA ZETHUS. LABUS. ZETHOIDES, 



EUMENES, MONTEZUMIA AND NORTONIA.) 



BY WILLIAM J. FOX. 



The present paper, the seventh of the series dealing with Mr, 

 H. H. Smith's collections, relates to the solitary Ava.sps, and is 

 presented in incomplete form in consequence of the want of 

 available time for entomological work on the part of the writer. 

 These pages were written almost a year ago, and laid by with the 

 hope of soon working out the material of the genus Odynerus 

 thereby completing the Eumenidse of the collection, which hope, 

 however, has not been realized, beyond the drawing up of several 

 descriptions of new species Avhich will be included in a separate 

 paper on that genus. 



A. Pedicel of second segment shorter than width of first seg- 

 ment at apex, 

 a. Postscutellum entire. 

 Zethus caeruleopennis Fabr. 



Chapada, Febi'uary, March, December; Santarem. Seven 

 ?, five (f specimens. 

 Zethus recurvirostris DeG. 



A large series of both sexes. Chapada, January, March, 

 December. 



The color of petiole and legs varies from entii-ely red to black. 

 The swelling of the petiole is much greater in some specimens than 

 in others. 

 Zethus gigas Spin. 



Chapada, February, March. Twenty-five 9, three cf speci- 

 mens. 



There is a remarkably abnormal specimen of this species in the 

 collection. It is a d^, and has the petiole produced into two long 

 acute spines on the ventral surface laterally, that on the right 

 side placed some distance in advance of the other, The occiput 

 is emarginate medially, and that portion of the front filling the 



