220 



U.S. NATIONAL MUSEUM BULLETIN 292 



subcyliiidrical in midline, surface microscopically granular, appearing 

 smooth, without pubescence dorsaWj ; fronto-orbital distance not more 

 than two-thirds of maximum carapace width in adult males; front 

 widening toward base, not subspatulate, width between posterodistal 

 angles of basal segments of eyestalks, with eyes retracted, about 

 two-fifths of fron to-orbital distance; lateral marginal ridges regularly 

 curved, converging posteriorly. Cornea slightly swollen, occupying 

 slightly less than half of extensor surface of eyestalk. Chelipeds 

 usually somewhat dissimilar and distinctly unequal in both sexes 

 (atypically subequal in figured specimen) ; fingers of major chela 

 slightly longer than palm, spinose on extensor margin. Second, third, 



Figure 75. — Ucides cordatus, male (carapace length 46.2 mm) from Dominica station 112. 



and fourth pereiopods of males bearing very long silky hairs, especially 

 numerous on flexor margins of carpus and propodus and on extensor 

 margins of carpus and propodus of third and fourth pereiopods; 

 walking legs of females without conspicuous hairs. Fringe of hairs on 

 opposable surfaces of coxae of third and fourth pereiopods reduced, no 

 more prominent than hauiness between coxae of second and third 

 pereiopods. Denuded first pleopod of male terminating, in posterior 

 view, in somewhat truncate tip inclined slightly mesially, with narrow 

 chitinous process on lateral surface proximal to tip (fig. 76a). A large 

 species, maximum carapace length in midline about 70 mm. 



Color in life. — Carapace mostly grayish blue with posterolateral 

 portions of branchial region white; fronto-orbital region margined 

 with dark orange; anterior projection of mesogastric region with 

 single purple spot and pair of them in lateral protogastric regions; 



