34 Myriapoda of West Africa. 



striations on the anterior portion, just anterior to each of which is a row of 

 very small protuberances about as far from each other as the striations are 

 apart ; posterior portion of segments finely punctate, dorsally with poorly 

 defined longitudinally directed furrows, depressions, and ridges ; laterally 

 these become more pronounced and gradually take on the character of the 

 striations which are strongly developed on the sides and below ; well-devel- 

 oped striations appear above the pores on the anterior segments, but not on 

 the posterior. 



Repugnatorial pores located below the middle line of side, longitudinally 

 oval on the anterior segments, where the suture is curved away from them; 

 they are farther from the posterior margin than from the suture, which in 

 the posterior part of the animal is nearly or quite straight. 



Last segment posteriorly strongly contracted, rugose above on the small and 

 rather pointed, though broad, mucro which does not nearly cover the edges of 

 the anal valves. 



Anal valves rugulose, more coarsely wrinkled above and along the slightly 

 compressed, rather thick margins. 



Pre-anal scale with the exposed portion somewhat over three times broader 

 than long, the posterior margin rounded. 



Color of alcoholic specimen : median parts of head, posterior part of each 

 segment, anal valves, and pre-anal scale very dark brown, nearly black ; sides 

 of head, antennae, and legs of a more or less dark reddish-brown ; the anterior 

 portion of each segment shading into dirty yellow, all the colors paler below ; 

 sides of the posterior margin of the last segment yellow. 



Length 210 mm. ; greatest diameter 14 mm. ; 70 segments. 



Habitat. — One female specimen is labeled " Cape Town, Feb. 2, 

 1890." 



With the specimens which we have called tripartitus was a 

 female of about the same size as the above species, and differing 

 in the following characters : — 



Body more compressed laterally toward the posterior end, and attenuate for 

 a longer distance anteriorly ; transverse furrow of vertex curved, medianly 

 obscure ; the rugose area in front of the antennae more evident, and slightly 

 depressed ; upper row of punctations better developed, with blunt protuber- 

 ances at bottom ; lower row less in number, and less pronounced ; anterior 

 ventral corner of exposed surface of mandibulary stipe more produced ; eyes 

 62; anterior edge of promentum without a distinct median convexity, though 

 the general outline of the rather irregular margin is anteriorly convex. 



These differences do not seem to us of sufficient importance to 

 justify the establishment of another species, and yet it does not 

 appear advisable to combine the descriptions of the two specimens. 



This species, supposing the two specimens to belong to it, has its 

 most important difference from S. tripartitus in the characters of 



