838 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Family GECARCINIDAt. 
Cardisoma rotundum (Quoy and Gaimard). 
Tlielphusa rotunda Quoy and Gaimard, in Freycinet’s Voyage autour du Monde, III, Zool., p. 527, 
pi. 77, fig. 1 ( Thelphuse chaperon arrondi), 1825. 
Cardisoma hirtipes Dana, Proc. Acad. Nat. Sci. Phila., V, 1851, 253; Crust. U. S. Expl. Exped. 
I, 376, 1852; pi. xxiv, fig. 2, 1855. 
Cardisoma rotundum Safford, Coiitr. U. S. Nat. Herbarium, IX, 1905, 90. 
Oahu, H. Mann, 1864, 1 male, 1 female, in Museum of Comparative Zoology. ' 
Family GRAPSID^E. 
Grapsus grapsus tenuicrustatus (Herbst). 
Cancer tenuicrustatus Herbst, Naturg. Krabben u. Krebse, I, 113, tab. Ill, fig. 33 (not 34), 1783 
(not Gronovius). See von Martens, Arch. f. Naturg., XXXVIII, 1872, 107, and Hilgendorf, 
Monats. K. Akad. Wiss. Berlin, 1878 (1879), 807. 
Grapse rude Milne Edwards, Hist. Nat. Crust., II, 87, 1837. 
Grapsus hirlus Randall, Jour. Phila. Acad. Nat. Sci., VIII, 1839 (1840), 124. 
Grapsus rudis Milne Edwards, Ann. Sci. Nat. (3), Zool., XX, 1853, 168 [134]. 
Cfrapsus maeulatus var. tenuicristatus Kingsley, Proc. Acad. Nat. Sci. Phila., 1880, 193. 
Hilo, Hawaii; Avalu Point, Lanai Island beach, station 3829; Honolulu market; Papai Oama; 
Hanalei, Kauai, reef; Necker Island; Laysan; “under stones, high-water mark,” Henshaw; Kauai, 
A. Garrett, in Museum of Comparative Zoology. 
Hawaiian Islands (Milne Edwards, Gibbes, Randall as G. hirtus; 1 male type, J. K. Townsend, 
collector, in Philadelphia Academy of Natural Sciences; (Danaas G. pictus).® Oahu (Kingsley). Wai- 
kiki, Oahu, and Laysan (Lenz). 
Distribution. — The common rock crab of the tropics, Grapsus grapsus, is separable into two forms, 
one in which the lobe on the wrist is very broad and terminates in a short point ( G . grapsus typical), 
and one in which the same lobe is narrow and terminates in a long narrow spine ( tenuicrustatus Herbst). 
The former inhabits the coasts of America, including the outlying islands, such as the Galapagos, and 
also the eastern shores and islands of the Atlantic Ocean; the latter is restricted to the oriental region. 
This division is borne out by the large series in the U. S. National Museum, containing eight localities 
for tenuicrustatus, exclusive of the Hawaiian Islands, and in the Museum of Comparative Zoology, 
where the same subspecies is represented by nine localities (specimens determined by W. Faxon) . 
Grapsus strigosus (Herbst). & 
Grapsus strigosus Alcock, Jour. Asiat. Soc. Bengal, LXIX, 1900, 393. 
. Mann, 1864, 3 males, 2 females, approaching sub- 
arsis, in Museum of Comparative Zoology, 
i (Cano); Hawaiian Islands (Kingsley). 
Grapsus strigosus longitarsis Dana. 
(PI. VIII, fig. 1.) 
longitarsis Dana, Proc Acad. Nat. Sci. Phila., V, 1851, 
Crust. IT. S. Expl. Exped., Pt. I, 339, 1852; pi. xxi, 
1, 1855. Paumotu Archipelago. 
subquadratus Stimpson, Proc. Acad. Nat. Sci. Phila., 
yv, j.858, 103 [49] . Hawaiian Islands. 
Orthograpsus longitarsis Kingsley, Proc. Acad. Nat. Sci. Phila., 1880, 195. 
a See note under G. strigosus. 
b Dana records G. pictus from the Hawaiian Islands ; his specimens are not extant. A specimen from Paumotu Archi- 
pelago labeled by him “ G. pictus ” is in the National Museum and is really G. strigosus. 
Pig. 4. — Grapsus strigosus longitarsis. a. 
Left chela of female, station 3881, x ljj. 
b, Abdomen of male, Kailua, x IS. 
Oahu, H 
species longit 
Honoluli 
Grapsus \ 
249; 
fig. i 
Grapsus . 
