COMPLETE HAIG: EASTERN PACIFIC PORCELLANIDAE 131 



there is a large median white area on the carpus and some white on 

 the outer side of the manus ; the tips of the fingers are white. This 

 pattern was observed in specimens from several Mexican localities, and 

 is probably characteristic of the species in life. 



Ecology : Mexican specimens were collected in the littoral ; those 

 taken by E. Y. Dawson may have been washed from algae. The single 

 specimen from Panama was recovered from coral dredged in 2-4 fa- 

 thoms. 



Ovigerous females were collected in December, January, and March. 



Relationships: Neopisosoma dohenyi is most closely related to a 

 west Atlantic species, A^. angustifrons (Benedict), 1901, which like it 

 has the chelipeds covered with rough granules, lacks crests on the carpus, 

 has a five-plated telson, and lacks male pleopods. In N. angustifrons 

 there are two rows of enlarged granules or small tubercles near the 

 outer margin of the manus and extending onto the pollex; the carpal 

 teeth are less projecting than in A'^. dohenyi; and the side walls of the 

 carapace have a narrow, curved posterior projection extending to the 

 mesobranchial level. 



It was noted that some alcoholic specimens of N. angustifrons had 

 a color pattern very similar to that of N. dohenyi. 



Remarks : The new species is named for Mr. Patrick A. Doheny, who 

 sponsored the expedition on which the holotype was taken, along with 

 many other materials of scientific interest. 



Range: Cabo San Lucas and Mazatlan at the mouth of the Gulf of 

 California, south to Bahia Pinas, Panama. 



PACHYCHELES Stimpson 1858 



Pachycheles Stimpson, 1858, p. 228 (type species Porccllana grossi- 



mana Guerin, 1835, by original designation). 

 Pisosoma Stimpson, 1858, p. 228 (type species Porcellana pisum H. 



Milne Edwards, 1837, by original designation). 



Carapace rounded or subquadrate, usually about as broad as long 

 in males, a little broader than long in females. Side walls incomplete, 

 the posterior portion consisting of one or more pieces separated by 

 membranous interspaces. Front not prominent, usually rounded or 

 transversely sinuate in dorsal view, trilobate in frontal view. Eyestalks 

 short and stout, retractile. 



