Trapezia cymodoce ferruginea Latreille 491 



Trapezia digitalis Latreille . 493 



Ouadrella nitida Smith ......... 494 



Maldivia galapagensis Garth 495 



Family Pinnotheridae 497 



Subfamily Pinnotherinae 497 



Parapinnixa glasselli Garth . . 497 



Subfamily Pinnothereliinae 497 



Pinnixa transversalis (Milne Edwards and Lucas) . . 497 



Pinnaxodes chilensis (Milne Edwards) 498 



Family Cymopoliidae 499 



Cymopolia cortezi Crane 499 



Cymopolia lucasii (Rathbun) 5D0 



Cymopolia fragilis Rathbun 501 



Cymopolia <velerae Garth 503 



Family Grapsidae 504 



Subfamily Grapsinae 504 



Grapsus grapsus (Linnaeus) 504 



Geograpsus li'vidus (H. Milne Edwards) 506 



Pachygrapsus transversus (Gibbes) 507 



'\Plancs minutiis (Linnaeus) 510 



Subfamily Varuninae 511 



Euchirograpsus americanus A. Milne Edwards . . . 511 



Subfamily Plagusiinae 512 



fPlagusia immaculata Lamarck 512 



Percnon gihbesi (Milne Edwards) 512 



Family Ocypodidae 514 



Subfamily Ocypodinae 514 



Ocypode gaudichaudii Milne Edwards and Lucas . . 514 



Uca galapagensis Rathbun 515 



Uca helleri Rathbun 517 



Literature Cited 518 



Explanation of Plates 523 



IV 



