355 



cf. Narrower and flatter than the 9- Copulatory foot terminating 

 in two slender pointed curved processes, the lower of which curves 

 directly upwards with the apex turning inwards, while the upper 

 curves almost directly inwards and backwards. 



Ç. Length about 60 mm.; width of 10 th segment 9; of 2 nd 7.5, of 

 1st 5.7 , length of 1 st 3. 



50. Platyrhachus submissus sp. n. PI. XXI, fig. 1 — I e . 

 Sumatra: Manindjau and Muka-Muka. 



cf. Colour upper surface of the tergites a deep brown throughout; 

 legs and antennae paler, the cylindrical portion of the somites yellow- 

 ish white throughout, contrasting strongly with the brown of the 

 keel-bearing portion. 



Head granular above, with frontal furrow. 



Antennœ short, reaching only to the posterior margin of the first 

 tergite, their length less than the width of the first tergite. 



First tergite strongly convex, granular throughout, with coarser 

 granules along the border, the anterior and posterior borders straight 

 in the middle, converging laterally towards the lateral angle which 

 represents the keel. The 2 nd , 3 rd and ¥ h segments strongly convex 

 above, the keels directed obliquely downwards and forwards; the 

 keels of the rest situated about in the middle of the side, depressed, 

 following the slope of the dorsal surface, all the keels projecting at right 

 angles to the long axis of the body, or if anything directed a little 

 forwards, the anterior border convex, the posterior correspondingly 

 concave, the lateral margin nearly straight and furnished with a few 

 tubercles; the anterior angle squared and sharp, the posterior acute 

 and sharp, produced, but only quite at the end of the body projecting 

 beyond the hinder border of the somite. The upper surface granular 

 throughout and furnished with three rows of tubercles, whereof one 

 runs along the posterior border. The pores close to the margin. The 

 lateral surface granular. The sternal surface not spined, and lightly 

 sulcate transversely. The caudal process with convex , lobulate posterior 

 border. 



Copulatory feet narrowed and incurved distally, the external flagel- 

 lum curled upwards and backwards, the internal flagellum curled 

 inwards and upwards. 



