tetpoxylon; 46 



is a perpendicular silvery stripe down from the tegulae, a patch on either side of the 

 postscutellum, and another on the sides of the middle segment. Middle segment with 

 a deep V-shaped depression in the centre, extending to the apex. Pleural suture 

 wide, deep, and oblique. Abdomen shining, covered with silvery and golden pile, which 

 is especially thick on the sides and bases of the segments. Petiole dilated towards the 

 apex, the extreme apex, however, being narrowed ; first segment becoming gradually 

 (but slightly) thickened towards the apex and petioliform, the other segments much 

 thicker than it and together forming an elongated ovoid. 



^13. Trypoxylon fusciventre. 



Nigrum, f qlvo-hirsutum, tibiis, medio tarsorum abdomineque testaceis aut fuscis ; alis hyalinis, nervis rufo- 



testaceis. § . 

 Long. 13 millim. 



Hdb. Mexico, Temax in North Yucatan (Gaumer). 



Antennae rufous beneath towards the apex, microscopically pilose ; the third joint 

 about one quarter longer than the fourth. Head coarsely rugose, except behind the 

 ocelli, where it is only aciculate. Eyes at the top separated by the length of the second 

 and third antennal joints united, at the bottom by scarcely the length of the third. 

 Ocelli in a triangle ; the vertex slightly depressed in the middle behind them ; front 

 convex, without a furrow. Clypeus projecting at the apex and with a narrow incision 

 in the middle. Mandibles piceous. Above the antennae and on the clypeus are some 

 scattered longish silvery-white hairs. Thorax shining, above with shallow punctures ; 

 the metanotum transversely striated. There is a band of pale hair on the pronotum, 

 one across the postscutellum, and another on the sides of the metanotum, and the 

 pleurae bear scattered hair. There is a shallow V-shaped depression on the centre of 

 the metanotum. Abdomen clavate from the third segment ; the petiole clavate at the 

 apex and a little longer than the second segment. The legs are for the greater part 

 piceous ; the three middle joints of the hind tarsi are obscure yellow, and the four 

 front tarsi obscure testaceous ; the spurs are dark fuscous. 



I am not sure but the piceous colour of the abdomen and legs may be owing to 

 immaturity, as in one specimen these parts are much darker. 



v 14. Trypoxylon sonorense. (Tab. IV. fig. 7.) 



Nigrum, argenteo-fulvum, punetatum ; apice petioli, abdominis segmento 1° basique 2° runs ; alis fere hya- 

 linis, apiee fumatis ; tegulis testaceis. 

 Long. 13-16 millim. 



Hdb. Mexico, Northern Sonora {Morrison). 



Face, front, orbits, and clypeus densely covered with silvery pile ; clypeus slightly 

 convex, not carinate, the apex with a slight incision in the centre. Front and vertex 

 strongly coriaceous, the former with an indistinct furrow in the centre, scarcely 



