256 University of California Publications in Zoology [Vol. 23 



Key to the California Species of Pinnixa 



I. Daetylus of third ambulatory leg strongly falcate, the corneous tip bent at an 

 angle to the general outline of the segment. Females much larger and 

 softer than the males. 



A. Merus of third ambulatory leg of male more than twice as long as wide. 



Fingers of female not gaping; immovable finger of male horizontal. 

 Carapace oblong, about one and one-half times as wide as long.. 

 (Not known south of San Pedro.) 



faba, p. 259. 



B. Merus of third ambulatory leg of male twice as long as wide. Fingers 



of female gaping; immovable finger of male deflexed. Carapace 

 pointed at sides, about twice as wide as long. 



littoralis, p. 260. 



II. Daetylus of third ambulatory leg straight or slightly curved, the corneous tip 

 continuing the general line of the segment. 



A. Fourth ambulatory leg when extended not reaching end of merus of 



third ambulatory leg; third ambulatory leg enormously large in pro- 

 portion to body. Carapace very wide, nearly three times as wide 

 as long. 



1. Chela stout. Propodus of second ambulatory leg wide. (Not known 



south of Laguna Beach.) 



longipes, p. 257. 



2. Chela feeble. Propodus of second ambulatory leg narrow. 



tubicola, young, p. 265. 



B. Fourth ambulatory leg when extended reaching end or beyond end of 



merus of third leg. 



1. Propodus of third ambulatory leg about as wide as long. 



a. Carapace of female twice as wide as long. Propodus of last two 



legs squarish, much wider at distal end than proximal end 

 of daetylus. Male not known. (Not known north of San 

 Clemente Island.) 



tomentosa, p. 258. 



b. Carapace of female two and one-half times as wide as long; of 



male twice as wide as long. Propodus of last two legs taper- 

 ing at distal end almost to width of proximal end of daetylus. 



tubicola, p. 265. 



2. Propodus of third leg distinctly longer than wide. 



a. Carapace very convex, sloping from the middle in all directions; 



slightly more than one and one-half times as wide as long. 

 Chela with immovable finger, thumb, strap-shaped ; hand much 

 widened toward distal end; fingers with wide triangular gape. 

 (Not known north of Venice, California.) 



barriliarti, p. 261. 



b. Carapace more or less flattened, not sloping from the middle in 



all directions. Immovable finger not strap-shaped but dimin- 

 ishing from base, 

 i. Chela with immovable finger markedly deflexed. Carapace 

 about twice as wide as long. 



occidentalis, p. 262. 



