345 



b 9 . Posterior angle of the keels not produced into a 

 spiniform process. 

 a n . Tail quadrate; the upper surface of the keels 



horizontal subalbus. 



b 11 . Tail with widely rounded posterior border; 

 upper surface of the keels following the slope 

 of the dorsum. 



a 12 . Keels directed more forwards e. g. in the 

 17 th segment the anterior angle is square 

 and the posterior does not project beyond 

 the level of the posterior border of the ter- 



gum submissus. 



ö 12 . Keels less directed forwards, anterior angle 

 of the 17 th - obtuse and the posterior pro- 

 jecting beyond the line described above . . 



verrucosus. 



40. Platyrhachus humberti, sp. n. PL XIX, fig. 15. 

 Java: Buitenzorg. A single 9 example. 



Body narrowed anteriorly and posteriorly. 



Colour; head and segments nearly black, antennae, legs and keels 

 fulvous; foot-bearing sternal areas paler yellow. 



Head thickly granular. 



1 st tergite granular, with a row of tubercles along its hinder border, 

 with a small tubercular keel near the front of its lateral border. The 

 rest of the segments thickly and coarsely granular above, with a 

 row of smooth tubercules along the posterior border of each and two 

 other rows of tubercles in front of the posterior row; these rows of 

 tubercles become very distinct at the hinder end of the body. Keels 

 moderately large, rising just above the middle of the side, horizontal, 

 the anterior border straight, not serrate, and with a prominent basal 

 shoulder, the anterior angle sharp ; the lateral border for the most 

 part slightly emarginate irregularly tubercular or dentate , the posterior 

 angle acute and considerably produced in the hinder half of the body, 

 the posterior border lightly concave , not serrate ; the keels of segments 

 2 — 5 directed forwards, although hardly so in the 5 th ; of segments 

 6 to about 9 or 10 projecting at right angles to the long axis of the 

 body, and from about the 10 th to the end of the body projecting 



