GAYELLA — ZETHUS. 13 



Gen. GAYELLA Spin 



Mandibles forming a beak by their union; labial palpi com- 

 posed of four articles ; maxillary, of six. First segment of the 

 abdomen contracted iu the form of a kuob or an inflated disk. 



1. Gayella eumenoides Spin. 



Gayella eumenoides Spinol. Gay's Fauna Chilena (Hist, fisica de Chile), 

 Zool. VI, 1851, 333, 1, pi. ii, fig. 2.— Sauss. Vespides, I, 1852, G, pi. 

 viii, fig. 4. 



Bab. Chili. 



II. THE NORMALIPENNES. 



The two recurrent nervures received by the second cubital 

 cell. 



Legion I. The Zethites. 



Mandibles short, obliquely truncated at the extremity, with 

 teeth placed on the oblique border of the truncation, and so rather 

 terminal than lateral (vide Saussure, Vespides, I, pi. ii, lc, 3c; 

 pi. iii, lc, 3c) ; forming by their union an obtuse beak. 



Gen. ZETHUS Fabr. 



Mandibles short, obliquely truncated, and in general armed 

 with teeth placed on the oblique terminal border. Lip and jaws 

 lengthened ; labial palpi composed of 3-1 not feathery articles; 

 the maxillary, of 6. 



Head large, expanded, in general wider than the thorax, dis- 

 coidal or wider than long, swelled behind the eyes and emarginate 

 like an arc of a circle on its posterior face. Antennas inserted 

 in the middle of its height. Clypeus rounded or in a large 

 square, in general wider than long. 



Iliorax slightly contracted before, sharply truncated on its 

 anterior extremity, so that there is a space in the form of a 

 circle between the head and anterior border of the prothorax ; 

 this last generally flanged, carrying a crest in form of a sharp 

 plate or edgs. 



