262 PROCEEDINGS OF THE ACADEMY OF [1896. 



has neither process nor pores. The first and eighteenth segments 

 have the processes united for more than half their length. 



Udodesmus telluster. 



Length 8.5 mm., width 1.25 mm.; penultimate segment project- 

 ing beyond the last, but not exceeded by the processes of the eigh- 

 teenth, which are not coalesced ; processes trituberculate at apex ; 

 first segment with two large processes, and four large lobes in front, 

 the median notch large, deep, rounded. 



Hercodesmus aureus. 



Length 6.75 mm., width .75 mm. ; last segment exceeded by the 

 penultimate ; processes replaced by longitudinal ridges ; carinas very 

 narrow ; first segment with margin very faintly lobed. 



Stiodesmus stratus. 



Length 10 mm,, width 1.4 mm. ; last segment not concealed ; first 

 segment not lobed, but, like the rest of the dorsal surface, beset with 

 rounded gx-anules or tubercles. The affinities of this form are some- 

 what obscure. The general appearance and sculpture suggest 

 Comodesmus, but the form of the first and last segments and the 

 structure and location of the pores are very different. It may prove 

 to be one of the Cryptodesmidce, in the sense of being more nearly 

 related to Cryptodesmus olfersii than to the other species which have 

 been described under that much over-worked generic name. 



RELATED FORMS NOT FOUND IN LIBERIA. 

 Xyodesmus planus. 



Related to Thelydesmus, but distinctly more depressed, especially 

 the male. Last segment broad at apex and with a large, conic, 

 marginal tubercle on each side hearly equalling the apex ; dorsum 

 densely beset with conic tubercles; carinse broad, dentate, with 

 numerous pointed-conic tubercles; antennse scarcely clavate ; head 

 not concealed; first segment narrower than the second; sterna 

 granulate, especially in the female ; color nearly black ; length 21 

 mm., width of male 3.75 mm. ; of female 4 mm. ; locality, Bismarck- 

 burg, Togo Colony, Dr. K. Biittner ; Berlin Museum. 



Helodesmus porosus. 



Related to Comodesmus rather than to the other families, but with 

 remarkable diff'erences. First segment widest, concealing the head ; 

 body tapering caudad, subcylindric, not coiled into a spiral ; dorsum 

 very convex, rough with low granules, and incrusted with earth; 



