COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 63 



Description: Carapace flattened, posterolateral regions plicate, 

 otherwise nearly smooth ; faintly pubescent anteriorly. Front trilobate, 

 lateral lobes narrow, pointed, and diverging, median lobe broad, with 

 a deep median sulcus. Outer orbital angle only slightly produced. No 

 epibranchial spine. 



First movable segment of antenna with a distinct, truncate lobe; 

 second granular; third nearly smooth; flagellum with short hairs. Outer 

 maxillipeds smooth or punctate. 



Chelipeds covered with rough granules. Merus with a large, strongly 

 projecting lobe on anterior margin. Carpus about twice as long as wide, 

 proximal half or two-thirds of anterior margin armed with about four 

 low, well separated, roughly granular lobes; surface with large gran- 

 ules; a low crest on posterior margin, ending distally in a long projec- 

 tion. Manus with rough granules; outer margin with narrow, elongate 

 tubercles, and with a broad, thick fringe of soft plumose hairs extend- 

 ing from proximal end to about half way onto pollex or nearly to tip 

 of latter; surface without pubescence. Fingers in the two chelipeds 

 markedly dissimilar in males, less distinctly so in females and young: 

 in one cheliped, dactylus very narrow, pollex broad and truncate, 

 fingers meeting for entire length, gape without pubescence ; in the other 

 cheliped, dactylus broader, hooked, pollex rounded at tip, fingers gap- 

 ing, gape sometimes with a long, thick tuft of pubescence confined to 

 proximal end of dactylus. 



Walking legs flattened, faintly rugose, all segments thickly hairy. 

 Merus without spines, not inflated; carpus with rough granules or 

 spinules on anterior margin. 



Material examined: See Table 15. 



Measurements: Males, 3.0 to 9.6 mm; non-ovigerous females, 2.9 to 

 7.3 mm ; ovigerous females, 4.6 to 8.8 mm. The male holotype measures 

 7.2 mm in length, 7.0 mm in breadth; an ovigerous female paratype, 

 7.5 by 7.3 mm. 



Color: In life, thickly mottled with dark brown and red; tips of 

 chelae light red; tomentum and fingers a dirty white. (Glassell, 1936) 

 A characteristic feature of the species is a strong, dark brown or black 

 stripe on the dactylus of the walking legs. 



Ecology: Under rocks in the littoral, low and half tide levels. The 

 specimen from Colombia was taken from sponge. 



Ovigerous females have been collected in February, March, April, 

 and December. 



