THE SPIDER CRABS OF AMERICA 



189 



border and one at distal extremity; otherwise the limbs are unarmed; 

 fingers short, gaping slightly at base, cutting edges crenulate, tips 

 blunt. 



Measurements. — Male holotype, extreme length of carapace 35, 

 length from posterior margin to line between anterior margins of 

 preocular teeth 19.2, width of carapace 23 mm. Male (M. C. Z.), 

 length of carapace including rostrum 39, of rostrum 16, width of 

 carapace 28 mm. (Faxon) . 



Range.— Q\i\{ of California to Panama, 14 to 71 fathoms. 



Material examined. — 



Gulf of California; off Cape Tepoca, Mexico; lat. 30° 28' 00" N.; 

 long. 113° 06' 30" W.; 14 fathoms; bk. S. brk. Sh.; temp. 66° F.; 

 Mar. 24, 1889; station 3019, Albatross; 1 male, holotype (17343). 



Gulf of California; northwest of Guaymas, Mexico; lat. 28° 07' 00" 

 N.; long. 111° 39' 45" W.; 71 fathoms; fne. gy. S. brk. Sh.; temp. 

 57.9° F.; Mar. 23, 1889; station 3011, Albatross; 2 males, 1 female 

 (17342). 



Figs. 74-75.— Men aethiops portoricensis. 74 (left), female, holotype, an- 

 terior HALF OF CARAPACE, X 14.5; 75 (RIGHT), FEMALE (56012), BASAL ARTICLE 

 OF LEFT ANTENNA, MUCH ENLARGED 



Genus MENAETHIOPS Alcock 



Memaethiops Alcock, Journ. Asiat. Soc. Bengal, vol. 64, 1895, p. 289; type» 

 M. hicornis Alcock. 



Carapace subpyriform or oblong, pubescent; rostrum divided into 

 two slender spines. The eyes, which are movable forwards but not 

 retractile, are in great part concealed beneath a large, very con- 

 spicuous, laminar, supraocular eave, terminating anteriorl}'^ in a 

 spine. No postorbital spine. Basal article of antenna broad; 

 mobile portions of antennae visible from above, either side of rostrum, 

 Merus of outer maxillipeds as broad as ischium, and palp inserted at 

 antero-internal angle of merus. Chelipeds of male enlarged. The 



