134 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.24 



9a. Carpus with a broad serrate-edged lobe, surface nearly smooth 

 except near posterior margin ; chelipeds with non-plumose 

 setae only; male pleopods present. . . . subsetosus 

 9b. Carpus with 3-4 teeth, surface covered with small tubercles; 

 chelipeds with tufts of long, non-plumose setae surrounded by 

 short plumose hairs; no male pleopods. . spinidactylus 



10a. Front rounded in dorsal view; carpus with 2 teeth; telson 



7-plated in males 11 



10b. Front shallowly trilobate in dorsal view ; carpus with 3-5 teeth ; 



telson 5-plated (male of velerae unknown) 12 



11a. Chelipeds with non-plumose setae only ; walking legs with non- 

 plumose setae ; male pleopods present. . . panamensis 



lib. Chelipeds covered with non-plumose setae, plumose hairs near 

 outer margins; walking legs with plumose hairs; no male 

 pleopods trichotus 



12a. Inner half of carpus nearly smooth, outer half with 3 longi- 

 tudinal rows of projecting granules; chelipeds with tufts of 

 short, plumose bristles marcortezensis 



12b. Inner half of carpus with a series of transverse ridges, outer 

 half with 3 longitudinal rows of strongly projecting granules, 

 series of transverse ridges between the rows ; chelipeds with 

 scattered long, non-plumose setae velerae 



13a. Carpus and manus with strong crests and grooves. . vicarius 



13b. No strong crests and grooves on dorsal surface of chelipeds. 14 



14a. Carpus and manus nearly smooth, manus with a distinct groove 

 near outer margin biocellatus 



14b. Carpus and manus covered with granules 15 



15a. Carapace smooth, shining, very strongly convex front to back; 

 dactylus of walking legs with 2 strong fixed spines on posterior 

 margin in addition to terminal claw. . . . crassus 



15b. Carapace not markedly convex; dactylus of walking legs with- 

 out fixed spines 16 



16a. Carpus and manus thickly covered with long plumose hairs, 

 fingers naked. setimanus 



16b. Chelipeds devoid of hairs, or at most with traces of pubescence. 17 



17a. Carpus with a broad lobe armed with about 8 small teeth or 

 serrations ; walking legs almost devoid of hairs ; telson 5-plated 

 in both sexes ; male pleopods present chacei 



