30 IPHIAULAX AND CHAOLTA. 



face pale yellow ; malar space hollowed ; tips of mandibles black. 

 Temples wide ; occiput roundly incised. Thorax smooth ; par- 

 apsidal forrows indistinct; furrow at base of scutellum smooth ; 

 the oblique furrow on mesopleurae distinctly defined. The rais- 

 ed centre of 1st. abdominal segment is lon^r, narrowed at the 

 base; becoming gradually wider to the apex; the basal 

 depression is triangular, deep, its lateral keels stout ; the central 

 part of the 1st. and the 2nd. and 3rd. segments are closely, strong- 

 ly striated ; there is no area on the base of the 2nd. segment ; its 

 sides at the base, as also those of the 3rd., are smooth ; the furrows 

 on the 3rd. and 4th are crenulated ; 3rd. abscissa of radius about 

 as long as the basal two united; th? 3rd. abscissa of cubitus is 

 distinctly shorter than the 2nd. 



e. Yellow, the abdomen and hind legs black, wings fuscous, 

 broadly hyaline at the base. 



Iphiaulax thespis, sp. nov. 



Head, thorax and 4 anterior legs luteous ; the antennse » 

 abdomen and hind legs black; the wings to the base of cubitus 

 and nervure yellowish-hyaline, the rest fuscous, the base at the 

 base of the anal nervure hyaline ; the hind wings yellowish 

 hyaline to shortly beyond the middle ; stigma black ; the 2nd. 

 abscissa of radius slightly longer than the 3rd. $ . 



Length 9 ; terebra 8 mm. 



Hab. Matang. August. 



Scape of antennae about 4 times longer than wide, of equal 

 thickness throughout, covered with short pale pubescence. 

 Front and vertex smooth ; the former deeply furrowed ; face 

 thickly covered with long white hair. Temples as long as the 

 antennal scape, roundly narrowed ; occiput transverse. Thorax 

 shining, the middle lobe of mesonotum raised ; the oblique fur- 

 row on mesopleurse reaching near to the apex. Abdomen as 

 long as the head and thorax united and wider than the latter ; 

 1st. segment irregularly striated and with a distinct keel down 

 the centre; the sides and apex yellowish, smooth; 2nd. segment 

 closely, longitudinally striated ; its basal area small, smooth, 

 broader than long, obliquely narrowed to the apex ; on either 

 side of it is a smooth plate, longish, gradually narrowed to the 



Jour. Straits Branch 



