TKYPOXYLON. 47 



segment covered with short fulvous pubescence ; the petiole and second segment almost 

 glabrous above, the sides with short cinereous pile. Petiole tuberculate laterally near 

 the base ; above with a narrow, shallow furrow, which barely reaches to the middle. 

 The second segment is raised at the base, of nearly equal width throughout (but, if 

 anything, thicker towards the apex), and very little longer than the third segment. The 

 apical segment is broadly keeled in the middle above. Legs densely pruinose ; the 

 anterior and intermediate spurs, and the middle of the intermediate and posterior tarsi 

 broadly luteous. The hind coxae are large, obliquely keeled and hollow above, and end 

 laterally in a short blunt tooth ; the spine on the trochanter is rather long, being fully 

 half the length of the basal joint of the trochanter. 



E. Metanotum with a curved furrow on either side of the basal half and usually 

 with one down the centre as well. (Species 16-20.) 



S 16. Trypoxylon cornigerum. 



Nigrum, opacum, punctatum, mandibulis, tibiis tarsisque anticis runs ; metanoto striolato, bicanaliculato ; alia 



hyalinis. 

 Long. 11-12 millim. 



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



Antennae covered with pale down, the basal three fourths rufous beneath ; the third 

 joint about one fourth longer than the succeeding one. Clypeus thickly, the inner 

 orbits and the eye-incision sparsely, clothed with silvery pubescence ; the rest of the head 

 sparsely pilose. Front and vertex opaque, coarsely aciculate. Eyes at the top separated 

 by a little less than the length of the second and third antennal joints united, below by 

 about the length of the third. Ocelli in a triangle, the posterior two in a depression. 

 Front convex, with an indistinct furrow in the centre. Above the antennae is a broad 

 projection, with a rounded apex. Clypeus sharply projecting at the apex, the apex 

 rounded, smooth, and shining. Mandibles testaceous. Thorax opaque, alutaceous; 

 the sternum sparsely, the sides of the metanotum thickly, covered with silvery-white 

 hair. Metanotum obliquely striolated ; the apex semioblique ; a V-shaped furrow in 

 the middle, the portion of the furrow on the apical oblique part being wider than the 

 fork; there is also a shallow indistinct furrow down the centre of the basal part. 

 Abdomen sparsely pilose ; the first segment about one fourth longer than the second. 



^ 17. Trypoxylon chichimecum. 



Trypoxylon chichimecum, Saussure, Reise d. Novara, Hymen, p. 83, t. 4. figg. 48, 48 b, c \ 

 Hab. Mexico 1 . 



This species is stated to occur in elevated districts, in the valley of the city of 

 MExico \ 



