W HYMENOPTEKA. 



J 



18. Trypoxylon toltecum. 



Trypoxylon toltecum, Saussure, Reise d. Novara, Hymen, p. 83 \ 

 • Eab. Mexico, Orizaba. 1 , eastern cordillera 1 . 



V 19. Trypoxylon palliditarse. (Tab. IV. figg. 9, 9 a, I.) (i^.Scu^) -- tej****^ st*^ mo 



Nigrum, nitidum, palpis, geniculis tarsisque anterioribus albis; alis fere hyalinis, nervis nigris. " c f r****" n * ' "-*. 

 Long. 11 millim. 



Eab. Mexico, Teapa in Tabasco (E. H. Smith, March 1888). 



Antennas as long as the thorax, thickened towards the apex, the scape obscure 

 testaceous beneath ; the basal joints of the flagellum fuscous ; the third joint, if any- 

 thing, shorter than the fourth ; the fifth joint curved beneath ; the last joint hollowed 

 and narrowed laterally and as long as the preceding three joints united. Head shining ; 

 the front rugosely punctured, raised broadly in the middle, narrowed to a broad keel 

 immediately before the antennas, and with a broad furrow in the centre. Vertex 

 depressed behind the front ocellus, the latter placed in a hollow. Clypeus projecting 

 at the apex. The eye-incision, face, cheeks, and clypeus densely covered with silvery 

 hair. Eyes at the top separated by more than the length of the first and second 

 antennal joints united. Mandibles reddish at the apical half. Thorax shining, sparsely 

 punctured above ; the pleura? and sternum covered with rather long white hair, finely, 

 but distinctly punctured. The pronotum transversely furrowed in the middle above, 

 and there are two shallow furrows on the mesonotum. Metanotum with a wide and 

 deep central furrow and a curved narrower one on either side, these leading into a wide 

 and deep furrow in the apical part. The metapleuras are glabrous and slightly concave. 

 The abdomen is about one half longer than the head and thorax united ; shining, pilose 

 beyond the second segment, densely so at the apex, the latter fuscous above and beneath. 

 The spurs are all white ; the hind tarsi have the base of the first and the greater part 

 of the second and third joints blackish. 



The curved fifth antennal joint and the elongated and hollowed last joint are 

 characteristic of this species. 



^ 20. Trypoxylon rugifrons. . 



Nigrum, subopacum, argenteo-pilosum, vertice et fronte rugosis ; thorace punctato, metanoto striate ; spinis et 



basi tarsorum anterioribus albis ; mandibulis rufis ; tegulis albo-testaceis ; alis hyalinis. $ . 

 Long. 8 millim. 



Eab. Mexico, Vera Cruz (H. H. Smith, Jan. 1888). 



Antennas short, subclavate, densely covered with a microscopic down; the third 

 joint a little longer than the fourth ; the joints not clearly separated. Head opaque ; 

 above the antennae finely rugosely punctured ; the front broadly projecting ; the ocelli 

 in pits, a broad and shallow furrow leading down to them ; the front immediately above 

 the antennas in the centre projecting into a wedge ; eyes above separated by the length 



