of Myriopoda f)-om Rodriguez. 445 



Genus Spirostreptus. 

 Spirost7'eptus avernus^ n. sp. 



Black, legs and antenna? castaneous ; forty -three dorsal seg- 

 ments ; first segment smooth, with narrow marginal ridge ; 

 remaining segments rugulose and depressed in front, smooth 

 behind, striated at the sides ; preanal segment produced into a 

 point behind. Length 13 lines, width 1 line. 



Cascade Valley. (Coll. by Gulliver.) 



Spirostreptus sorornuSy n. sp. 



Colour and general structure of the preceding ; forty-nine 

 dorsal segments, which are not rugulose in front. Length 



1 inch 9 lines, width 3 millims. 



(Coll. by Slater.) 



Possibly S. nigerrimus of Newport, only a fragment of 

 which now stands in the collection ; so that the number of 

 segments cannot be satisfactorily ascertained. 



Spirostreptus Gulliveri^ n. sp. 



Olivaceous ; dorsal region dark ; eyes black ; face, margins 

 of first dorsal segment, and hind margins of other segments 

 tawny ; legs reddish tawny ; fifty-seven dorsal segments, first 

 segment with square anterior angles, above which are four 

 depressed lines ; marginal ridge feebly developed ; each of 

 the remaining segments crossed by a depressed line, behind 

 which they are swollen ; sides striated as usual ; preanal seg- 

 ment slightly produced, with bisinuate hind margin. Length 



2 inches 4 lines, width 5 millims. 



(Coll. by Gulliver.) 



Spirostreptus simulans^ n. sp. 



Olivaceous ; a dorsal series of dark spots in front and a 

 continuous lateral series of blackish spots ; first segment 

 clouded with brown behind ; forty-three dorsal segments, first 

 segment with marginal ridge feebly developed ; remaining 

 segments rugulose and depressed in front ; preanal segment 

 regularly arched. Length 10^ lines, width 2 millims. 



(Coll. by Gulliver.) 



Genus Spiro BOLUS. 

 Spiroholus Hecate^ n. sp. 

 Shining black ; front margins of tlie segments below casta- 



