THE GRAPSOID CEABS OF AMERICA. 179 



rounded. Fingers shorter than palm, shutting together. Legs slen- 

 der, propodus several times longer than wide; dactyli tolerably 

 straight, except those of the third pair which are shorter and some- 

 what curved, and those of fourth pair w T hich are longer and entirely 

 straight. Abdomen very wide, covering the whole sternum. 



Locality. Brazil (2 females in Strassburg Mus.). 



Remarks. I think that this species is very likely a Pinnotheres. 



Genus TETRIAS Rathbun. 



Tetrias RATHBUN, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 607; type, T. 

 seabripes Rathburn. ALCOCK, Journ. Asiat. Soe. Bengal, vol. 69, 1900, 

 p. 335. 



Carapace transversely oblong, hard, regions indicated, posterior 

 two-thirds flattened, anterior third deflexed; antero-lateral angles 

 rounded, sides steep. Ischium well developed, distinct from merus, 

 palpus very large, joints end to end, the last two joints widening 

 distally, last joint attached near inner end of distal margin of pre- 

 ceding. Chelipeds stout. Legs diminishing, from second to fourth, 

 which is very small; first and third subequal. Abdomen of female 

 suborbictilar, at base only half width of sternum, tip overlapping 

 buccal cavity. 



Inhabits the Indo-Pacific and Gulf of California. 



TETRIAS SCABRIPES Rathbun. 



Plate 39, figs. 4 and 5. 



Tetrias seabripes RATHBUN, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 608, 

 pi. 43, figs. 12-14 (type-locality, Gulf of California, 9i fathoms; holo- 

 type female. Cat. No. 21595, U.S.N.M.). 



Diagnosis. Carapace transverse, oblong, uneven, hard. Palpus 

 of maxilliped very large, segments end to end. Chelipeds and 

 bases of legs spinulous. Second leg longest, fourth very small; 

 dactyli curved. 



Description of female. Carapace covered with a short, dense coat- 

 ing of coarse, dark setae, beneath w r hich the surface is punctate; 

 regions indicated by impressed lines and pits, the deepest between 

 cardiac and gastric regions; a tubercle on outer margin of hepatic 

 region. Front projecting very slightly beyond anterior margin of 

 carapace and bent doAvn to form roof of antennular cavities, as in 

 Pinnixa. 



Maxillipeds bearded with long silken hairs, most noticeable on 

 margins of last two palpar joints and in a transverse line on merus. 



Outer surface of merus of chelipeds triangular, as wide as long; 

 upper and lower margins rough with small spines or spinules ; inner 

 angles of carpus rectangular, each armed with two or three short 



