THE GKAPSOID CRABS OF AMERICA. 



33 



Fig. 9. — Tetrapt.ax qdadui- 

 dentata, male (245u4), 



OUTEtt MAXILLII'EDS, SHOW- 

 ING API'UOXIMATIOX, X 8. 



Diagnosis. — Quadrilateral. Orbits elongate. Meriis of maxilli- 

 peds not broader than long. First segment of male abdomen not 

 covering the sternum ; third segment not reaching the coxae. 



Description. — Carapace thick, convex in both directions, about 

 three-fourths as long as wide, covered with a short, dark-colored 

 pubescence; when this is removed, the re- 

 gions can be made out. Front about one- 

 third width of carapace, deflexed, edge thin, 

 from above appearing slightly emarginate. 

 Superior margin of orbit sloping outward 

 and slightly backAvard to outer orbital 

 tooth; a notch toward inner end, and an- 

 other next outer tooth; inferior margin 

 with a notch next the outer tooth and a 

 tooth at inner angle between which and the 

 angle of the front there is a triangular 

 sinus the inner side of which is formed by the outer margin of the 

 peduncle of the antenna. Antero-lateral margin with 4 teeth, their 

 outer edges finely denticulate; the last three teeth are very nearly 

 in a line parallel to the median line; orbital tooth less projecting. 



Postero-lateral margins longer than an- 

 tero-lateral, and moderately converging. 

 Chelipeds subequal. Merus with a 

 spine on superior margin at distal third. 

 Carpus with an inner spine and an an- 

 terior fringe of hair. Hand smooth and 

 shining, finely granulate above, upper 

 margin acute, very finely granulate and 

 fringed with hair. Lower outer margin 

 of pollex with a granulated costa. Dac- 

 tylus with two superior granulated costae 

 and a superior fringe of hair. First seg- 

 ment of male abdomen narrower than tho 

 third. The sutures between the third and 

 fourth, and fourth and fifth segments are 

 partially indicated. Terminal segment 

 rounded at extremity. 

 Measurements. — Male (24504), length of carapace 8.3, width of 

 same 10.3 mm. 



Range. — Cuba; Porto Eico; Curagao. Four and one-half to 12 

 fathoms. 

 Material examined. — 



Cabanas, Cuba; 2-25 fathoms; S. Sh. Grass to M.; June 8-9, 1914; 

 Henderson and Bartsch, Tomas Barrera Exped.; 1 female (491G5). 

 65S63— 17 3 



Fig. 10. — Tethaplax QUAnni- 



DEXTATA, MALE (24504), AB- 

 DOMEN, PAUT OV .STEUXDM, AND 

 COXA OF LAST LEG, X 0§. 



