24 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



Abdomen slightly more than two-thirds as long as carapace; it is 

 bent at fourth somite, which is armed with a small, conical spine 

 projecting from the middle of the dorsal surface. Subhepatic and 

 adjacent pleural regions slightly hairy or pubescent and finely granu- 

 late. (After Smith.) 



Color. — Carapace all over above light orange-rufous, darker toward 

 rostral spines, which are white on margins and tips. Edge of cara- 

 pace all around white as are margins and tips of lateral spines. Legs 

 paler than carapace. The last legs and paddles pinkish vinaceous 

 (looking as if a dash of lavender had been added), as are chelipeds 

 and fingers; a tinge of orange-rufous at articulation near insertion of 

 movable finger on palm ; under parts a sort of bluish or grayish china 

 white. Dactyls of all legs more hke Hlac than pinkish vinaceous. 

 (W. L. Schmitt.) 



Measurements. — Type female, length of carapace 38.4, breadth just 

 back of lateral spines 22, between tips of lateral spines 22.5, breadth 

 of front between tips of spines 6.8, length of rostrum 4, of abdomen 



25 mm. (Smith.) 



Range. — Off Marthas Vineyard, Mass., to Gulf of Mexico and the 

 Greater Antilles; 65 to 260 fathoms. 



Material examined. — See table 5, page 25. 



Genus SYMETHIS Weber 



Symethis Weber, Nomenclator entomologicus, p. 92, 1795 [type, S. variolosa 



(Fabricius)]. 

 Zandifer Henderson, Voyage of H. M. S. Challenger, vol. 27, p. 34, 1888 [type, 



Z. caribensis (de Fremin villa)]. 



Carapace ovate, convex from side to side and from before back- 

 ward, its surface partly uneven. Fronto-orbital border very narrow, 

 considerably less than half the width of carapace, frontal region trilo- 

 bate produced anteriorly. Eyes rudimentary, placed in ill-defined 

 orbits; the peduncles short, and the corneae of small size though pig- 

 mented. Antennal peduncle massive, first segment fused with cara- 

 pace, second with a very prominent external prolongation; flagellum 

 short. Antennules small, completely concealed by the antennal 

 peduncles, which meet in the middle line. Outer maxillipeds moder- 

 ately broad, ischium twice the length of the merus. Sternal thoracic 

 shield narrow, becoming linear between ambulatory legs of first pair, 

 but slightly dilating again between first and second pairs. CheUpeds 

 of considerable length, propodus swollen laterally, fingers long. 

 Ambulatories with uncinate dactyli, last pair of small size but not 

 filiform. Male generative appendages similar to but shorter than 

 those of Raninoides. (Henderson.) East and west coasts of Middle 

 America. 



