Genera and Species of Millipedes. 443 
the posterior border produced some distance behind the 
posterior lateral tubercles. 
Measurements in millimetres.—'Votal length 55; width of 
second segment 7°5, of fifth 9. 
Loc. Victoria Mountain, New Guinea. 
In the form of its keels, as in other features, this species 
would seem to resemble Platyrrhachis pergranulosus of 
Silvestri (Ann. Mus. Genova, xxxiv. p. 639, 1895), from 
Maroka, in New Guinea; but the statement ‘ segmentum 
primum angulis anticis rectis, valde productis” does not 
apply to the first tergite of vdctorte, in which the lateral 
atigles have the form of a conical triangular tooth. 
The structure of the copulatory feet of Lord, Silvestri (loc. 
cit.), and pergranulosus does not seem to be the same as that 
presented by H. margaritatus; HL. Loriw further differs in 
colour and pergranulosus in the form of its keels from 
margaritatus. 
DIODONTODESMUS, gen. nov. 
Allied to Eutrachyrhachis, but with the keels larger and 
higher, body less convex, the anterior cylindrical portion of 
the segments smooth ; the area between the tubercles on the 
dorsum also smooth, and the suture not sculptured. 
Copulatory foot of male ending in two simple branches 
directed inwards. 
Type D. Woodfordi, sp. n. 
Diodontodesmus Woodfordi, sp. n. (Fig. 17.) 
9.—Colour (of dry and probably faded specimen) a 
tolerably uniform greyish black ; the cylindrical half of the 
segments white above, with a median dark stripe. 
Length of antenne less than width of first tergite. 
First tergite granular, with only the posterior row of 
tubercles distinct, its anterior border evenly convex from the 
rounded angular lateral prominence; second and_ third 
segments also granular throughout, with large depressed 
keels. The rest of the segments very sparsely granular 
above, almost entirely smooth on the posterior end of the 
body, much more coarsely granular on the keels, the anterior 
lines of tubercles weak, the posterior conspicuous. Keels 
with anterior and posterior borders denticulate, anterior angle 
rounded, posterior angle acute but not spiniform ; lateral 
margin lightly sinuate; keels of segments 2 to 13 directed 
obliquely forwards, keels not shouldered basally. 
30* 
