349 



to the 18 th oblique i. e. converging posteriorly, those in the poste- 

 rior half of the body cut out usually into five or four teeth, the 

 anterior and posterior of which are formed by the anterior and 

 posterior angles, sometimes, however, there is but one tooth 

 between the angles; lateral portions of somites coriaceous but not 

 granular; sternal area furnished with four tubercles, one at the 

 base of each leg. Anal somite; tergite produced posteriorly into a 

 wide parallel-sided plate , with rounded posterior angles , and lightly 

 convex and obscurely lobate hinder border; the lateral portion bea- 

 ring posteriorly two tubercles whereof the superior is much the 

 larger; sternite with two tubercles on its posterior border; anal valves 

 coriaceous with margins compressed, each bearing a single tubercle. 



Legs closely hairy. 



tf . Smaller (i. e. shorter and relatively narrower) and flatter than 

 the 9, with the keels markedly less depressed. 



Copulatory feet somewhat short ; the second segment hairy and stout 

 at the base and giving off above (or anteriorly and internally) a short 

 spiniform process, produced distally into a stoutish piece which ends 

 in two (an upper and a lower) outwardly directed, curved slender, 

 subequal processes. 



9 (large sp.). Length 134 mm., width of 1 st segm. 11, of 10th 21.5, of 19th 9.5. 

 <? „ 113 „ „ „10th „ 18.5. 



44. Platyrhachus laticollis, sp. n. PI. XX, fig. 8 — 8&. 

 Sumatra: Manindjau, Muka-Muka, Ajer Mantjur. 



9- Colour piceous or almost black; the keels flavous, the caudal 

 plate with its hinder border broadly or narrowly flavous; legs and 

 antennae varying from flavous to fusco-ochraceous. 



Head and antennae normal. 



The first tergite wider than the head, about twice as wide as long, 

 flat with distinct and elevated keels, a transverse impression before 

 the anterior border, finely and closely granular throughout, a series 

 of larger granules along the anterior and posterior borders. Second 

 and third and fourth segments with their keels nearly horizontal and 

 directed obliquely forwards. Keels of the rest also horizontal , rising in 

 the upper half of the side, those of the fifth, sixth, seventh and 

 eighth with their posterior borders in a straight line , those of the 

 rest becoming progressively more and more directed backwards; the 



2:} 



