COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 171 



Diagnosis: Carapace with a tuft of non-plumose setae on front; 

 carpus with scattered long plumose hairs and large coarse granules, its 

 anterior margin armed with a broad triangular lobe, nearly entire ex- 

 cept in small specimens; manus covered with long plumose hairs and 

 large coarse granules, and with a large granulate protuberance at base 

 of pollex ; walking legs covered with long plumose hairs ; telson five- 

 plated ; a pair of pleopods in male. 



Description: Carapace about as broad as long (very slightly broader 

 in females), strongly convex front to back, plicate on posterolateral re- 

 gions, otherwise punctate or with flattened granules; naked except for 

 traces of pubescence anteriorly, and very short, thick-set, non-plumose 

 setae on frontal region. Front narrow, sinuously triangular in dorsal 

 view, trilobate in frontal view, the median lobe strongly projecting. 

 Outer orbital angle produced into a broad tooth, sometimes spine- 

 tipped. Separated portion of side wall usually consisting of one small 

 piece. 



First movable segment of antenna with a tubercle at distal end of 

 anterior margin ; second and third granular ; f lagellum naked or with 

 vestigial hairs. 



Merus of chelipeds rugose and granular; anterior margin with a 

 broad, subtriangular, strongly projecting, granular lobe. Carpus with 

 a broad subtriangular lobe on anterior margin, highest near proximal 

 end ; it and rest of dorsal surface covered with scattered long plumose 

 hairs and large coarse granules; surface with three irregular longi- 

 tudinal crests, indistinct on some specimens. Manus and fingers with 

 large coarse granules; a large granular protuberance at base of pollex; 

 surface covered with long plumose hairs, somewhat more thickly than 

 on carpus, the hairs not extending onto fingers except for proximal 

 portion of pollex. Fingers gaping in major cheliped, meeting for entire 

 length in minor cheliped ; short plumose hairs along cutting edges, ex- 

 tending nearly to tips. 



All segments of walking legs with a thick fringe of plumose hairs 

 along anterior margins; dorsal surface of propodus covered with sim- 

 ilar hairs. 



Telson of abdomen with five plates. A pair of pleopods in male. 



Variations: In small specimens (about 5 mm and under) the tuber- 

 cle on the anterior margin of the first movable antennal segment is 

 often in the form of a spinule, and two similar spinules are present on 

 the second segment, one at either end of the anterior margin. In small 



