32 TPHIAULAX AND CHAOLTA. 



f. Luteous, wings fuscous yellow at the base, the abdomen short, 

 broad, ovate. The group of matangensis. 



Iphiaulax Sibanensis, sp. nov. 



Length 9 mm. £ . 



Hab. Mount Siban. May. 



Very Similar in colouration to /. matangensis, having, like 

 it, the head, thorax and legs luteous and the back of the abdo- 

 men for the greater part black, mixed with rufous, the wings 

 yellow at the base, fuscous beyond the transverse median ner- 

 vure; but it is more slenderly built; the scape of the antennae 

 and pedicle arefulvous, not black, more slender ; the 2nd. abscissa 

 of cubitus is only equal in length to the 3rd. not longer than it; 

 it has no area on the base of the 2nd. abdominal segment, but 

 there are two irregular keels uniting together shortly beyond 

 the middle and having 2 or 3 irregular transverse ones; the 

 space on either side of this instead of being, as in matangensis, 

 widely, irregularly reticulated to the apex, is only reticulated 

 at the base, the rest being closely, longitudinally striated ; the 

 punctuation on all the segments is closer and run more into lon- 

 gitudinal striae ; the abdomen is narrowed compared with the 

 thorax and is more suffused with red, the red too, being lighter 

 in tint; the suturiform articulation is more widely and distinctly 

 dilated backwards at the apex. 



Iphiaulax cilles, sp. nov. 



Luteous, the abdomen darker coloured, the flagellurn of 

 antenna?, and the hind tibiae and tarsi black ; the wings almost 

 hyaline, iridescent, the stigma and nervures black ; the plate on 

 base of 2nd. segment smooth and shining, its length about 

 equal to its greatest width ; the apical half roundly narrowed ; 

 the keel extends to shortly beyond the middle ; 3rd. abscissa 

 about as long as the basal 2 united. £ - 



Length 7 ; terebra 3 mm. 



Hab. Kuching. April. 



Scape of antennae luteous, narrowed at the base, about 3 

 times longer than wide ; its apex produced below ; pedicle rufous : 

 the 3rd. joint distinctly longer than the 4th. Front and vertex 



Jour. Straits Branch 



