182 bulletin: museum of comparative zoology. 



85. Orthoporus abstemius (Karsch). 

 Spirostreptus abstemius Karsch, Zeits. natunviss., 1881, ser. 3, 6, p. 36.' 



Hahitat— ?Cuba.i 



85a. Orthoporus nitidus (Daday). 



Spirostreptus nitidus Dadaj', Term, fiizetek, 1891, 14, p. 137. ' 



Habitat. — Trinidad^: near Port of Spain. (R. Thaxter). 

 / 



86. Orthoporus antillanus (Pocock). 



Spirotreptus antillanus Pocock, Journ. Linn. see. London, 1894, 24, p. 483,. 

 pi. 38, f. 1-11.1 



Habitat. — St. Thomas.^ ?Grenada.^ 



86a. Orthoporus tobagoanus, sp. nov. 



Type.— M. C. Z. 4,334. Parat2jpcs.— M. C. Z. 4,341. Tobago,, 

 1916. W. E. Broadway. 



This species may be distinguished from 0. nitidus (Daday) of 

 Trinidad, to which it is very close, in ha\ing the distal lateral process 

 of the gonopod of male much shorter and more inconspicuous, as well 

 as in various other minor details of the gonopod. The color is typi- 

 cally much lighter brown, and not so distinctly banded. Legs much 

 lighter instead of being dark and almost concolorous with the body, 

 yellow to ferruginous. One male appears somewhat mottled with 

 lighter color along the sides. Antennae brown to chestnut. Sculp- 

 turing of somites similar but weaker. 



Number of segments, fifty-seven or fifty-eight as against sixty or 

 sixty-one in 0. nitichis. 



Smaller than 0. nitidus, the length of the type, the largest of the 

 specimens secured, being about 90 mm., with the diameter 6 mm. 



