THE GRAPSOID CRABS OF AMERICA. 275 



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

 same 13 mm. 



Habitat. Under stones. Scarce. (Jouy.) 



Range. Known 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) (17496) ; para- 

 type in M. C. Z. 



Genus GLYPTOGRAPSUS Smith. 



Glyptograpsus SMITH, Trans. Connecticut Acad. Arts and Sci., vol. 2, 1870, 



p. 153 ; type, G. impressus Smith. 

 Areograpsus BENEDICT, 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, crossed 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 between the 

 email, 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. 



KEY TO THE SPECIES OF THE QENU8 OLYPTOGEAPSDS. 



A 1 . Second and third side teeth slender. Legs nearly naked itnpressus, p. 275. 



A 1 . Second and third side teeth not slender. Legs hairy jamawcnsis, p. 277. 



GLYPTOGRAPSUS IMPRESSUS Smith. 



Plate 72, figs. 1 and 2. 



Glyptograpsus impressus SMITH, Trans. Connecticut Acad. Arts and Sci., 

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



Glyptograpsus spinipes CANO, Boll. Soc. Nat. Napoli, ser. 1, vol. 3, 18S9, 

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



