COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 147 



Glassell (1937) placed Pisosoma aphrodita Boone in the synonymy 

 of Pachycheles biocellatus. The types of Pisosoma aphrodita and the 

 neotypes of Pachycheles biocellatus, all of which were formerly in the 

 collection of the New York Zoological Society, are now housed in the 

 American Museum of Natural History. 



Range: Isla Espiritu Santo, Gulf of California, south to Isla La 

 Plata, Ecuador; Isabel, Tres Marias, Revillagigedo, Clipperton, and 

 Galapagos Islands. Shore to 4 fathoms. 



Pachycheles vicarius Nobili 

 Plate 32, fig. 2 

 Pachycheles vicarius Nobili, 1901b, p. 19 (type locality, Bahia de 

 Santa Elena, Ecuador). Rathbun, 1910, p. 601. Haig, 1957b, p. 4. 



Previous records: 

 Colombia. Bahia Humboldt; Isla Gorgona: Askoy (Haig). 

 Ecuador. Bahia de Santa Elena: E. Festa (Nobili). 



Diagnosis: Carapace practically devoid of hairs; surface of carpus 

 with four strong crests defined by deep, narrow grooves, anterior mar- 

 gin with three or four broad, strongly projecting teeth; manus with 

 four similar crests; walking legs thickly covered with plumose hairs; 

 telson seven-plated in males, five-plated or incompletely seven-plated in 

 females; a pair of pleopods in male. 



Description: Carapace slightly broader than long (1.1 times in 

 males, 1.2 or 1.3 in females) ; plicate on posterolateral regions and 

 usually on frontal regions also, otherwise smooth or lightly punctate; 

 devoid of hairs or with slight traces on frontal region, visible only 

 under high magnification. Front slightly rounded in dorsal view ; trilobate 

 in frontal view, the lateral lobes broad, transverse, median one narrow, 

 conical and slightly produced. Outer orbital angle produced into a 

 small sharp tooth. Separated portion of side wall consisting of one large 

 piece. 



First movable segment of antenna with a low tubercle on anterior 

 margin ; second and third nearly smooth ; flagellum naked. 



Merus of chelipeds faintly rugose, with a broad, strongly project- 

 ing, subtriangular lobe on anterior margin. Carpus with three or four 

 broad, strongly projecting, smooth-margined teeth on anterior mar- 

 gin, proximal one the largest, others progressively smaller; dorsal sur- 

 face with four strong crests, defined by deep, narrow grooves: anterior 

 crest broadest, composed of large, flattened, transverse, elliptical tu- 



