100 EAST AFRICAN POLYDESMOIDEA—COOE. 



Description. — Body moderately large, about five times as long as 

 broad, broadest about the fifth segment, tapering very gradually caudad, 

 cavity circular. 



Vertex prominent, rough ; sulcus very deep. 



Antennie scarcely clavate; third joint nearly as long as second; 

 joints in order of length 6, 2, 3, 4=5, 1, 7. 



Mouth parts probably as in Oxydesnins. 



First segment subcrescentic (shorter than in Oxydesmus), much 

 broader than the head and slightly narrower than the second segment, 

 with three transverse rows of distinct tubercles. 



Segments with dorsal surface granular rugose; three transverse rows 

 of conic tubercles, each (except on some anterior segments) located in a 

 distinct area. Posterior row of areas oblong, the others rounded or 

 subsquare. 



Segments 1-4 with the two middle tubercles of the last row coalesced 

 and hypertrophied into a large conic process bifid at apex, the neigh- 

 boring granules sharing more or less in the elevation. 



Lateral cariuie thin, inserted about three-quarters up, in width equal 

 to about one- half the body cavity; anterior carinfe curved somewhat 

 forward, the posterior with the corners more and more produced 

 caudad. Margin more or less distinctly dentate or sinuate, with a dis- 

 tinct intramarginal ridge. 



Repugnatorial pores opening dorsally in a depression between the 

 margin and the intramarginal ridge of segments 5, 7, 9, 10, 12, 13, 

 15-19, surrounded by a fine raised rim. 



Below the carinas the posterior subsegments are more or less tuber- 

 culate along the margins and prominent above the insertion of the legs. 



Anterior subsegments finely coriaceous. 



Supplementary margin long, membranous, very finely striate longi- 

 tudinally, not i)ectinate. 



Last segment rugose on its posterior portion, which is broad and 

 subqnadrate; with three setigerous tubercles along the margin on each 

 side of the truncate, minutely dentate apex. Two dorsal setigerous 

 tubercles, two apical and two subai^ical. The lateral setigerous tuber- 

 cles large, conic, especially the superior, which has the appearance of 

 a carina. 



Anal valves with two setigerous tubercles, the upper placed on the 

 raised margin, the lower somewhat removed from it. 



Preanal scale broadly triangular, with a prominent setigerous 

 tubercle on each side near the apex. 



Second pair of legs of male with the coxte somewhat produced 

 medianly. 



Male genitalia rising from a small aperture ; basal joint small, hirsute; 

 apical portion large, twisted, complex, not inserted under the edge of 

 the aperture as in Oxydesmus. 

 Segments of adult, 20. 



