352 



6 th becoming very gradually directed more and more backwards with 

 anterior border very lightly convex, and posterior border straight; 

 the lateral margin more or less strongly excised, the anterior angle 

 either sharp or rounded, the posterior angle rounded, either one or two 

 smaller teeth between them. The dorsal surface almost smooth, only 

 very weakly granular, with a row of tubercles only at the pos- 

 terior end of the body. The pores close to the emarginated border. 

 Caudal process with parallel sides , rounded lobate posterior border. Lat- 

 eral surface smooth; sternal surfaces not spinous and only lightly sulcate. 

 Copulatory foot stout, the inferior terminal flagellum curving di- 

 rectly upwards and backwards, the superior inwards and backwards. 



Length 52 mm., width of 10th 9 ? f 2^ 7.5, of 1»* 5.7, length of 1^ 2.7. 



Two male specimens were obtained. One of these represented by 

 only the anterior half of the body ') is coloured as described above. The 

 other, a complete specimen, is testaceous throughout and had no doubt 

 moulted only a short time before its capture. 



47. Platyrhachus subspinosus, sp. n. PL XIX, fig. 19 — 19 a . 

 Sumatra: Padang. 



Colour reddish brown; keels, legs, sterna, caudal process and an- 

 tennae, except the two apical segments, flavous ; a fuscous spot on the 

 middle of the anterior half of the somites. 



Head and antennœ normal. 



First tergite convex from side to side, the anterior border lightly 

 convex at the sides and sloping gradually backwards and outwards 

 to the lateral angle , the posterior border sloping more abruptly for- 

 wards to the same angle , a shallow furrow before the anterior border 

 which is furnished with a row of close-set small tubercles. Second 

 tergite with its keel depressed below the angle of the first and the 

 keel of the second. The keels of the third and fourth directed forwards 

 and downwards, with their anterior angles rounded but acute and 

 their posterior angles sharper but obtuse, lateral border very lightly 

 lobulate. The keels from the fifth to the twelfth projecting nearly at right 

 angles, the rest becoming gradually more and more directed back- 

 wards, the anterior border with a small but distinct basal shoulder, 

 nearly straight but perhaps very lightly convex, the anterior angle a 



1) The colouring of the posterior half of the body in fig. 9, therefore, is guess-work. 



