106 HYMENOPTERA OF SARAWAK. 



ous ; they are covered with longish pale hair ; in the middle 

 of the face is a deep furrow of uniform width ; the face is 

 smooth, flat. Median segment thickly covered with long 

 fulvous hair. Basal abdominal furrows broad, deep, stoutly 

 crenulated ; the 1st is broad, deep ; the lateral borders smooth 

 there are deep, smooth furrows on the apices of the 3rd, 4th 

 and 5th segments ; the oblique furrows on the base of the 

 2nd are deep. The sides of the segments are densely covered 

 with fulvous pubescence. Wings very large, wide ; the trans- 

 verse median nervure is not quite interstitial. The hind tarsi 

 are black except at the extreme base. There is a distinct 

 transverse furrow at the clypeus. Palpi yellowish. 



This species comes nearest to I. xanthopsia Cam., from 

 Ceylon, both having black heads ; it is larger and stouter ; the 

 2 may be separated thus : 



A broad yellow line on the upper inner orbits, extending 

 from the ocelli to the antennae ; the furrow on the top of the 

 face not reaching to the middle Xanthopsis. 



Only a yellow mark on the inner upper orbits ; the furrow 

 on the face reaching to the clypeus ... ... Sadongensis. 



Iphiaulax curvinervis, sp. nov. 



Black, the antennal scape, head, thorax and 4 front legs 

 red ; the posterior coxae, trochanters and femora black, tinged 

 with brown ; palpi pale testaceous, covered with white pubes- 

 cence ; wings highly iridescent, hyaline, the base slightly, but 

 distinctly infuscated, the costa, stigma and nervures pale fus- 

 cous ; the transverse median nervure sharply, obliquely sloped 

 in a line with the transverse median ; the praediscoidal nervure 

 roundly curved towards the cubitus, the discoidal cellule being 

 therefore narrowed at the apex. The basal 5 abdominal seg- 

 ments are strongly, closely longitudinally striated ; the stri- 

 ation on the 1st segment is sparser and more irregular ; in the 

 centre of the apical part is a stout longitudinal keel, which 

 bifurcates at the base ; the segment is of equal width throughout 

 and is distinctly longer than the second. The area on the 2nd 

 segment is stoutly striated, becomes gradually narrowed and 

 extends to the apex of the segment. Suturiform articulation 



Jour. Straits Branch 



