THE GBAPSOID CRABS OF AMERICA. 377 



F*. Front narrower, less than one-third of fronto-orbitnl width. 

 G 1 . Oblique tuberculate ridge on inner surface of larger palm of 



male terminating at carpal cavity. 



H 1 . Eyebrow nearly vertical, scarcely visible in a dorsal view. 

 Space between carpal cavity and dactylus coarsely gran- 

 ulate pvgnax, p. 395. 



H". Eyebrow Inclined, visible in a dorsal view. Space between 

 carpal cavity and dactylus finely granulate. 



pugnax rapax, p. 397. 

 G 1 . Oblique tnberculate ridge not terminating at carpal cavity, but 



continued upward with an angular turn. 

 H 1 . Side margins strongly convergent posteriorly. 



macrodactylus, p. 404. 

 H a . Side margins moderately convergent. 



J 1 . Merus joints of legs not enlarged brevifrons. p. 393. 



J*. Merus joints of legs enlarged galapagcnsis, p. 403. 



D". No oblique tuberculate ridge on Inner surface of palm, extending 



upward from lower margin pugilator, p. 400. 



C*. Anterior part of side margins straight, or nearly so, and continued 



thence backward with an angular turn. 



D*. An oblique tuberculate ridge on inner surface of palm extending 

 upward from lower margin. 



E*. Oblique ridge terminating at carpal cavity Uruguay cnsis, p. 413. 



E 1 . Oblique ridge not terminating at carpal cavity but continued up- 

 ward with an angular turn. 

 F*. A spine or tooth on inner surface of carpus. Oblique ridge very 



prominent spinicarpn, p. 411. 



F*. No spine on inner surface of carpus. Oblique ridge moderately 



prominent. 

 G*. Oblique ridge and proximal ridge at base of dactylus meeting 



above ocrstcdi, p. 414. 



G*. Oblique ridge and proximal ridge at base of dactylus not 



meeting. 



H 1 . Upper surface of palm turned abruptly at right angles with 

 outer surface and forming a flat or concave surface. 



coloradensis, p. 410. 



H*. Upper surface of palm rounding gradually Into outer surface. 

 J*. Upper margin of palm with a carina. 

 K 1 . Proximal ridge at base of dactylus almost at right angles 



to lower margin crcnulata, p. 409. 



K 1 . Proximal ridge at base of dactylus very oblique to lower 



margin spcdosa, p. 408. 



J J . Upper margin of palm without carina hclleri. p. 415. 



D*. No oblique tuberculate ridge on inner surface of palm extending up- 

 ward from lower margin panamcnuis, p. 412. 



B*. Carapace very convex, semicylindrical. 

 C 1 . An oblique tuberculate ridge on inner surface of palm extending upward 



from lower margin. 



D 1 . Third to sixth abdominal segments in male more or less fused. 

 E 1 . Carapace little narrowed behind. 



F 1 . An oblique stridulating ridge nnar proximal lower corner of inner 

 surface of large palm of male. Upper margin of orbit little 

 oblique musica, p. 417. 



