Myriopoda of Dominica. 479 



with a row of somewhat close-set setge, above which are three 

 setiferous pores, one in the middle and one on each side about 

 halfway between the middle and the lateral margin. 



First tergite with anterior border sloping gradually away 

 at the sides and not sharply marked off from the lateral mar- 

 gin ; the lateral and antero-lateral border (as far as the ocular 

 area) raised ; lateral portion marked with a more or less com- 

 plete sulcus, which runs from the anterior margin near the 

 ocular region backwards and slightly downwards to the pos- 

 terior margin ; above the posterior end of this there are about 

 six short sulci, which correspond with the longitudinal sulci 

 marking the infero-lateral portions of the somites. 



Each somite, except the last, divided into an anterior and a 

 posterior half by a shallow depression, which in many species 

 of the genus has the form merely of a streak ; foramina 

 repugnatoria situated in the middle of the sides of the somites 

 a little behind this depression. 



Anal tergite produced behind, so as to cover but not to 

 pass beyond the superior angle of the anal valves ; anal 

 valves but little prominent, with simple unraised borders ; 

 anal sternite with rounded posterior margins. 



Inferior surface of the legs sparsely hairy. 



Four female specimens. 



Length of adult not greater than 30 millim. 



Unfortunately all the specimens obtained are in a frag- 

 mentary condition, and it is consequently impossible to esti- 

 mate with exactness either the length of any one individual 

 or the number of somites of which it is composed. And, 

 further, the description is of necessity rendered additionally 

 imperfect owing to the fact that the absence of a male has 

 made it impossible to examine the copulatory apparatus of 

 that sex and to determine whether the species is referable to 

 the homomorphous or the heteromorphous group of the genus. 



The species appears to be allied to S-p. cinctus (Humb. & 

 Sauss.), but the latter is said to have a triangular subanal 

 plate. It also presents affinities with 8p. rotundanus and 8p. 

 'inelUtus (Karsch), but the descriptions of the latter do not 

 satisfactorily apply to it in all particulars. 



^ Sj)irohohis paraoisis, Humb. & Sauss. 



Spiroholus imraensis, Humb. & Sauss., Rev. et Mag. Zool. 1870, p. 176; 

 Miss. Sci. Mex. (Myriopodes), p. 81, pi. iv. fig. 15. 



Species without scobina. 



Segments slate-coloured above and at the sides, paler be- 



