THE GRAPSOID CKABS OF AMERICA. 275 



Measurements. — Male, holotype, length of carapace 10.4, width of 

 same 13 mm. 



Habitat. — Under stones. Scarce. (Jouy.) 



Range. — KnoAvn only from the type-locality. 



Material examined. — Guaymas, Mexico, Gulf side; Feb. 27, 1891; 

 P. L. Jouy; 6 males, 5 females (1 male is holotype) (17490) ; para- 

 type in M. C. Z. 



Genus GLYPTOGRAPSUS Smith. 



Glyptograpsus Smith, Trans. Connecticut Acad. Arts and Sci., vol. 2, 187(>, 



p. 153; type, G. impressus Smith. 

 Areograpsus Bknedict, Johns Hopkins Univ. Circ, vol. 11, No. 97, 1892, 



p. 77; type, A. jamaicensis Benedict. 



Carapace thick, much broader than long and broader behind than 

 in front ; dorsal surface • distinctly areolated. Lateral margins 

 strongly arcuate, quadridentate anteriorly. Front arched above the 

 antennae and antennulae, but excavated and deflexed in the middle. 



Epistome high and nearly perpendicular, crojssed transversely by 

 a sharp groove. Labial border straight as seen in a front view, 

 broken by a distinct notch in the middle, as seen from below. At the 

 sides of the epistome, in the antero-lateral angle of the buccal area, 

 there is a deep and narrow notch, which serves as an efferent orifice. 

 Palate without longitudinal ridges. 



Basis of antenna movable, filling the whole space betv/een the 

 small, triangular, inner, suborbital lobe and the front; remainder of 

 antenna within the orbit. 



Outer maxillipeds with their inner margins almost meeting; 

 ischium and merus of nearly equal length; both very broad, the 

 merus broader than long, its antero-lateral angle not expanded ; palp 

 articulated near that angle. 



Legs rather long; dactyli quadrangular, their angles armed with 

 spines. 



Abdomen of male with seven distinct segments. 



Two analogous species only, inhabiting opposite sides of tropical 

 America: jamaicensis (Atlantic); impressus (Pacific). Fluviatil«^ 

 in part, at least. 



KEjr TO THE SPECIES OF THE GEN'US GLYPTOGEAPSUS. 



A\ Second and third side teeth slender. Legs nearly naked impressus, p. 275. 



A*. Second and tliird side teeth not slender. Legs hairy jawniccnsis, p. 277. 



GLYPTOGRAPSUS IMPRESSUS Smith. 



Plate 72, figs. 1 and 2. 



Glyptograpsus impressus Smith, Trans. Connecticut Acad. Arts and Scl., 



vol. 2, 1870, p. 154 (type-locality, Acm jutia ; holotype in P. M. Y. U.). 



Glyptograpsus spinipcs Gang, Boll. Soc. Nat. Napoli, spr. 1, vol. 3, 18S9, 



pp. 102 and 241 (type-locality, Isola dello Perle; type in Naples Mus.). 



