358 U.S. NATIONAL MUSEUM BULLETIN 236 



Because of the general resemblance of this new species with 



0. armiger (Gurney), this species too has been redescribed. 



The following keys can be used to discriminate between the various 

 species of the, now restricted, genus Onychocam'ptus . 



Key to the Species of Onychocamptus 



FEMALES 



1. Baso-endopodite of leg 5 with 4 or 5 setae 2 



Baso-endopodite of leg 5 with 3 setae 6 



2. 3rd exopodal segment of leg 2 with 2 external marginal spines 3 



3rd exopodal segment of leg 2 with 3 external marginal spines 4 



3. Segment 2 of antennule with externally directed spine. Lateral swellings on 



cephalic somite each with backwardly directed spine. Endopodite of 



maxillipede a huge claw O. gladiator, new species 



Segment 2 of antennule smooth. No spine on lateral swellings of cephalic 

 somite. Endopodite of maxillipede slender . . . . O. armiger (Gurney) 



4. 3rd exopodal segment of leg 4 with 3 external marginal spines. 



O. mirabilis (Gurney) 

 3rd exopodal segment of leg 4 with 2 external marginal spines 5 



5. Distal margin of 4th abdominal somite dorsally With 3 or 4 bifid teeth. 



O. horridus (Norman) 

 Distal margin of 4th abdominal somite dorsally with 2 bifid teeth. 



O. brevispinosus (G. O. Sars) 



6. Exopodite of leg 5 more or less fused to baso-endopodite, no articulation is 



present 7 



Exopodite and baso-endopodite of leg 5 distinctly articulating 8 



7. 3rd exopodal segment of leg 4 with 3 external marginal spines. 



O. bengalensis (Sewell) 

 3rd exopodal segment of leg 4 with 2 external marginal spines. 



O. besnardi Jakobi 



8. Setae of leg 5 short and spiniform O. talipes (C. B. Wilson) 



Setae of leg 5 normally developed. 



O. mohamnied (Blanchard and Richard) 



MALES 



1. Exopodite of leg 5 fused with baso-endopodite 2 



Exopodite of leg 5 free and articulating with baso-endopodite 3 



2. 2nd endopodal segment of leg 3 with external spiniform prolongation. 



O. besnardi Jakobi 

 2nd endopodal segment of leg 3 without external prolongation. 



O. bengalensis (Sewell) 



3. 3rd exopodal segment of leg 2 with 2 external marginal spines. 



O. armiger (Gurney) 

 3rd exopodal segment of leg 2 with 3 external marginal spines 4 



4. 2nd endopodal segment of leg 3 without external spiniform prolongation . . 5 

 2nd endopodal segment of leg 3 with external spiniform prolongation ... 6 



5. Exopodite of leg 5 with 3 setae O. chathamensis (G. O. Sars) 



Exopodite of leg 2 with 2 setae O. talipes (C. B. Wilson) 



6. Body smooth, haired, but without spines. 



O. mohammed (Blanchard and Richard) 

 Body with big, backwardly directed spines . . . . O. horridus (Norman) 



