THE SPIDER CRABS OF AMERICA 



377 



sides perpendicular. Orbit with a short preocular and postocular 

 spine and an inferior tubercle on margin of antenna! joint. Rostral 

 horns about half as long as rest of carapace, slender, tapering, granu- 

 late, slightly convex to each other, leaving a narrow interspace at 

 base and toward extremity, otherwise contiguous. Basal antennal 

 joint with two short distal spines — one at insertion of second joint, 

 the other terminating a longitudinal ridge and 

 just visible beside rostrum in a dorsal view; 

 flagellum filiform. Chelipeds tuberculate ; palm 

 slightly compressed, about two and one-half 

 times as long as wide in adult male; fingers 

 gaping in male, the dactylus with a broad 

 basal tooth. Ambulatory legs pubescent. 



Measurements. — Male (47065), entire length 

 of carapace 22. C, length of rostral horns 7.2, 

 branchial width inclusive of spines 9.7, ex- 

 clusive of spines 9.3, width between tips of pre- 

 ocular spines 6.3 mm. 



Range. — Florida Keys, from Miami south- 

 ward; West Indies; northern Brazil. Depth, 

 1 to 40 fathoms. 



Material examined. — See table, page 376. 



Fig. 120.— Leptopisa setirostris 



(48658), MAXILLIPED, X 9.16 



Genus ANAPTYCHUS Stimpson 



Anaptychus Stimpson, Ann. Lye. Nat. Hist. Nev/ York, vol. 7, 1860, p. 



183 [55]; type, A. cornutus Stimpson. 

 Ala LocKiNGTON, Proc. California Acad. Sci., vol. 7, 1876 (1877), p. 65 [3]; 



tj'pe, A. spinosa Lockington. 



Carapace triangular, broader than long: lat- 

 eral and antero-lateral margins laminiform, 

 expanded above the bases of the leg^ and 

 coarsely dentate; sides below the laminae 

 perpendicular. Orbits complete, small and 

 deep, but not tubular. Eyes retractile, cap- 

 able of concealment. Rostrum and external 

 antennae resembling those of Microphrys. 

 Rostrum short, bifid. Spine of basal article of 



Fig 121.— Leptopisa setiros- i. i j i . i ti .i 



TRis. FEMALE (48667), BASAL extcmal autcnnae long, acute, much like the 

 article of antenna with rostral horn; movable part exposed. Preor- 



POSTORBITAL LOBE, X 9 l.*i1 • • j. j. j. r'/l 



Dital spme promment, acute; outer orbital 

 angle dentiform, minute; superior orbital fissures closed, inconspic- 

 uous. Merus of endognath of external maxillipeds broader than 

 long, external angle abruptly prominent, inner angle sinuous at the 

 insertion of the palp; exognath wide, armed on the inner side with a 

 strong, exposed tooth. 



