434 Mr. R. I. Pocock on new 
Dorsum of posterior segments coriaceous, not granular, 
upperside of keels granular; margins of keels lobulate, 
straight; pore about a diameter and a half from the edge. 
Caudal process with its margin less convex than in Avdersonit. 
Copulatory organ with the prongs differently curved, the 
inner being bent more abruptly backwards and the outer less 
abruptly backwards. 
Measurements in millimetres.—Total length 64; width of 
second segment 8:2, of fifth 10. 
Loc. Pinang (H. N. Ridley). 
Acanthodesmus perakensis, sp. nu. (Fig. 7, pe 431.) 
As large as Andersonii, but differently coloured and more 
coarsely sculptured. 
Legs and antenne flavous as in that species; dorsum of 
keel-bearing portion of segments brown, lateral portions on 
base of keel noticeably darker, the rest of the keel flavous ; 
cylindrical area of segments dorsally pale brownish yellow 
with a median black band. 
Dorsal surface of all the segments, even at the end of the 
body, very distinctly granular, more so than in Andersoniv. 
Copulatory organ with practically the same curvature of 
prongs as in Andersonii. 
Measurements in millimetres.— 3 (small). Total length 68 ; 
width of fifth segment 10. 9. Total length 82; width of fifth 
segment 13. 
Loc. Perak. Specimens presented by J. H. Leech, Esq. 
Acanthodesmus Peters, sp. n. (Fig. 8.) 
g .—Colour faded, apparently as in perakensis, but the 
keels without indication of a black basal patch, as much 
yellow on them as in Andersoniz, the cylindrical part with 
traces of a median dark line. But apart from its colouring, 
which is of doubtful value, seeing that the specimen is faded, 
the species certainly differs from both Andersoniz and perak- 
ensis in the form of the copulatory foot, the inner prong of 
which is not bent backwards but inwards, then slightly 
forwards at the tip. 
Measurements in millimetres.—Total length 72; width of 
fifth segment 10. 
Loc. Malay Peninsula (Ind. JMus.). 
Acanthodesmus lineatus, sp.n. (Fig. 9.) 
$.—Oolour black, the edges of the keels very narrowly 
bordered with pale yellow and a narrow (1 mm. wide) 
longitudinal dorsal band extending from the upper surface of 
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