240 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Description. Differs very little from G. cruentata of the Atlantic 

 side, but the following characters have been observed : 



The width of the carapace is slightly greater in proportion to the 

 length when specimens of equal size are compared. 



The appendages of the first segment of the male abdomen are 

 straighter, the tip a little more transverse. 



The color is darker, purplish or dark brown predominating; the 

 size of spots and blotches is variable, but they are of a citrine color, 

 becoming yellowish on the legs. 



Measurements. Male (12467), length of carapace 33, width of 

 same 40, width of front 22.5 mm. 



Habits. Like those of G. cruentata. 



A Range. From Magdalena Bay, Lower Cali- 



fornia, to Peru. 

 / \ Material examined. 



[_ j Magdalena Island, Lower California; Dec. 5, 



1905 ; Nelson and Goldman, Biol. Survey, U. S. 

 Dept. Agriculture; 1 male (33416). 

 Lower California (?); 1 male (12467). 

 Guaymas, Mexico; gulf side, beach, under 

 stones, etc.; Feb. 23 and 27, 1891; P. L. Jouy; 

 1 male, 1 female (17294), 1 male y. (17306). 



FIG. 137. GOXIOPSIS JIT ' /~i -n- * -i 



PCLCHUA, ABDOMEN Boca del J esus Maria, Costa Kica; April, 



OB- MALE (12467), i905 ; p. Biolley and J. F. Tristan; 1 male, 1 

 female (32284). 



Santo Domingo, Gulf of Dolce, Costa Rica; April, 1896; H. Pit- 

 tier; 1 male (19436). 



Las Vacas, near Capon, Peru; on beach; Jan. 23, 1908; R. E. 

 Coker; received from Peruvian Government; 3 females (40435). 

 " Chanduya; common on muddy beaches; noted especially about the 

 mangrove swamps." 



Genus PACHYGRAPSUS Randall. 



Pachygrapsus RANDALL, Journ. Acad. Nat. Sci. Philadelphia, vol. 8, 1839 



(3840), p. 127; type, P. crassipes Randall. 

 Goniograpsus (part) DANA, Proc. Acad. Nat. Sci. Philadelphia, vol. 5, 1851 



(1852), pp. 247 and 249. 



Carapace quadrate, broader than long, though sometimes slightly 

 so, a little convex, regions not well defined. Fine oblique lines on 

 the branchial regions, similar transverse lines on the anterior half. 

 Antero-lateral angle acute; there is usually behind it on the lateral 

 margin one or two teeth, but sometimes none. 



Front broad, half or more than half the width of the carapace, 

 deflexed ; along the line of flexion are four lobes more or less promi- 

 nent. 



