347 



cf Slenderer than Q, with the keels larger and a little higher. 



Gopulatory foot stout and hairy at the base, slender and naked dis- 

 tally where it terminates in two thin curved pointed processes, a 

 lower or posterior which curves downwards and outwards and an 

 upper or anterior which curves inwards and backwards. 



9 Length 58 mm., width of 1 st segment 5, of 11 th 9, of 19 th 5 

 cf » 55 „ „ „ „ „ 5.8, „ „ 7.5, „ „ 4.1 



Differs from humberti in the characters pointed out. Moreover if 

 C. Koch's figure of P. fuscus is correct, the latter differs from P. 

 flavisternus , in the shape of the tail and of the keels. In many points 

 of structure it seems to be allied to P. javanus , Saussuee (Linn. Ent. 

 XIII, p. 324): but the latter is said to be of a café-au-lait brown 

 colour, no mention being made of flavous keels; and in javanus also 

 the keels are said to arise in the middle of the side, whereas they 

 are distinctly above the middle in P. flavisternus. 



42. Platyrhachus subalbus, sp. n. PI. XIX, fig. 17 — 17&. 

 Java: Buitenzorg. Several examples. 



Colour as in flavisternus, but with the legs and antenna? a little 

 darker and like those of P. humberti. 



Granulation coarser than in flavisternus but not so coarse as in 

 humberti. 



Keels different from both; anterior border straight or very lightly 

 convex with a strong basal shoulder, scarcely denticulate ; the anterior 

 angle not sharp but rounded, the lateral border lightly lobate; the 

 posterior angle squared or acute but not produced and spiniform as 

 in the preceding two species; the posterior border nearly straight, 

 minutely denticulate. Pore just above the margin. 



Tail squared as in P. humberti , but relatively a little shorter. 



Legs hairy as in humberti. 



cf Smaller and thinner than the Q, but with relatively larger keels. 



Copulatory foot on the same plan as in P. flavistemis, but with 

 the lower process directed forwards and curving lightly upwards and 

 outwards, the upper one is curved backwards. 



Q Length 55 mm., width of 1 st segment 4.5, of 11^ 8, of 19t h 4.5 



c? » 48 „ „ „ „ „ 5, „ „ 6.8, „ „ 4 



Of the three Javan species here described P. subalbus seems to 



