HYMENOPTERA OF SARAWAK. 105 



angular, longer than its width at the base ; its apical keel 

 short ; the lateral basal areae are clearly defined, smooth, 

 triangular ; except on the areae and the apex the segment is 

 irregularly, closely striated ; the 3rd segment is irregularly 

 punctured on either side of the middle, the smooth 

 central part being triangular. Suturiform articulation deep, 

 closely crenulated; there is a narrow obscurely crenulated 

 furrow on the apex of the 3rd segment and an obscure indica- 

 tion of one on the apex of the 4th. Hypopygium black in the 

 centre, the sides pale. 



A species closely allied to I. thepsis Cam., with which it 

 agrees in colouration, except that the latter has not the head 

 and base of thorax marked with black ; otherwise thepsis is 

 easily known by the very much smaller plate on the base of 

 the 2nd abdominal segment — I. portius Cam. is similarly 

 coloured, but is much larger ; the area on 2nd segment is 

 stoutly bordered by oblique striae, the 3rd is closely striated 

 throughout and the yellow-hyaline extends to the recurrent 

 nervure. 



Iphiaulax sadongensis, sp. nov. 



Luteous, the antennae, front, vertex, occiput and outer 

 orbits, black, the wings to the lower half of the transverse 

 basal nervure and to shortly beyond the transverse median, 

 yellowish-hyaline, the costa and nervures reddish-luteous 

 in the yellow basal part ; the rest of the wings dark 

 fuscous ; the basal half of the stigma reddish luteous ; the 

 usual cloud in the 1st cubital cellule yellowish-hyaline. 

 There is a small, pyriform mark on the sides of the front at 

 the top of, and touching the eyes ; the centre of the 1st 

 abdominal segment and the 2nd and 3rd are strongly, closely 

 longitudinally striated ; the 1st with a stout keel down the 

 middle ; there is no defined area on the base of the 2nd seg- 

 ment, beyond the centre being more strongly striated. 2 



Length 13 mm. ; terebra 5 mm. 



Sadong. August. 



Abdomen broad, ovate, as long as the thorax and wider 

 than it. The face and oral region are pale yellowish testace- 



E A, Soc, Nc.i46, 190?. 



