366 



PROCEEDINGS OF THE NATIONAL MUSEUM 



in which one spine lies above (distal to) other, giving bifui'cate appear- 

 ance in lateral view. Additional armature of male antenna terminal 

 process a bifurcate part in distal region, overlying first, double-spined, 

 part and at right angles to it. Second part bearing single, knoblike 

 projection on anterior surface and one on posterior surface, just 

 proximal to distal part of terminal process. Male with distinct indi- 

 cations of pau" of adhesion pads posterior to mouth cone. Third 

 thoracic leg with 2-segmented exopodite but armature of second 

 segment not reminiscent of Dentigryps with 3-segmented exopodite 

 as is that of D. curtus. 



' The hook-shaped process on the medial outer surface is considered as an extension of the segment, not 

 part of the associated armature. Hairlike processes are scattered over the surface of the protopodite but are 

 not recorded in this table. 



Discussion of the Species 



The shape of the cephalothorax is similar in all four species although 

 that of the larger species, D. ulua, is slightly more elongate. The 

 anterior region of the lateral cephalothoracic margin is sharply in- 

 dented in the male of D. ulua and in the female and male of D. curtus 

 and D. litus, and it forms a posteriorly-directed, spikelike projection 

 not present in the female of D. ulua or in the female and male of D. 

 hi;furcatus. 



The free fourth pedigerous segpient is partially covered by the 

 cephalothorax in the male of D. bifurcatus and is almost if not com- 

 pletely covered in both the female and male of D. curtus and D. litus. 

 The segment is not covered in D. ulua and in the female of D. bi- 

 furcatus. The dorsal cuticle of the fourth pedigerous segment of 

 the female and male D. ulua and D. bifurcatus appears as an indis- 

 tinct platelike structure. The junction between the fourth pedi- 

 gerous segment and genital segment is indistinct and incomplete in 

 the female of D. bifurcatus, D. curtus, and D. litus. 



