OXYSTOMATOUS AND ALLIED CRABS OF AMERICA 



93 



spiniform and shorter than middle teeth. Surface of carapace 

 clothed wdth a short pubescence and lightly granulous; branchio- 

 cardiac grooves well marked. Postocular teeth spiniform, projecting 

 far beyond extremity of the small eyestalks. Eyes smaller than the 

 extremity of their peduncles. Chelipeds equal, smooth, naked, 

 unarmed; merus cylindrical, carpus short and rounded; fingers about 

 equal in length to body of chela, compressed, prehensile edges sharp 

 and not provdded with distinct teeth or tubercles. Ambulatory legs 

 nearly naked, second pair more than twice the length of carapace, 



Figure 22. — Ethusina smithiana: a, Dorsal view, enlarged; 6, male abdomen. After Faxou. 



the dactylus longer than propodus. The last two pairs of legs 

 terminate in short recurved claws which are setose on posterior edges. 

 (Faxon.) 



Measurements. — Male type (20631), length of carapace 9.3, breadth 

 8 mm. 



Range. — Pacific side of Costa Rica, Panama, and Colombia. 



Material examined. — As follows: 



OfT Costa Rica: Lat. 5° 36' 40" N., long. 86° 56' 50" W.; 134 

 fathoms; R. Sh.; 54.8° F.; February 28, 1891 ; station 3370, Albatross; 

 3 female paratypes (M. C. Z. no. 4503). 



Off Colombia: Southeast of Malpelo Island; lat. 4°03'00" N., 

 long. 81°3r00" W.; 899 fathoms; R.; 37.2° F.; March 5, 1891; 

 station 3380, Albatross; 1 male, 1 immature female (20631.) 



ETHUSINA FAXONn Rathbun 



Plate 26, Figure 3; Plate 27, Figure 3 



Ethusina challengeri? Faxon, Mem. Mus. Comp. Zool., vol. 18, p. 36, 1895; not 

 Ethusa (Ethusina) challengeri Miers, Voyage of H. M. S. Challenger, Brach- 

 yura, vol. 17, p. 331, pi. 28, fig. 2-2c, 1886. 



Ethusina faxonii Rathbun, Proc. Biol. Soc. Washington, vol. 46, p. 185, 1933 

 (type locality, west of Mexico, 2,232 fathoms; M. C. Z. no. 4502). 



Diagnosis. — Carapace as broad as long. Palm with upper and 

 lower margins subparallel. Fingers shghtly wavy on inner margin. 



Description.- — Carapace very convex longitudinally and trans- 

 versel}^. Frontal teeth shallow, middle pair broad, obtuse, separated 

 by a broad V-shaped sinus, slightly rounded at base; outer pair of 

 teeth small, triangular, shorter than median teeth. Exorbital tooth 



