346 



backwards; the posterior angles of the keels from the 11 th segment 

 backwards project beyond the edge of the tergite that bears them. 



Pore close to the lateral margin of the keel. 



The cylindrical part of the segments finely punctulate or coriaceous. 

 Lateral surface of the keel-bearing portion granular, with tracheal 

 tubercles above the base of the legs. The sternal areas of the segments 

 not spined and not hairy. 



Tail wide , parallel-sided and with lightly convex and obscurely lobate 

 posterior border. 



Anal sternite granular. 



Legs hairy. 



Length nearly 60 mm., width of l»t segm. 5, of 11th 9, f 19* 4.8. 



This species is very likely identical with the one that Humbert 

 and Saussure identified with doubt as Polydesrnus (Stenonia) fuscus, 

 C. Koch (cf. Verh. z.-b. Wien. XIX, p. 676, 1869). But Koch's 

 figure, which is probably fairly accurate, makes such a reference 

 with regard to the specimen before me quite inadmissible. For in the first 

 place P. fuscus of Koch (Die Myr. 1, p. 46, pi. XX, fig. 40) is much 

 less attenuate anteriorly and posteriorly, and secondly it has the anterior 

 borders and angles of the keels strongly convex. 



41. Platyrhachus flavistemus, n. sp. PI. XIX, fig. 16 — 166. 



Java : Tjibodas. Several specimens. 



Resembling P. humberti in many respects , but the legs and antennae 

 are paler; the tail has more yellow on it, and the lower surface 

 of the cylindrical part of the segments is the same colour as the area 

 between the legs. 



The granulation of the head and segments is finer and closer and 

 the tubercles are much less coarse. The keels are smaller ; the anterior 

 border is basally shouldered, lightly convex and denticulate, the an- 

 terior angle nearly square and sharp, the lateral border weakly 

 tuberculate and posteriorly emarginate, the posterior angle produced 

 and spiniform, especially at the end of the body, and the posterior 

 border very strongly concave and denticulate. Pores just above the 

 edge. The small size of the keel is due to the fact that the posterior 

 border rises in front of the posterior border of the tergum. 



Tail with widely convex posterior border. 



Legs much less thickly hairy than in humberti. 



