Systematics of certain Chilognathous Diplopods. 529 
its infero-lateral portion tubercular and extending below 
that of the first, thickened and produced externally and 
inferiorly, its posterior angle obtusely rounded, its anterior 
angle acute and underlying the corresponding angle of the 
first ; in addition to the low and irregular tubercles upon 
the inferior crest the segment is furnished with fifteen large 
tubercles as well as some smaller ones. Third and fourth 
segments narrower than the second or fifth, the latter slightly 
wider than the second. The anterior and median areas of 
the segments not differentiated, forming a continuous area 
covered with a reticulation of very fine ridges, which on the 
anterior part of the inferior portion of the segments run into 
definite transverse ridges in front and obliquely transverse 
ridges behind. The posterior elevated portion of the segments 
coarsely ridged inferiorly below the tubercles; the elevated 
portion furnished with an anterior row of smaller tubercles 
in addition to the larger and smaller ones forming the 
posterior row (fig. IIT. 1 a). 
Fig. IIT. 
Sie 
1. Eucentrobolus tamulus, gen. etsp.n., 6. Head and first two segments, 
la. Ditto. Segment of mid-region of hody. 
10. Ditto. Last two segments. 
lc. Ditto. Gonopods from anterior side. m, median, a, anterior, and 
p, posterior sclerites of coleopod; ph, phallopods withdrawn 
and protruded. 
1d. Ditto. Left leg of third pair. 
Anal segment : tergite closely granular, its median dorsal 
area longitudinally and bluntly carinate and tubercular ; 
caudal process long, attenuate, projecting horizontally, then 
sharply curled down at the apex, tubercular. Valves 
