1895. PROCEEDINGS OF THE NATIONAL MUSEUM. 85 



smaller tubercles; one pair apical and one subapical; these last rising 

 from punctations. 



Anal valves with compressed, elevated margins and two setigerous 

 tubercles, the upper placed on the outer slope of the raised margin, 

 the lower somewhat removed from it. 



Preaual scale semielliptic-triaugular, tricuspidate, the three projec- 

 tions close together, the middle flat, the others conic, blunt, with pili- 

 ferous i)unctations at apex. 



Sterna with a sharp, transverse, mediauly interrupted ridge between 

 the bases of each pair of legs; between the ridges a transverse furrow. 



Sternum of sixth segment of male with a three-cornered ])rocess pro- 

 jecting veutrad between the anterior pair of legs. Sternnm of the fif- 

 teenth segment of male with a broadly ensiform process projecting 

 cephalad from between the anterior pair of legs into a socket in the 

 posterior part of the fourteenth. 



Eighteenth segment with the pedigerous lamimTe very narrow, especi- 

 ally the posterior, so that the legs project obliquely candad over the 

 preaual scale. 



Legs of males long and crassate, the dorsal face of the second joint 

 strongly inflated; all the joints more or less tuberculate on the ventral 

 face and beset with bristles on the apical joints. 



First six pairs of male legs with a fleshy sole at apex of the last joint, 

 and the claw shortened. 



First pair of legs of male six-jointed like the others; the coxjc long, 

 approximate. 



Second pair of male legs with thecoxne produced veutrad into a large 

 process, in the depression of the flattened ventro-posterior face of which 

 is the seminal opening. 



Male genitalia with basal joint very small, flattened ; distal joint very 

 large, laterally compressed, tricarinate; ungual portion very long, 

 complicate, thin, and compressed at base to forui a flexible pseudo- 

 articulation, above which it is inflated, then extended into a long, flex- 

 uous flagellum, very slender distally. 



This genus is distinct from Uuri/desmus, Saussure, in the oblong body, 

 the dorsal pores, the unarmed sterna and femoral joints of the legs, 

 the unarmed fifth segment of the males, the single process of the sixth 

 segment, and that of the fifteenth segment; probably also in the 10 

 olfactory cones. The two genera probably have no close affinity, not- 

 withstanding the agreement in i)ore arrangement, the only character of 

 importance which they seem to possess in common. 



Eurydesmus is confined, as far as known, to South America, and the 

 indubitable generic distinctness of the African forms makes stronger 

 the probability that the two continents have little in common in the 

 way of Diplopoda. The present is probably one of many cases where 

 more careful study will show that the Diplopod genera are more circum- 

 scribed in their distribution than has been generally supposed. 



