COMPLETE HAIG: EASTERN PACIFIC PORCELLANIDAE 133 



Key to the Eastern Pacific Species 



la. Carapace with a distinct tuft of hairs on front, or surface cov- 

 ered with distinct hairs 2 



lb. Carapace devoid of hairs, or at most with traces scarcely visible 



except under magnification 13 



2a. Front with a distinct tuft of hairs 3 



2b. Front without a distinct tuft, but hairs sometimes present. . 10 



3a. Carpus and manus each with 3 longitudinal rows of large flat- 

 tened tubercles, the spaces between them filled with a short 

 pubescence monilifer 



3b. Chelipeds without rows of large tubercles as in 3a. ... 4 



4a. Manus with a large granulate protuberance at base of pollex ; 



telson with 5 plates in both sexes 5 



4b. No distinct protuberance on manus at base of pollex; telson 



7-plated in males, 7- or 5-plated in females 6 



5a. Carpus with a broad triangular lobe ; front with a tuft of non- 

 plumose setae; chelipeds with long, scattered plumose hairs. 

 rudis 



5b. Carpus with a broad serrate-edged lobe ; front with a tuft of 

 plumose hairs; chelipeds with short, thick-set plumose hairs. 

 holosericus 



6a. Frontal tuft composed of plumose hairs only; manus nearly 

 naked or with plumose hairs, scattered non-plumose setae some- 

 times interspersed with them ; telson of female 7-plated. . 7 



6b. Frontal tuft composed of mixed plumose and non-plumose 

 hairs ; manus covered with long, stifif, non-plumose setae ; telson 

 of female 5- or incompletely 7-plated 9 



7a. Carpus with 2 teeth ; chelipeds nearly naked or with plumose 

 hairs, but no non-plumose setae ; male pleopods present. 

 grossimanus 



7b. Carpus with 3-4 teeth; chelipeds (manus of minor chelipeds, 

 at the very least) thickly covered with plumose hairs, and scat- 

 tered, long non-plumose setae interspersed with them. . . 8 



8a. Non-plumose setae mixed with plumose pubescence on manus 

 of both chelipeds ; male pleopods present. . . pubescens 



8b. Non-plumose setae mixed with plumose pubescence on manus of 

 minor cheliped, that of major cheliped with plumose pubescence 

 only ; no male pleopods crinimanus 



