HYMEXOPTERA FROM BORNEO. 7 



longitudinally striated, smooth in the centre at the base and, to 

 a less extent, at the apex ; the lateral furrows deep, obscurely 

 crenulated ; the 2nd segment strongly striated, the striae 

 interlacing ; the basal area bordered laterally by a short, broad, 

 smooth triangular one. Suturiform articulation broad, irregular- 

 ly striated ; there is an almost smooth, triangular plate on the 

 sides of the 3rd segment, their apices bordered by a broad, 

 closely striated band. The abdomen is as long as the head 

 and thorax united. Malar space with a wide shallow depression. 

 The basal 2 joints of the fore tarsi together are longer than the 

 tibiae. 



This species comes very near to /. Ipngitarsis, Cam. ; if it 

 were not for the difference in the form of the plates on the 

 2nd abdominal segment, I might have considered them identi- 

 cal species ; the central plate in the present species is long and 

 narrow, becoming from the base gradually narrowed to a fine 

 point ; the lateral plates are much broader than long ; in 

 longitarsis the central plate has the basal half of equal width, 

 the apical narrowed to a point ; the lateral plates are longer 

 than wide. 



V Iphiaulax pallidiorbitalis, sp. nov. 



Black, the head, antenna! scape, pro-mesothorax, base of 

 metathorax, anterior legs and middle coxae, trochanters and 

 femora, red ; the outer orbits, malar space to shortly beyond 

 the inner eye orbits and the base of the mandibles, pale yellow ; 

 wings fuscous, the nervures and stigma black. The 3rd to 5th 

 segments of abdomen closely, regularly striated ; the 2nd with 

 the central area, extending to the apex of the segment, becom- 

 ing gradually narrowed towards the apexT; it is formed by 2 

 keels which unite shortly before the apex, towards which they 

 are continued as one ; in the centre is a keel extending from 

 the base to the apex ; at the base, on either side, is a short 

 curved keel ; the central area is bordered by transverse curved 

 striae, more or less broken ; outside these are 2 irregular longi- 

 tudinal keels which are united at the base ; the space between 

 these and the outer edge is smooth, except at the apex, which 

 is irregularly reticulated. The suturiform articulation is not 



B. A. Soc, No, 48, 1007, 



