138 HYMENOPTEEA. 



narrowed rather sharply towards the apex, which is sub-bidentate ; eyes slightly diverging 

 beneath ; ocelli in a curve, an indistinct shallow furrow behind them ; the face, clypeus, 

 and orbits behind densely covered with silvery pubescence. Antennae subclavate, pilose ; 

 the third joint longer than the first, and about three-quarters longer than the fourth. 

 Mesonotum coarsely, longitudinally, rugosely punctured ; the pleurae punctured, but 

 not strongly ; the furrow on the mesopleurae distinct; scutellum sparsely punctured, 

 the metanotum more closely and strongly so ; median segment opaquely, closely rugose, 

 densely covered with long silvery hair, the basal area shining, laterally at the base 

 stoutly, longitudinally striolate, the centre at the base with two stout converging keels, 

 the rest with stout transverse striolations. The pronotum at the base is edged with 

 a close greyish pile ; the pleurae, and especially the sternum, with rather long grey 

 hair ; the mesonotum clothed with short pile. Petiole curved, pilose beneath, nearly 

 as long as the following three abdominal segments united. Pygidial area acute at the 

 apex, shining, keeled laterally. Legs with the tibiae and tarsi densely pilose; the 

 femora bearing rather long white hair. Second cubital cellule converging at the top, 

 not triangular, at the top as wide as the space bounded by the recurrent nervures ; 

 the first two transverse cubital nervures straight, the third curved inwardly in the 

 middle; the first recurrent nervure received a little before the middle, the second 

 perceptibly before the transverse cubital nervure. 



Not difficult to distinguish from the other species here described by the projecting 

 clypeus, narrowed towards the apex. 



6. Himesa montezuma. 



Nigra, basi antennarum rufa ; petiolo quam abdomen breviore ; mesonoto et scutello striolatis ; segmento 



mediali argenteo-hirto ; alis brevibus, hyalinis. $ . 

 Long. 10| millim. 



Hob. Mexico, Atoyac in Vera Cruz (H. H. Smith). 



Allied to M. monticola; but with the clypeus less projecting (being merely convex, 

 not gaping), and not narrowed towards the apex, this part being semicircular; the 

 ocelli form more of a triangle, and are in pits, while a furrow runs down from the 

 anterior one ; the punctuation of the head not so strong ; the scutellum longitudinally 

 rugose; the metanotum closely rugose;, the mesopleurae almost impunctate; the 

 median segment more coarsely rugose, and its base not so sharply curved; the 

 abdomen longer, and the petiole not much longer than the following two segments 

 united; the wings shorter, not reaching beyond the fourth abdominal segment (in 

 M. monticola they reach to the apex of the abdomen) ; and the third cubital cellule 

 shorter, not being twice the length of the second. 



