430 Mr. R. I. Pocock on new 
pores are about three diameters from the edge ; posterior margin 
of posterior keels finely serrulate. 
Sternal spines longish. Coxe of second leg produced into a 
long spiniform process. 
Measurements in millimetres.—Total length 96; width of 
second segment 13°5, of fifth 17, of twelfth 16:3. 
Loc. Borneo (44°106). 
This form may prove to be the female of P. ornatus, but 
the teeth on the margins of the keels are smaller and more 
numerous, the dorsal surface is far more coarsely granular 
&c., the anterior borders of the keels less convex &c. 
The development of the coxal processes on the second leg 
may be a generic character. 
STENONIODES, gen. nov. 
Anterior end of the dody normally attenuate, the second 
segment much narrower than the fifth. 
First tergite carinate, broad in front, the anterior border of 
the keel on a level with that of the rest of the tergite. 
Antenne short in both sexes, the length less than the 
width of the second tergite. 
Tergites granular or coriaceous, with three rows of tubercles 
distinet but not strong; keels large, horizontal; anterior and 
posterior margins entire, lateral border at most sinuate, base 
of the keel elevated into a rounded prominence nearly on a level 
with the summit of the back. Pores far removed from the 
side margin of the keel ; anterior and posterior angles of keels 
rounded, not in any sense spiniform: only in the segments 
posterior to the sixteenth do the posterior borders of the keels 
project distinctly backwards. 
Caudal process with convex posterior border and rounded 
angles. 
Sterna with two pairs of longish spines; the anterior pair 
divided downwards and forwards, the posterior pair vertically 
downwards. 
Copulatory feet of male short, terminating in two subequal 
rongs. 
Type S. Catorit. 
This genus resembles Phyodesmus in the form of its first 
tergite, which either has the anterior angles produced or is 
broadest along the anterior margin; but the lateral margins 
of the keels are only lightly sinuate, not deeply toothed as in 
Phyodesmus. In the position of the anterior sternal spines it 
approaches Phractodesmus, but the latter has the posterior 
sternal spines directed backwards, not vertically downwards, 
