NO. 1831. 



NEW TROPICAL MILLIPEDE -COOK. 



409 



Fig. 7.— Chonodes- 

 mus alatus. An- 

 tenna. 



Fig. 8.— Chonodesmus 

 alatus. Segments 1 

 and 2. Dorsal raw. 



than joints 1, 3, 4, and 7, which are subequal in length. Surfaces of 

 all the joints rather densely hirsute with rather short hairs. Outer 

 side of joints 5 and 6 with a large rounded prominence 

 bearing numerous sense-cones. (Fig. 7.) 



First segment subcrescentic, very short and broad, 

 only slightly exceeded by the second segment. An- 

 terior margin evenly rounded, lateral corners rather 

 sharp, but scarcely produced; posterior edge with a 

 distinct median emargination and 

 a much slighter and broader emar- 

 gination on each side of the 

 middle. Surface covered with nu- 

 merous small convex areas, about twenty along 

 the anterior margin, those of the posterior margin 

 somewhat larger and less numerous. (Fig. 8.) 

 Dorsal surface of the segments occupied by three transverse rows 

 of convex, piliferous areas, smaller and more regular than those of 

 the carinas. Margins of carinas divided by radiating impressed lines 

 into broad, slightly angled or rounded lobes, four on the lateral edge 

 and four or five on the posterior. (Fig. 9.) 



Repugnatorial pores not opening on the margins of the carinas, but 

 at the side of a small elevation near the base of the second lateral 

 area, somewhat in front of the transverse middle of the carina. 



Last segment with apex rather broadly rounded, 

 only slightly exceeding the broad, triangular pro- 

 jections of the carinse of the penultimate segment. 

 (Fig. 10.) 



It was on this specimen that Peters evidently relied 

 in drawing his description of Cryptodesmus alatus, 

 and he stated in particular that his measurements, 

 11 mm. by 2.7 mm., applied to the 

 largest of the specimens. All the 

 other characters that Peters gives 

 in the original description apply to 

 this individual. 



In the second species of CJionodesmus, 0. regu- 

 laris, the dorsum is more convex and the carina? 

 less horizontal, the piliferous dorsal areas are more 

 equal in size, more regularly placed on the dorsal surface, and pro- 

 vided with longer hairs. The body measured 8 mm. by 2.2 mm., but 

 may not have been mature, as only 19 segments were counted. 



Fig. 9.— Chonodes- 

 mus alatus. Seg- 

 ments 4 AND 5. 

 Dorsal view. 



Fig. 10.— Chonodes- 

 mus alatus. Seg- 

 ments 18-20. Dor- 

 sal A'lEW. 



