244 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



PACHYGRAPSUS MAURUS (Lucas). 



Plate 60, figs. 1 and 2. 



Grapsus maurus LTJCAS, Explor. Sci. AlgSrie, Zool., Insectes, vol. 1, 1846, 

 p. 20, and vol. 4, (atlas), pi. 2, fig. 5 (type-locality, Oran ; type in 

 i Paris Mus.). 



Goniograpsus simplex DANA, Proc. Acad. Nat. Sci. Philadelphia, vol. 5, 



1851 (1852), p. 249 (type-locality, Rio Janeiro?; type not extant); 



U. S. Expl. Exped., vol. 13, Crust., pt. 1, 1852, p. 344 ; atlas, 1855, pi. 21, 



fig. 8. 



Leptograpsus maurus MILNE EDWABDS, Ann. Sci. Nat., ser. 3, Zool., vol. 20, 



1853, p. 173 [139]. 

 Pachygrapsus simplex STIMPSON, Proc. Acad. Nat. Sci. Philadelphia, vol. 10, 



1858, p. 102 [48], 

 Pachygrapsus maurus KINGSLEY, Proc. Acad. Nat. Sci. Philadelphia, 1880, 



p. 199. 



Diagnosis. One side tooth. Striae mostly short. Merus of last 

 leg entire behind. 



Description. A small species. Carapace narrower than in P. cras- 

 sipes or P. transversus, with which this species has been confused ; 

 sides less convergent behind, also less arched .anteriorly than in P. 

 crassipes; striae fine and much broken up, but present except on the 

 intestinal region. 



Edge of front bilobed, its surface granulate; superior lobes little 

 prominent. 



Tooth of wrist acute. 



Distal angle of posterior border of merus of last pair of legs en- 

 tire ; of the first three pairs, dentate or denticulate. 



Color. Dark brown, with isolated yellow spots; similar spots at 

 the ends of the several joints of the legs. 



Measurements. Mature female (18627), length of carapace 6.4, 

 width of same 7.3 mm. Male (Lucas), length of carapace 17, width 

 of same 19.5 mm. 



Range. Rio Janeiro (Dana, Heller) ; also East Atlantic and Medi- 

 terranean; Madeira (Stimpson) ; Terceira, Azores (Rathbun) ; 

 Algiers (Lucas); Oran (M. Edwards). 



Material examined. Terceira, Azores; William Trelease; 1 female 

 (18627). Guia Island, Grand Canaries; September, 1894; 3 males, 1 

 female ovig., 4 y., with Serpula attached (44529). 



PACHYGRAPSUS TRANSVERSUS (Gibbes). 



Plate 61, figs. 2 and 3. 



Grapsus transversus GIBBES, Proc. Amer. Assoc. Adv. Sci., vol. 3, 1850, p. 



181 (type-locality, Key West; type not extant). 

 Pachygrapsus transversus GIBBES, Proc. Amer. Assoc. Adv. Sci., vol. 3, 1850, 



p. 182. 

 Goniograpsus innotatus DANA, Proc. Acad. Nat. Sci. Philadelphia, vol. 5, 



1851 (1852), p. 249 (type-locality, ad oras Americae Australis f; type, 



Cat. No. 2329, U.S.N.M.) ; U. S. Expl. Exped., vol. 13, Crust., pt. 1, 



1852, p. 345 ; atlas, 1855, pi. 21, fig. 9 a-c. 



