ZETHUS. 37 



Feet black; tarsi rather ferruginous. Wings transparent, clouded, 

 yellowish-brown, with the nervures brown — their reflection 

 golden-gray. 



£,. Anterior border of the clypeus notched as in the female; 

 the angles of the indenture in the form of teeth, the middle tooth 

 smaller than the lateral. All the clypeus covered with a silvery 

 down; its lower moiety of a yellow color, as well as a line upon 

 the scape of the antennas. Mandibles yellow in front, the end of 

 the antenna? black, the hook elongate, edged, and sharp ; the 

 terminal joints sometimes a little rolled up. 



liens, a. diff. — It is a little smaller than Z. Westwoodi, and is 

 distinguished from it by its more swelled and more coarsely punc- 

 tured petiole, by its more indented, more strongly punctured 

 clypeus, etc. It has the form of Z. spinostis, but it has no post- 

 seutellar spine, etc. ; and although rather coarsely punctured, 

 that is really less so than this species. 



Hab. Mexico, on the gulf side. Tampico. 



Fig. 1. The male enlarged. Fig. 1, a. The head of the male seen from 

 before. 



Observation. — The figure 1 is not entirely satisfactory: the heart not 

 sufficiently thick, and the second abdominal segment with the pedicle a 

 little too long. 



23. Z. Otoiilitlis n. sp. — Niger, dense punctatus ; capite et thorace 

 cinereo-, abdomine fulvo-hirto ; antennis nigris, scapo linea flava; 

 punctis 2 frontalilms, pronoti margine, fascia post-scutelli, abdominisque 

 segnientorum 1-3 linea marginali, flavis ; petiolo ovato-tnmido nitido, 

 puuctato, apice truncato, superne impressione transversali ; genibus et 

 tarsis fuscescentibus; alis fusco-aureo nebulosis. — £ clypeo trapezino, 

 fascia submargiuali flava. 



Total length, 14 mm. ; wing, 10 mm. 



%. Quite the same form and punctuation as Z. aztecvs. But 

 the clypeus not square, more triangular, wide inferiorly, narrowed 

 at the summit, or rather in the form of a half circle, a little con- 

 vex, densely punctured; the inferior margin wide and transverse; 

 with a wide transverse emargination and two little teeth. A pale 

 yellow band occupies the inferior part, but the extreme margin 

 is black. The flagellum of the antennas quite black; only the 

 hook is sometimes brown beneath. The lateral carinas of the 

 mctathorax a little more pronounced ; the petiole not so coarsely 

 punctate, a little wider behind, more truncate, somewhat as in 



