232 bulletin: museum of comparative zoology. 



its origin coils ventrad and then proximad against the distal end of 

 the branch, then running mesad and curving into a loop at the end. 



The general color of the poorly preserved type is brownish above, 

 with the keels lighter. 



The keels are but little extended with the caudal process in posterior 

 region unusually small. 



The size is small, the exact length not being ascertainable. Width 

 (male type), 2.2 mm. 



186. Amphelictogon couloni (Humbert and Saussure). 

 Polydesmus couloni Humbert et Saussure, Rev. mag. zooL, 1869, p. 151.^ 

 Habitat. — Cuba.^ 



187. Amphelictogon subtekreaneus (Saussure). 

 Polydesmus subterreaneus Saussure, Linn, ent., 1869, 13, p. 323.^ 

 Habitat. — Cuba.^ 



Caraibodesmus, gen. nov. 



This genus covers in part the ground of Odontopeltis as used by 

 Pocock in his treatment of the West Indian poly desmoids. But 

 Pocock proposes Odontopeltis as a substitute for the preoccupied 

 name Rachophorus Koch, the type of which, Polydesmus conspcrsus 

 Perty, is a Brazilian species of uncertain position but certainly not 

 congeneric with the West Indian species. 



This genus is readily distinguished by the structure of the male 

 gonopods. In this the lower or principal seminiferous branch is a 

 rather broad simple blade, sometimes bent and often expanded at 

 the distal end but produced into a style or other elongate slender 

 process. The accessory upper branch is in comparison very short ; 

 it may be double but is not produced into a slender blade or process; 

 it commonly lies close against the upper surface of the lower branch. 



Antennae long and slender. 



Metazonites commonlv crossed bv a furrow caudad of which there 



