430 Mr. R. I. Pocock on neio 



pores are about three diameters from the edge ; posterior margin 

 of posterior keels finely serrulate. 



Sternal spines longish. Coxae 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 body normally attenuate, the second 

 segment mucli 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. 



Antennae short in both sexes, the length less than the 

 width of the second tergite. 



Tergites granular or coriaceous, with three rows of tubercles 

 distinct 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 witli two pairs of longish spines; the anterior pair 

 divided downwards and forwards, the posterior pair vertically 

 downwards. 



Cop ulatory feet of male short, terminating in two subequal 

 prongs. 



Type S. Catorii. 



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 tlie keels are only lightly sinuate^ not deeply tootlied 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, 



