314 A. E. Verrill — Decapod Crustacea of Bermuda. 



Key to the Bermuda genera of the family Grapsidce.* 



A. Antennae covered by the front. 



B. External maxillipeds without a piliferous ridge. 



C Antennae excluded from the orbit Goniopsis 



C. Antennae entering the orbit. 



D. Carapace decidedly broader than long. 

 E. Merus of maxillipeds longer than broad. 



F. Fingers spoon-shaped at tips Grapsus 



F'. Fingers acute Geograpsus 



E'. Merus of maxillipeds as broad as long Pachygrapsus 



D'. Carapace about as long as broad, legs sti'ongly fringed with hairs. _P/anes 

 B'. External maxillipeds with a piliferous ridge. 



C. Lateral margins straight. Carapace transverse, usually 



quadrate . Sesarma 



C. Lateral margins arcuate and entire C'yclograpsus 



A'. Antennae visible from above ; two deep frontal notches. 



B. Merus of maxillipeds large, as broad as ischium Plagusia 



B'. Merus of maxillipeds small, much narrower than ischium Percnon 



Goniopsis cruentatus (Latr.) DeHaan. Mangrove Crab. 



Cancer ruricola DeGeer, Memoires, Insectes, vii, p. 417, pi. xxv, 1778 {nan 



Linne). 

 Grapsus cruentatus Latreille, Histoire Crust, et Insects, vi, p. 70, 1803. Des- 



marest, Consid., p. 132. M. -Edwards, Hist. nat. des Crust., ii, p. 85. 



Gibbes, op. cit., p. 181. 

 Goniopsis cruentatus DeHaan, F. Jap., p. 33, 1835; M.-Edw., Ann. Sciences 



nat. 3, XX, p. 164. pi. 7, fig. 2, 1853. Stimpson, Proc. Acad. Nat. Sci., 



Philad., 1858, p. 101. Smith, Crust. Brazil, these Trans., ii, p. 11, 1869 



(syn., no descr.). Miers, Voy. Challenger, xvii, p. 267. (Bermuda.) 

 M. J. Rathbun, Brachyura and Macinira of Porto Rico, p. 15, pi. i, fig. 2 



(colored), 1901. Verrill, The Bermuda Is., vol. i, p. 547, fig. 250, 1903. 



Rankin, Crust. Bei'm. I., p. 527. 

 Grapsus longipes Randall, Journal Acad. Nat. Sci., Philad., viii, p. 125, 1839. 

 Goniopsis ruricola White, List of Crust, in the British Museum, p. 40, 1847. 



Saussure, op. cit., p. 30, pi. 2, fig. 18, 1858. 

 Grapsus pelli Herklots, Addit. Faunam Carcin., Afr. Occid., 8, i>\. 1, figs. 



6, 7, 1851 (t. Kingsley). 

 Goniograjisus cruentatus Dann, Amer. Jour. Sci. (2), xii, p. 285, 1851 ; U. S. 



Expl. Exped., Crust., p. 342, pi. 21, fig. 7, 1852. 

 Goniograpsus cruentatus Kingsley, Synopsis Grapsidae, Proc. Acad. Nat. Sci. 



Philad., 1880, p. 190 (sjni. and descr.). Young, op. cit., p. 278, 1900. 



Figure 4. Plate XI, Figure 1. Plate XII, Figure 4a. 

 In life a large female had the carapace veiy dark brown or black, 

 with small, squarish, greenish markings, becoming more numerous 



* This Key is taken from that of Miss M. J. Rathbun, Porto Rico Brachyura 

 and Maerura, p. 15, with slight alterations. 



