THE CANCROID CRABS OF AMERICA 399 



HEXAPANOPEUS CARIBBAEUS (Stimpson) 



Plate 171, Figures 3-5 



Micropanope caribbaea Stimpson, Ann. Lye. Nat. Hist. N. Y., vol. 10, 1871, p. 



108 (type-locality, St. Thomas; type not extant). 

 Eurypanopeus caribbaeus Rathbun, Ann. Inst. Jamaica, vol. 1, 1897, p. 20. 

 Hexapanopeus caribbaeus Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, vol. 



4, 1898, p. 273; Bull. U. S. Fish Comm. for 1900, vol. 20, part 2, 1901, p. 31. 



Diagnosis. — Fifth lateral tooth minute. A supra-orbital lobe 

 present, advanced to level of outer orbital tooth. Dark color of 

 fingers running backward and upward on palm. No large tooth at 

 base of major dactyl. 



Description. — Carapace moderately convex, pubescent. Trans- 

 verse ridges with longer hairs, as follows: Two subparallel, on proto- 

 gastric region; one epibranchial, strong, in line with last lateral tooth; 

 slightly further back, one metagastric, interrupted at middle; one 

 cardiac, with a shorter median break; one short, above base of last 

 leg. An oblique and more feeble granulate hepatic ridge paralleling 

 the lateral margin; this ridge is lacking in small specimens. Front 

 very narrow, produced, edge thin, lateral margins oblique, a median 

 V, lobes oblique, or in the young transverse or nearly so. Antennal 

 flagellum as long as front is broad. Inner supra-orbital border 

 elevated, emarginations V-shaped, intervening space lobate or 

 obtusangled, as advanced as the small triangular, outer tooth. 

 Exorbital notch V-shaped, lower margin advanced, becoming grad- 

 ually more so up to the broad inner tooth, which is less produced 

 than the corresponding tooth above. Second antero-lateral tooth 

 small, similar to first and separated from it by a shallow sinus ; their 

 combined width equal to that of third tooth, which has a transverse 

 or in the old strongly concave, anterior, and an arcuate posterior 

 margin, tip acute. Fourth tooth spiniform, a little narrower at base 

 than third, and much more outstanding, directed obliquely forward, 

 anterior margin concave, posterior straight or nearly so. Fifth tooth 

 minute, separated from fourth by a closed fissure and appearing 

 much like a section from the posterior slope of the fourth. 



Chelipeds very unequal; carpus with a number of small tubercules, 

 arranged roughly in three rows, and at the inner angle a small slender 

 tooth. Palm very finely granulate but smooth to the naked eye; 

 two parallel ridges above and a smooth interspace. Fingers dark 

 with light tips, the dark of the propodal finger prolonged in the male 

 well back and up on the palm, in the female and young a short way 

 back. Major fingers stout, not gaping, minor fingers slenderer and 

 longer; major dactylus without large basal tooth; major fixed finger 

 nearly horizontal, minor deflexed. Ambulatory legs very slender, 

 merus not inflated. 



