40 HYMENOPTEKA. 



A. Metanotum not trisulcate, or with a V ' -shaped depression, impunctate, and not 

 striated or furrowed at the base. (Species 1-9.) 



i. Large, entirety black species, with black wings, more or less carinate 



clypeus, and whitish tarsi. 



^ 1. Trypoxylon albitarse. 



Trypoxylon albitarse, Fabr. Syst. Piez. p. 180 ; Dahlbom, Hymen. Eur. i. p. 286 ; Lepel. de St.- 

 Fargeau, Hist. Nat. Ins. Hym. iii. p. 228, t. 27. f. 3 ; Saussure, Reise d. Novara, Hymen, p. 76. 

 Trypoxylon albitarse, var. mewicana, Saussure, loc. cit. p. 72. (Mandibles red.) 

 Trypoxylon politus , Say, Bost. Journ. Nat. Hist. i. p. 37 1 ; Complete Writings, ii. p. 756. 



Hab. Noeth America, Indiana *. — Mexico, Presidio (Forrer) ; Guatemala, El Reposo, 

 Zapote, San Geronimo, Lanquin, Cubilguitz (Champion) ; Nicaragua, Chontales (Belt) ; 

 Costa Rica, Cache (Bogers) ; Panama (Boucard). — South America, Brazil. 



A common and widely-distributed species in the New World. The mandibles vary 

 from black to red, and the pubescence from blackish to dull fulvous on the thorax. 



^ 2. Trypoxylon cinereum. (Tab. IV. figg. l, la; lb,<s.) 



Nigrum, cinereo-hirtum, facie et clypeo argenteo-pilosis ; clypeo transverso, non carinato ; metanoto trans- 

 verse striato ; tarsis posticis luteis ; alis fuliginosis. d 1 $ . 

 Long. 15-18 millim. 



Hab. Mexico, Presidio (Forrer), Valladolid in Yucatan (Gaumer) ; Guatemala, 

 Mirandilla 1700 feet (Champion). 



In coloration similar to T. albitarse, but readily distinguished from it by the clypeus 

 not being keeled (only projecting roundly at the apex), the body covered with long 

 cinereous hair, and the front, face, and clypeus bearing a dense silvery pubescence. 

 Eyes touching the base of the mandibles, the latter piceous towards the middle. Front 

 and vertex opaque, coriaceous, covered with long hair, which varies in colour from 

 fuscous to cinereous ; a moderately deep suture on the front in the centre. Pro- and 

 mesothorax covered with shallow punctures ; metanotum closely transversely striated, 

 except at the base, and (especially at the top) depressed in the centre. The pubescence 

 on the mesonotum is dull cinereous ; that on the pleurae is longer and more silvery ; 

 on the metathorax it is still longer. There is a perpendicular patch of silvery pile 

 below the tegulee, on either side of the postscutellum, and on the sides of the pro- 

 notum behind. The abdomen is longer and more slender than in T. albitarse; the 

 petiole is more slender, and becomes gradually thickened towards the apex, w.hich is 

 tumid above ; and the apical segments bear a short sparse pile. The wings are not so 

 deeply coloured as in T. albitarse, and are lighter towards the base and apex. The 

 pleural suture is deep and wide. The hind tarsi are black at the base and apex. The 

 legs are more slenderly built than in T. albitarse, and the hind tibiae are not so dilated 

 at the apex. There is no furrow on the front or vertex; the eyes at the top are 

 separated by about the length of the third antennal joint. 



