436 Mr. R. I. Pocock on new 
Copulatory organ long, curved, ending in two short 
subequal prongs. 
Differing from <Acanthodesmus and allied genera by the 
large size of the keels of the second and third segments, 
especially of the second. 
Eurydirorhachis dulitensis, sp.n. (Fig. 10, p. 441.) 
Colour black, the lateral margin and anterior and posterior 
angles of the keels ochre-yellow, but only at the hinder end 
of the body does the yellow extend inwards and involve the 
pore ; first tergite and caudal process scarcely noticeably 
yellow; antennz blackish; legs fulvo-fuscous, with paler 
basal segments. 
Dorsal surface of segments coarsely granular on anterior 
half of body, less coarsely posteriorly, but the rows of tubercles 
distinct on all of them ; margins of the keels indistinctly four 
or five lobate; the posterior border basally indistinctly 
angulate. Pores situated about two or three diameters from 
the lateral border, but farther away from it in the posterior 
than in the anterior half of the body. 
Copulatory feet as in fig. 10; distal segment thick and hairy 
at base, then suddenly narrowed and running out into a long 
strongly arched smooth ramus, curved upwards and backwards 
and ending in two short subequal prongs. 
Measurements in millimetres.— ?. Total length 83; width 
of fifth segment 15, of second 13°6. 
Loc. Mount Dulit, N. Borneo (C. Hose). 
Eurydirorhachis baramensis, sp. n. 
9 .—Resembling the preceding, but with the keels more 
flavous, the yellow even in the anterior half of the body 
extending as far as the pore, while the first tergite has its 
side margins very distinctly flavous and nearly the whole of 
the caudal process is pale; the legs and antenne also are 
paler. Keels a little larger. 
Measurements in millimetres.—Total length 82; width of 
fifth segment 15°5, of second 13°5. 
Loc. Baram, N. Borneo (C. Hose). 
Eurydirorhachis discrepans, sp.n. (Fig. 11.) 
g.—Colour (dry) a uniform chocolate-brown, the yellow 
on the keels (if any) being not distinctly indicated except on 
the first segment, where it is very visible. Closely related 
to the preceding species, but with the side margins of the 
keels much more distinctly lobulate, the lobules on the poste- 
