1901.] HYMENOPTEEA FROM NEW BRITAIN. 233 



Xanthoceyptus, gen. nov. 



Areolet minute, square ; the second transverse cubital nervure 

 faint ; the transverse median nervure is placed distinctly behind 

 the transverse basal ; the stigma is linear. Apex of clypeus 

 depressed obliquely, the middle with a short tubercle. Clypeus 

 distinctly separated behind. Labrum large, its apex rounded. 

 Temples not much developed behind ; the occiput transverse, with 

 the edges rounded. Eyes large, parallel, reaching to the middle of 

 the clypeus. Mandibles short, stout, the upper tooth projecting. 

 Parapsidal furrows distinct to shortly beyond the middle of the 

 mesonotum. Scutellum convex, but not much raised. Base of 

 the median segment smooth, the rest of it closely, stoutly, trans- 

 versely striated ; there are no teeth ; the spiracles are oval. 

 Petiole rather broad, the basal third only narrowed ; the spira- 

 cles are placed almost in the middle, only a very little behind 

 it. Abdomen smooth and shining ; the last segment is largely 

 developed above and below ; ovipositor as long as the abdomen. 

 Hinder legs long ; the tarsi spinose ; the fore tibiae not much 

 longer than the basal joint of the tarsi, they are distinctly 

 narrowed at the base. 



There is no little vein on the discoidal or recurrent nervures ; 

 the last joint of the tarsi is long, with its claw long, curved, and 

 simple ; on the front legs the basal joint of the tarsus is longer 

 than all the others united ; the antenna are long and ringed with 

 white ; the occiput is not very sharply margined ; in the hind 

 wings the transverse median nervure issues from shortly below 

 the middle. The hinder tibiae are longer than the femora and 

 the tarsi. 



This genus may be referred to the Mesostenini, but it has hardly 

 the fades of that group or of the Gryptini. The fore tibiae remind 

 one of the XoricUni, e. g. Xylonomus ; but the totality of its 

 characters agrees with the Mesostenini. The minute areolet, 

 anterior tibiae contracted at the base, transversely striated median 

 segment, depressed apex of clypeus, and projecting labrum enable 

 it to be easily recognized. 



Xanthoortptus robustus, sp. nov. 



Luteus ; facie orhitisque oculorum jlavis ; antennis nigris, alho 

 anmilatis ; alis fulvo-hyalinis, nervis stigmateque nigris. 2 • 



Long. 18 ^nm. 



Antennae not quite so long as the body ; black, a short white 

 ring before the middle of the flagellum, the scape yellow. Head 

 smooth and shining, the vertex broadly black. Pro- and meso- 

 thorax smooth and shining, and tinged slightly with yellow. The 

 lower half of the metapleurae is closely and distinctlj'- punctured, 

 the upper stoutly obliquely striated. The apices of the four front 

 tarsi and almost the whole of the hinder are black. The apical 

 halves of the mandibles are black. The median segment behind the 

 keel is closely transversely striated, the striae extending to the 



