16 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
and finger subexcavate, the latter spinose above. Ambulatory feet compressed and armed with stiff 
black bristles. Posterior angle of merus of last pair rounded, in the other feet dentate. 
Dimensions of male: Length, 48 mm.; width, 57.5 mm.; width of front, 28.6 mm. 
Bahamas and Florida Keys to Rio de Janeiro; Pensacola in fish stomach ; Bermudas; West Africa- 
west coast of Nicaragua (Kingsley). Porto Rico: Rio Bayamon, above Palo Seco; Hucares; Ensenada 
Honda, Culebra; San .1 nan (G. M. Gray coll. ) ; Mayaguez (Gundlaeh ). Also taken at Nassau, Bahamas, 
by the Fish Hawk. 
Very abundant on the mangrove roots and a conspicuous object with its dark reddish-brown 
body and almost white palms. 
Genus GRAPSUS Lamarck. 
Grapsus Lamarck, Sys. Anim. sans Vert.., 150, 1801. 
Sides arcuate, with one tooth behind the orbital angle. Front narrow, deflexed. Antennae 
entering the orbit. External maxi Bipeds narrow, widely gaping; merus oblong. Fingers of chelipeds 
excavate. 
Grapsus grapsus (Linnaeus). 
Cancer grapsus Linnaeus, Sys. Nat., 10th ed., i, 630, 1758. 
Cancer ( Grapsus ) grapsus Latreille, Rcgne Anim. Cuvier, nr, 16, 1817. 
Carapace depressed, transversely plicate, folds anteriorly broken up into squamiform tubercles. 
Frontal crest four-lobed, median lobes the larger, their margins subtuberculate. Frontal margin 
crenulate, regularly arcuate. Lateral margin very arcuate. Inferior border of orbit with a deep 
fissure. Inner border of ischium and merus of cheliped spinous, lower margin of merus spino-tuber- 
eulate, outer surface plicate. Carpus with distant tubercles, its inner margin with a laminate spine. 
Hand above tuberculate and with a large distal tooth, externally with longitudinal ridges, below with 
oblique folds. On the inner surface the tubercles and folds are less prominent. Fingers of moderate 
length, tips excavate. Ambulatory feet compressed, last two joints spinose. 
Dimensions of male: Length, 57 mm.; width, 65.5 mm.; width between outer orbital angles, 45.5 
mm.; width of front, 24.5 mm. 
Porto Rico: San Juan; Aguadilla; Boqueron Bay; Guanica Bay; reefs at Ponce; Arroyo; Hucares; 
Caballo Blanco Reef, Vieques; Quebradillas (Gundlaeh). Distributed throughout the Tropics. 
Genus GEOGRAPSUS Stimpson. 
Geograpsus Stimpson, Proc. Acad. Nat. Sci. Phila., x, 101, 1858. 
Carapace depressed, sides curved anteriorly, straight behind, one tooth behind the angle of the 
orbit. Front less than one-half width of carapace, strongly deflexed. Internal suborbital lobe of 
moderate size, reaching the front. Antennae entering the orbit. Outer maxillipeds narrow, merus 
scarcely shorter than ischium. Fingers of-chelipeds acute. 
Geograpsus lividus (Milne Edwards). Land Crab. 
Grapsus lividus Milne Edwards, Hist. Nat. Crust., n, 85, 1837. 
Geograpsus lividus Stimpson, Ann. Lye. Nat. Hist. N. Y., vii, 230, 1860. 
Carapace much broader than long, depressed. Plications nearly transverse. Frontal lobes 
prominent, front deflexed, its margin nearly straight. Sides of carapace slightly arcuate. Orbit with 
a deep fissure below. Merus of chelipeds with transverse rugie above and below, its inner margin 
expanded, proximally denticulate, distally with larger teeth. Carpus granulate, a short spine on the 
inner margin. Hand and dactylus tuberculate above, externally and below with short, oblique rugte; 
fingers acute. Distal angle of literal joints of last pair of ambulatory feet rounded. 
Dimensions of male: Length, 24.8 mm.; width, 30.2 mm.; width between outer orbital angles, 24.5 
mm.; width of front below, 12 mm. 
Florida Keys to Sabanilla, United States of Colombia; Bermudas (Verrill); Lower California to 
Chile; James Island, Galapagos. Porto Rico: Puerto Real; Ponce, on reefs; Hucares; Ensenada Honda, 
Culebra; Vieques (Dr. L. Stejneger, March 28, 1900). 
