PLA TYRRHACID^. 
3 
Transverse constriction not costulate ; poriferous ring distant from the 
margin by a space equal to its diameter ; lateral margins of carinae slightly 
and broadly sinuate, not excised; the posterior corner square, not produced 
into a spur-like process ; carinse broad, equal to half the body-cylinder ; dorsum 
densely and evenly granular, the tubercles obsolete : Genus Acanthodesmus 
Peters, type A. pilipes (Peters), Borneo. 
The types of Acanthodesmus pilipes are at Berlin, but both are 
females. The character of the copulatory legs has accordingly been 
inferred from A. andersonii Poc."^, which appears to be at least con- 
generic with pilipes. 
The preceding table by no means exhausts the Oriental genera of 
this group as represented more conspicuously in the various papers of 
Mr. Pocock. Some of these can, it would seem, be safely indicated 
from that author’s excellent descriptions and plates, and the following 
table may be looked upon as supplementary, being intended to point 
out the differential characters of some of the forms which present the 
more striking divergencies from the genera established above. 
Copulatory legs with three prongs ; sterna not spined ; lateral margin of 
Carina with 4-6 rounded tubercles ; posterior corner of carina not produced 
into a sharp spur ; anterior and posterior margins of carinse smooth : Genus 
Zodesmus, type Z. tuberosus (Poc.t), Ki Islands. 
Copulatory legs with two prongs, or the sterna spined. .... 
Lateral carinse deeply bidentate, the pore located at the base of the anterior 
tooth: Genus Dicrodesmus SilvestriJ, type D. bide?is (Poc.), Sumatra. 
Anterior segments, at least, not bilobed, the others not deeply so, with the 
lobes and sinus more or less denticulate. ....... 
Carinse projecting obliquely forward so that even on the seventeenth seg- 
ment the posterior corner does not project farther back than the posterior 
margin of the segment : Genus Prodesmus, type Pr. stcbmissus (Poc.), Sumatra. 
Segments in front of the seventeenth with the carinae curved or produced 
farther caudad than the middle of the segments. 
Sterna spined ; copulatory legs with three prongs not greatly unequal in 
length : Genus Cradodesmus, type Cr. subspinosus (Poc.) 
Sterna not spined ; copulatory legs with two prongs. ..... 
Carinse of middle segments deeply and broadly excised ; the pore located 
close to the edge ; first segment with carinae short, directed backward and up. 
ward; dorsal surface nearly smooth: Leucodesmus, type L. weberi (Poc.), 
Sumatra. 
Carinse not excised, the poriferous ring remote from the edge by about its 
own diameter ; first segment with carinse longer, not directed candad ; dorsal 
surface densely granular: Genus Harpodesmus type H. laticollis (Poc.), 
Sumatra. 
*Ann. Mus. Civ. Genova (2) XIV, p. 788, 1895. 
t Ann. & Mag. Nat. Hist. (6) XV, p. 131, PI. IX, figs. 3-3 b, 1893. The other 
species of this table are to be found in Weber’s Reise, pp. 345-357. 
f Ann. Mus. Civ. Genova (2) XVI, p. 190, 1896. This paper came to hand 
after I had sent the same genus to the printer under another name. Two other 
geneia are proposed in the same place: Cyrtorrhachis, type Platyrrhacus sub- 
albus Poc., and Acisternum, type Platyrrhacus mo7i.ticola Poc., the first from 
Java, the second from Sumatra. 
