266 PROCEEDINGS OF THE ACADEMY OF [1896. 



Pelodesmus fossor. 



Differing from Udodesvius in the more robust body, the squarer and 

 broader dorsum, and the more prominent and stronger dorsal pro- 

 cesses arranged in two rows ; each process distinctly bifid, instead of 

 indistinctly trifid, directed obliquely cephalad. The first segment 

 lacks the inner pair of large lobes, which are apparently replaced by 

 a pair of anteriorly directed large processes similar to those of the 

 other segments ; last segment much as in Udodesmus. Surface 

 thickly incrusted with earth; length 7.5 mm., width 1,5 mm.; 

 locality, Freetown, Sierra Leone, under stones in a moist, shaded 

 place. 



Stegodesmus leonis. 



A recently discovered genus evidently related to Udodesmus, but 

 distinct by remarkable characters. First segment nearly as broad 

 as any, much broader than the second, about twice as broad as long, 

 strongly decurved, the anterior margin transverse, entire, decurved, 

 completely concealing the head ; antennae distinctly clavate, genic- 

 ulate; dorsum strongly arched, the carin re depressed ; surfiice finely 

 roughened, ornamented with four longitudinal ridges, of which the 

 part on each segment is apparently composed of three coalesced 

 tubercles or granules ; a deep median longitudinal sulcus, giving a 

 resemblance to the Platydesmidce ; last segment completely concealed 

 by the greatly produced median pair of ridges of the nineteenth, 

 which is canaliculate and deeply bifid when viewed from above; 

 pores on very distinct special papillse of segments 5, 7, 9, 10, 12, 13, 

 15, 16 ; color pale pinkish, concealed by the adhering soil ; length 

 5.5, width 1.1 mm.; a single female specimen was found under a 

 stone in a moist place in Freetown, Sierra Leone, January, 1896. 



Pronodesmus melas. 



First segment completely concealing the head, the anterior margin 

 faintly lobed or scalloped, the upper surface with a few scattered 

 conic tubercles; segments with two conspicuous longitudinal ridges, 

 the prominences of each segment composed of two tubercles some- 

 what coalesced at base ; below these ridges there is on each side a 

 row of three small tubercles on each segment ; pores located near 

 the posterior corner of the carina, opening dorsad on incons2:>icuous 

 rounded prominences of segments 5, 7, 9, 10, 12, 13, 15-18 ; eigh- 

 teenth segment with processes coalesced in the median line, the 

 resulting protuberance projecting as far caudad as the apex of the 



