24 IPHIAULAX AND CHAOLTA. 



Length 20 ; terebra 17 mm. 



Bab. Matang. 



Scape of antennae not much longer than the following 2 

 joints united, slightly gradually dilated towards the apex, which 

 is toothed slightly below; the pedicle short, not clearly separated, 

 thickly pilose, not half the length of 3rd. joint. Front and ver- 

 tex smooth and shining, almost bare, the former not furrowed ; 

 face irregularly shagreened, thickly covered with long fulvous 

 pubescence ; its centre bounded by longitudinal furrows ; apex 

 of mandibles black. Thorax shining, smooth ; the middle lobe 

 of mesonotum raised; median segment short, covered with pale 

 fulvous pubescence. Legs coloured like the thorax, sparsely 

 haired ; the fore tibiee not quite so long as the basal 3 joints of 

 the tarsi. Abdomen large, its middle clearly broader than the 

 thorax, and twice its length ; its first segment keeled down the 

 middle ; the dilated apical part with some stout longitudinal 

 striee and obliquely narrowed at the base ; the 2nd. segment is 

 closely, longitudinally striated throughout ; the 3rd. similarly 

 striated to the middle, the 4th. before the furrow ; the base of 

 the 3rd and 4th smooth and shining ; the rest of them and the 

 5th closely ru^osely punctured ; the apical segments less strong- 

 ly punctured ; all the transverse furrows are deep and strongly 

 striated ; the obliqued lateral furrows are short, indistinct. 

 Temples broad, rounded ; occiput roundly incised. 



This species has the large yellow wings, with black spot 

 at the base of stigma and general colouration of /. leptopterus ; 

 but it is much larger and more stoutly built ; otherwise it may 

 be separated from leptopterus and its allies by the striated, punc- 

 tured abdomen, by the curved 1st. transverse cubital nervure 

 and by the much shorter, compared with the 3rd., 2nd. abscissa 

 of radius. 



Iphiaulax leptopterus Cam. 



The $ of this species has been taken at Santubong, 2600 

 feet by Mr. Shelford. It agrees closely with the $ . 



Iphiaulax spilostigmus sp. nov. 



Luteous ; the wings and their nervures luteous, a square 

 black mark, not extending beyond the cubitus, at the base of 



Jour. Straits Branch 



