COMPLETE HAIG: EASTERN PACIFIC PORCELLANIDAE 127 



present on the manus of both chelipeds, as in N. hicapillatuin, but may 

 occur on one, both, or neither manus, their presence on both being 

 predominantly a female characteristic. In the Atlantic species the num- 

 ber of plates in the telson of the abdomen appears to be variable in 

 both sexes, specimens having been observed in which it was five-, 

 seven-, or partially seven-plated. Like the related Pacific coast spe- 

 cies, A'^. curacaoense has a pair of pleopods in the male. 



Remarks: The specific name is from the Latin bi-, twice, doubly, 

 and capillatus, hairy, in reference to the presence of long hairs on the 

 manus of both chelipeds. 



Range: Known from only two mainland stations, at Puerto Utria, 

 Colombia, and La Libertad, Ecuador; Galapagos Islands. 



Neopisosoma mexicanum (Streets), new combination 

 Plate 30, fig. 2 

 Pachycheles ynexicanus Streets, 1871a, p. 225, pi. 2, fig. 1 (type local- 

 ity, Golfo de Tehuantepec, Mexico). Ortmann, 1897, pp. 292, 293. 

 Haig, 1957b, p. 3. Not Moreira, 1901, pp. 32, 91. 



Previous records: 

 Mexico. Golfo de Tehuantepec: (Streets). 

 Panama. Guayabo Chiquito: Askoy (Haig). 

 Colombia. Bahia Limon, Golfo de Cupica: Askoy (Haig). 



Diagnosis: Chelipeds covered with flattened granules; dorsal sur- 

 face of carpus with three low, often obsolescent crests; anterior margin 

 of carpus with three conical teeth occupying the proximal half or two- 

 thirds of margin; manus of major cheliped with a short pubescence, 

 that of minor cheliped usually thickly covered with long hairs; telson 

 seven-plated ; a pair of pleopods in male. 



Description: Carapace about as broad as long, regions distinct; 

 plicate on posterolateral regions, otherwise punctate or faintly granular, 

 naked except for traces of pubescence on frontal region. Front rather 

 strongly projecting and arcuate in dorsal view, in frontal view trilobate, 

 median lobe produced and strongly deflexed. Side wall extending to 

 epibranchial level, with a narrow posterior projection continuing to level 

 of mesobranchial region. 



First movable segment of antenna with a crest on anterior margin, 

 low to strongly projecting; second finely granular; third nearly smooth; 

 flagellum with short hairs. 



