COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 161 



Diagnosis: Carapace with a tuft of plumose hairs on front; chel- 

 ipeds with three longitudinal rows of large, flattened, imbricate tuber- 

 cles, spaces between tubercles filled with a fine, short pubescence; 

 carpus with three distinct tubercle-covered teeth on anterior margin; 

 fingers of major cheliped widely gaping, hiatus fil'cd with a long, thick 

 tuft of plumose hairs; walking legs thickly covered with long plumose 

 hairs ; telson five-plated ; no pleopods in male. 



Description: Carapace about as broad as long in males, very slightly 

 broader in females; posterolateral regions plicate, rest of surface punc- 

 tate; a tuft of fine plumose hairs extending beyond margin of front, 

 carapace otherwise devoid of hairs except for traces visible under high 

 magnification. Front narrow, rounded in dorsal view, trilobate in fron- 

 tal view, the median lobe produced. Outer orbital angle produced into 

 a strong tooth. Separated portion of side wall usually consisting of one 

 large piece and a number of fragments. 



First movable segment of antenna slightly roughened, with a tuber- 

 cle on anterior margin; second and third nearly smooth; flagellum 

 naked. 



Merus of chelipeds rugose, a few large, flattened tubercles near 

 posterior margin, anterior margin with a low, subtriangular lobe cov- 

 ered with rugae. Anterior margin of carpus with three distinct tubercle- 

 covered teeth, the proximal one largest; surface covered with large, 

 flattened, imbricate tubercles, arranged in three more or less regular 

 longitudinal rows; a fourth row of much elongated tubercles along pos- 

 terior margin ; spaces between the tubercles filled with a fine, thick, short 

 pubescence. Manus with three longitudinal rows of similar tubercles, 

 the outer row double and extending onto pollex; several smaller tuber- 

 cles near inner margin, and a row of elongated ones along outer margin, 

 extending into strong rugae covering the outer part of the ventral sur- 

 face; spaces between tubercles filled with pubescence, as in carpus. 

 Dactylus with tubercles and flattened granules nearly to tip. Fingers of 

 major cheliped gaping, not nearly meeting, the hiatus filled with a long, 

 thick tuft of plumose hairs; fingers of minor cheliped meeting entire 

 length or nearly so, gape with only traces of pubescence. 



Anterior margin of merus of walking legs with a thick, long fringe 

 of fine plumose hairs; similar hairs on dorsal surface, as well as an- 

 terior margin, of three following segments. 



Telson of abdomen with five plates. No pleopods in male. 



Variations: In small specimens, the tubercles on the chelipeds tend 

 to be lower and less imbricate, and the felty pubescence between them 



