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



Key to the Bermuda genera of the family Grapsidce* 



A. Antennfe covered by the front. 



B. External maxilliperls withoiit a piliferous ridge. 



C. Antennt¥ excluded from the orbit Goniopsis 



C. Antennae entering the orbit. 

 D. Carapace decidedly broader than long. 

 E. Merus of maxillii^eds longer than broad. 



F. Fingers spoon-shaped at tips Grajjsus 



F'. Fingers acute Geograjjsus 



E'. Merus of maxillipeds as broad as long Pachygrapsus 



D'. Carapace about as long as broad, legs strongly fringed with hairs. .P/anes 

 B'. External maxillipeds with a piliferous ridge. 



C. Lateral margins straight. Carapace transverse, usually 



quadi'ate Sesarma 



C . Lateral margins arcuate and entire Cyclograpsus 



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 (non 



Linne). 

 Grajjsus 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. 

 Goniopais 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 Macrura of Porto Rico, p. 15, pi. i, fig. 2 



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



Rankin, Crust. Berm. I., p. 527. 

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

 Goniojjsis 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, pi. 1, figs. 



6, 7, 1851 (t. Kingsley). 

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



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

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



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



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

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

 witli small, squarish, greenish markings, becoming more numerous 



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

 and Macrura, p. 15, with slight alterations. 



