348 



approuch nearest to P. fuscus of Koch, but the latter is far too 

 thick at the anterior and posterior ends of the body ; the anterior 

 borders and angles of the keels are too rounded, the former being not 

 shouldered at the base; the posterior angle is spiniform and the 

 pore is too far from the lateral margin. 



In addition to the known Javan species which have already been 

 noticed, the two following seem to be quite distinct from the three 

 new ones here described. 



P. pfeifferœ , Humbert and Saussure (op. cit. p. 680) , from Batavia , 

 has the body smooth and nearly parallel sided; it is moreover very 

 large (101 mm.), and the pores are placed near the middle of the dorsal 

 surface of the keels. P. princeps, Gervais (Ins. Apt. IV, p. 100) is also 

 a very large species (110 mm.). It is pale brown and has two yellow 

 spots upon the dorsal surface of the cylindrical part of the segments. 



43. Platyrhachus mirandus, sp. n. PL XX, fig. 1 — lb. 

 Sumatra: Manindjau, Muka-Muka, Ajer Mantjur. 



Colour (in alcohol); upper surface a deep bluish or greenish or even 

 pinkish grey, the very margins of the keels flavous ; two nearly white, 

 elongate, anteriorly abbreviated spots on the upper surface of the 

 anterior cylindrical half of each somite ; the lateral portions of the 

 somites deep purple or chocolate brown ; the lower surface and a 

 narrow space above the joints for the legs ochraceous or ferruginous; 

 legs and antennae brunneous or ferruginous, basal two segments of the 

 legs ochraceous; head of about the same colour as the tergites but darker. 



Q. Head with a conspicuous frontal sulcus, laterally subgranular. 

 First tergite wider than head, about twice as wide as long, lightly 

 coriaceous, its anterior lateral angles produced into a distinct, de- 

 pressed, rounded keel, its anterior border convex, its posterior border 

 very nearly straight. The remaining tergites lightly convex , not granular 

 but coriaceous with very faint indications of three transverse series 

 of granules ; the keels not quite horizontal , the external border oblique 

 i. e. higher behind than in front, the keels at the posterior end of the 

 body nearly horizontal , the hinder borders of the last six keels directed 

 backwards and those of the first four directed forwards, those of the 

 intermediate segments gradually changing their direction ; the anterior 

 border of all the keels from the 10 th to the 19 th lightly convex and 

 directed backwards, not shouldered the lateral borders from the 4 th 



