No. 403.] WORTH-AMERICAN INVERTEBRATES. 585 
C. Eyestalks stout. Chele in male somewhat unequal Ocypode 
C'. Eyestalks slender. Chelz in male extremely unequal . Uca 
B’. Lateral margins toothed. 
C. Lateral margins parallel or nearly so. . . Euchirograpsus 
C. Postero-lateral margins posteriorly converging . Euryplax 
A’. Carapace with antero-lateral margins arcuate. Eyestalks of moderate 
engt 
B. C with margins spinous vui ER . Geryon 
B'. Carapace with margins feebly dana etd pra Spbacacinus 
Fic. 1. — Ocypode albicans, carapace. Fic. 2. — Ocypode albicans, chela. 
THE SPECIES OF OCYPODID/E. 
Genus Ocypode Fabricius . . . . . . . . O, albicans Bosc, MSG 
= O. arenaria Say 
Genus Uca Leach. 
Key to Spectes. 
4. Inner surface of palm of large cheliped without an oblique ridge. 
B. Carapace very short, broad, and convex. Abdomen of male wide, 
increasing noticeably in width towards proximal end 
U. subcylindrica (Stimpson), G ! 
B'. Carapace of moderate width and convexity. Abdomen of male 
of moderate width, its sides subparalle 
U. pugilator (Bosc), M.SG 
A’. Inner surface of palm with an oblique ridge. 
B. Oblique ridge terminating at carpal cavity. 
C. Front (between the eyes), very shallow and broad. Claws 
with red spots at the articulations 
U. minax (Le Conte), MSG 
C'. Front narrow, its sides oblique. 
D. Eyebrow (or surface between the orbit and the dorsum) 
nearly vertical scarcely visible in a dorsal view. 
Space on inner surface of palm, between carpal cavity 
and dactylus, coarsely granulate 
U. pugnax (Smith), MSG 
D’. Eyebrow inclined, visible in a dorsal view. Space be- 
tween carpal cavity and dactylus finely granulate 
U. pugnax rapax (Smith), G 
1 Texas. 
