814 THE ENTOMOLOGIST. 



smooth, shining and glabrous. Mandibles rufous, sparsely covered 

 with long pale hair ; the palpi rufo-testaceous. Front and vertex 

 opaque, the front finely and closely punctured ; the upper half with an 

 indistinct furrow down its middle ; the lower half keeled in the middle ; 

 the upper half of the keel distinctly furrowed in the centre. Thorax 

 opaque ; the pleurte and apex of the median segment covered with 

 silvery pubescence ; the base of prouotum on the top raised ; the 

 raised part dilated laterally. The base of the median segment longi- 

 tudinally striated ; the rest of the basal region closely transversely 

 striated ; the central depression wide, not much widened towards the 

 apex ; the apex of the segment has an oblique slope, and has a narrow, 

 deep furrow down the centre. Pleurte smooth, the mesopleurse covered 

 with silvery pubescence. Legs black ; the trochanters, the tibiae in 

 front, the anterior tarsi, the spines, and the claws rufous. Abdomen 

 rufous ; the petiole black, except at the apex ; it is as long as the 

 second and third segments united ; the apical half is distinctly wider 

 than the basal, which is furrowed down the middle ; on the apex of 

 the second segment is a small black mark ; on the third a larger cleft 

 mark. 



VESPID^. 



Zethus quadridentata, sp. nov. 



Deep black ; the mandibles broadly lined with pale yellow in the 



middle ; wings fuseous-violaceous, paler at the base ; the tegulae bright 



red ; apex of mandibles with two sharply pointed teeth in the middle, 



and a broader, blunter one on either side. ^ . Long. 15 mm. 



Hab. Borneo. 



Antennae black, distinctly thickened towards the apex ; the last 

 joint brownish below ; the hook long, curved, stout. Head clos.ely, 

 rugosely punctured ; thickly covered with pale fuscous pubescence, 

 which is longest on the front. Clypeus broader than long, sparsely 

 punctured and thickly covered with long fuscous hair ; its apex is 

 broadly rounded ; the teeth are only distmctly visible when looked at 

 from below. There is a narrow reddish line on the pronotum near 

 the tegulre, where it is less strongly punctured than elsewhere. Meso- 

 notum shining, not strongly punctured, the apical half less strongly 

 than the base ; the furrows extend from the base to the apex ; they are 

 deep and smooth. Scutellum punctured, but not deeply or closely ; 

 there is a short, deep longitudinal furrow on the apex behind ; the 

 post-scutellum is more strongly punctured than the scutellum; its 

 sides are bordered by a distinct raised keel. The central part of the 

 apical slope of the median segment is bordered laterally by a stout 

 keel ; between the two is a shorter broad keel ; the enclosed space is 

 coarsely transversely striated ; the outer side and the apex of the 

 metapleurae coarsely reticulated. The middle of the propleurae bears 

 some stout keels ; the apex is smooth, with a row of punctures on the 

 lower edge. The upper part of the mesopleurffi is more strongly 

 punctured than the lower, and there is a longitudinal punctured furrow 

 in the middle ; the apical two-thirds of the upper part of the meta- 

 pleurte are strongly obliquely striated. Legs black, thickly covered 

 with pale pubescence ; the knees and calcaria pale. Wings fuscous- 



