358 Mr. R. I. I'ocock on Chilopoda and Diplopoda 



extend on to tlie keels ; keels with widely rounded, strongly 

 convex anterior angles, very finely denticulate lateral edges, 

 and concave posterior edge ; the posterior angle acutely pro- 

 duced, even as far forwards as the fifth projecting beyond the 

 posterior edge of the tergite. Caudal process narrow, trian- 

 gular, truncate, with two spiniform tubercles on each side near 

 the base. Anal sternite trifid, the two tubercles projecting on 

 each side beyond the posterior edge. 



The sternal areas rather high, conspicuously sulcate trans- 

 versely ; the distance between the posterior coxee equal to the 

 length of one of them. 



Legs as in P. dentiger. 



Length 29 millim. ; width across keels 5, width between 

 keels 2-7. 



Loc. Tsu-Shima [Hoist Coll.).] 



[Polydesmus dentiger^ sp. n. (PI. XI. figs. 7-7 ^.) 



Colour as in P. compactus, but without the reddish tinge. 



Antennce long and slender; first segment half the second, 

 second nearly half the third and about equal to the fourth, 

 which is a little shorter than the fifth, but about equal in 

 length to the sixth, but thinner. 



Body much thinner than in compactus, with the sculpturing 

 more strongly defined^ being visible on the first tergite, and 

 on the nineteenth passing into ridges which project as spini- 

 form processes beyond the edge of the plate. The keels 

 smaller, with the anterior angle in all but the anterior seg- 

 ments not projecting forwards, but widely and obtusely 

 rounded ; the lateral margin finely denticulate ; the posterior 

 angle acute, spiniform, and from the fifth segment projecting 

 beyond the edge of the tergite ; the posterior margin bearing 

 a strong triangular tooth, which is separated by a deep notch 

 from the angle of the keel. 



Anal tergite not so distinctly denticulate as in compactus^ 

 but the sternite distinctly bifid owing to the large size of the 

 lateral tubercles. 



Sternal areas almost as in compactus, but those at the hinder 

 end of the body are less compressed, so that the space between 

 the basal segments of the legs of the last pair is considerably 

 greater than the length of one of the said segments. 



Legs covered with fine white hairs ; tarsus much the longest 

 segment, longer than the femur by about one third of its 

 length ; femur correspondingly longer than trochanter, which 

 is quite three times the length of the coxa and almost as long 

 as the patella and tibia taken together, the latter not very 

 unequal. 



