HYMENOPTERA FROM SARAWAK. 33 



The keel reaching" to the apex, of equal width through- 

 out ; the segment at its sides not depressed, nor strongly 

 transversely striated ; astriochus. 



(c) The keel not reaching to the apex ; the segment at 

 its sides depressed and strongly transversely striated ; 



ceressits. 



Iphiavlax acragas, sp. nov. 



Long : 11 mm ; terebra 6 mm. 



Hab. Borneo (Shelford). 



Antennae black, the scape luteous beneath. Head smooth 

 and shining ; the face sharpened, sparsely covered with long 

 fuscous hair ; the clypeus is bordered by oblique furrows later- 

 ally ; apex of mandibles black ; the palpi luteous. Thorax 

 smooth and shining sparsely covered with pale pubescence. 

 Legs coloured like the body ; the apical joint of the four hind- 

 er tarsi fuscous. Wings fuscous, with a slight violaceous tint; 

 the base behind the transverse basal nervure yellowish-hyaline ; 

 the first cubital and the discoidal cellule are lighter coloured in 

 the middle ; the stigma is black, with a luteous spot on its base. 

 The central part of the petiole is rugose and is stoutly longitu- 

 dinaly striated in the middle ; the second is closely rugously 

 punclured ; the lateral depressions are wide, deep and closely 

 longttudinally striated ; the oblique apical depressions are nar- 

 roweir, are deep and closely striated ; the suturiform articula- 

 tion is deep and rather strongly and regularly striated ; the 

 third segment is closely punctured ; the basal furrow is wide, 

 deep and closely striated in the centre ; it becomes narrowed 

 and curved at the sides ; its apical furrow is narrow. The api- 

 cal segments are smooth ; the furrows on the fifth segment are 

 narrow and striated. 



Iphiatdax ceressus, sp. nov. 



Long : 12 mm. 



Hab. Matang, 8000 feet (Shelford). 



Antennas entirely black. The face is more yellowish in tint 

 than the vertex ; its centre is irregularly striated ; the sides 

 punctured ; the clypeus is distinctly raised and clearly separated 

 from the face. Mandibular teeth black. Thorax smooth and 



