350 



anterior angle of all convex, rectangularly convex anteriorly, obtusely 

 convex posteriorly; the posterior angle a right angle anteriorly, beco- 

 ming more and more acute posteriorly; the external and anterior 

 margins lightly convex, the former not dentate, but slender and 

 very feebly quadrilobate. The upper surface of the somites closely and 

 finely, but not sharply granular throughout, with a series of larger 

 granules along the hinder border, and with indistinct traces of two 

 anterior transverse series, these last series being more pronounced 

 posteriorly. The pores situated about I a mm. from the lateral border. 

 The caudal process with convex obsoletely lobate posterior border and 

 slightly converging sides. The lateral surface of the keel-bearing half 

 of the segments somewhat coarsely granular. The sternal surface not 

 spined, emarginate behind and in front, transversely impressed above; 

 anal sternite bi-tuberculate. The cylindrical portion of the somites 

 exceedingly closely punctulate throughout. 



Legs normal. 



cf. A little narrower, a little flatter, keels a little larger, with 

 margins more distinctly lobate. 



Copulatory foot with its distal segment consisting of a proximally 

 hairy, distally smooth and tapering piece, which terminates in two 

 slender, pointed, curved processes, whereof the external is more 

 curved than the internal. 



Length about 72 mm.; width (across keels) of 10 th somite 10.5 mm.; 

 of I s * 7.5, of 2" d 9; length of 1»* 3. 



45. Platyrhachus xanthopus , sp. n. PI. XIX, fig. 11 — 18 a . 

 Sumatra: Manindjau and Paningahan. 



Q. Robust, attenuated anteriorly. 



Colour chocolate brown to nearly black above; antennae, legs and 

 keels flavous; the caudal process almost entirely flavous. 



First tergite about as wide as the head , lightly convex above , scarcely 

 keeled, the lateral border merely being produced into an angle, beset with 

 larger and smaller, low, rounded granules , a series of larger granules 

 along the anterior border, the anterior and posterior borders straight 

 in the middle, convex at the sides and converging to the lateral 

 angle; transverse impression in front of the anterior border. The keels 

 of the 2 nd , 3 rd and 4 th produced obliquely forwards and depressed; 

 keels of the rest of the segments situated above the middle of the 



