1895. PROCEEDINGS OF THE NATIONAL MUSEUM. 51 



OXYDESMUS FLABELLATUS, new species. 



Head as described for 0. canqni, and soinewliat more liirsute. 



First segment not so decurved as iu 0. campii; anterior emargiua- 

 tions not evident; raised margin not distinct posteriorly; surface of 

 segment finely granular, uneven, but the granulation not nearly so 

 pronounced as in 0. ca))ipii, so that the surface appears smooth except 

 in the depressions; tubercles very minute, the anterior median pair 

 very close to the anterior margin; posterior row indistinguishable, sug- 

 gested only by slight unevenness of the posterior margin. 



Subsequent segments very similar to those of 0. vampil, but not so 

 long; the carinte are evidently shorter, the posterior margin of the 

 anterior and middle ones being directed slightly cephalad from the 

 horizontal, instead of slightly caudad, as is the case with the middle 

 segments of 0. eampii. The difierence in the length of the segments 

 is, however, still more evident on the posterior segments, the posterior 

 corners of which are more extended caudad in 0. jiahellaius. Surface 

 somewhat smoother than in 0. eampii, and the tubercles less distinct; the 

 arched median j)ortion more convex and somewhat shining; tubercles 

 visible to the naked eye on median segments, the areas obsolete, and 

 the transverse sulcus very nearly so. 



Below the cariniv the surface is less granular than in 0. canqyii, but 

 above the bases of the legs are two clusters of coarse papilliform 

 tubercles; that opposite the anterior leg has the tubercles more crowded 

 and shorter, and is placed on a rounded, cushion-like elevation. 



Anterior subsegments somewhat more finely rugulose-striate longi- 

 tudinally. 



Last segment somewhat fiabellate, the lateral margins evidently 

 divergent caudad; posterior marginal tubercle much larger than the 

 anterior, instead of subequal. 



Anal valves distinctly granular and vertically rugulose, the margins 

 also granular. Preanal scale with the median prominence of the same 

 shape as the setigerous tubercles, but much larger and longer. 



Sterna hirsute between the bases of the legs, the hairs rather scat- 

 tering, rising from small tubercles. 



Color in alcohol nearly black, with a slight brownish- vinous tinge, 

 concolorous; legs scarcely paler. 



Length, 65 mm.; width, 11.5 mm. 



Localifi/. — One male specimen from the vicinity of Stanley Pool, Congo 

 Free State, collected by Rev. J. H. Camp, in the National Museum 

 collection. 



As may be judged from the description, this species is evidently 

 related to 0. eampii, from which it seems distinct in the characters 

 noted. 



The description was drawn with specimens of both species in hand, 

 and that of 0. eampii may be supposed to apply to <). Jiabellatus, except 

 where modified in the description of the latter. 



