1895. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 107 



united into a longitudinal dentate ridge. On the third segment the 

 tubercles of posterior row next the median ones also very large, but 

 showing no tendency to coalesce with the others. 



Fourth segment with tubercles abruptly smaller and showing no 

 tendency to coalesce; tubercles, however, larger than on succeeding 

 segments. 



Posterior row of tubercles stronger than the others, but all very 

 distinct. 



Pores, especially on anterior segments, facing almost directly laterad. 



Length of type specimen, 43 mm. ; width, 6.5 mm. 



The habit of this species is quite distinct from all the others by rea- 

 son of the square carinne and the stronger marginal teeth. Gerstiicker's 

 figure gives a rather correct idea of the general effect. 



ORODESMUS PECTINATUS (Karsch). 

 (PI. V, fig. 2; PI. VI, fig. 11.) 



Polydesmus (Oxydesmiis) pectinaius, Karsch, Troscbel's Archiv, 1881, pp. 36, 46. 



Vertex strongly rugose. 



Segments nearly iiat, above with two rather deep transverse furrows ; 

 obsolete on segments 1-4, each segment with three rows of granule- 

 bearing areas, the posterior row armed with seven to nine acute 

 tubercles. 



Fourth segment sparsely covered with irregularly arranged granules; 

 in the middle of the posterior margin armed with a somewhat flattened, 

 six-toothed, comb-like process, yellow in color and equal in length to 

 the fifth segment; the two outer teeth of process shorter. 



Lateral carinje wing-like; those of segments 1 and 2 with margin 

 oblique, three-toothed ; segment 4 four- toothed; subsequent segments 

 six-toothed. 



Color of head and segments dorsally black ; carinas yellow (in alco- 

 hol); antenna) and feet pale. 



Length, 43 mm. 



Locality. — Wito, East Africa. One female, collected by Dr. Fischer. 

 Type in the Berlin Museum. 



This species is strikingly distinct from all others yet known in the 

 possession of the remarkable process of the third segment. So pecul- 

 iar a structure did this appear that I suspected that it was abnormal. 

 An examination of the type and only extant specimen at Berlin shows 

 that there is no ground for such a supposition. The following notes 

 were made on the type specimen : 



First segment shaped like Plate Y, tig. 12 (0. bicolor), the tubercles 

 similarly arranged, but with four in the middle row and eight in the 

 last; none especially enlarged or coalesced. Anterior raised margin 

 very distinct. 



Second segment also without special modification, except that the 

 median tubercles of the last two rows are slightly larger than the 

 others. 



