DECAPOD CRUSTACEANS OF THE WEST INDIES 63 



except that none of the specimens have the last three pereiopods 

 clothed in hair dense enough to conceal the underlying surface. 

 There is considerable variation in the development of the spine at 

 the pterygostomian angle; in most of the larger males, it is longer 

 and more attenuated than in the type from Saint Thomas, but it is 

 far less prominent in small males and females, often being reduced 

 to no more than a broadly acute angle. 



8. Atya scabra (Leach) 

 Figures 9, lOd-f, 14d, e 



Atys scaber Leach, 1815, p, 345 [type-locality: vicinity of Veracruz, Mexico; re- 

 stricted by Holthuis, 1966]. 



Atya mexicana Wiegmann, 1836, p. 145 [type-locality: Misantla, Estado de Veracruz, 

 Mexico]. 



Ataya margaritacea A. Milne-Edwards, 1864, p. 148, pi. 3: fig. 2 [type-locality: 

 "New Caledonia" (probably in error)]. 



Atya punctata Kingsley, 1878b, p. 91 [type-locality: Republic of Haiti]. 



Atya scaftm.— Bouvier, 1925, p. 314, figs. 55-67, 703-706.— Villalobos, 1943, pp. 

 7-67, figs. 1-22.— Holthuis, 1966, p. 234. 



Atyia scabra. — ^\'elez, 1967, p. 42. 



Diagnosis. — Orbital margin unarmed. Rostrum without dorsal teeth, 

 lateral lobes subacute, ventral margin virtually unsLnned.Ventral margins 

 oj pleura of second through jijth abdominal somites armed ivith close-set 

 series oJ stout, blunt spines. Eyes not reduced. Basal segment ofantennular 

 peduncle with one to three spines proximal to series bordering distal margin. 

 Pereiopods \vithout exopods. Fingers of chela of first and second 

 pereiopods bearing terminal tufts of long hair. Carpus of second 

 pereiopod broader than long. Last three pereiopods bearing fiat-topped 

 but upstanding curved spines or tubercles. Merus, carpus, and propodus 

 oJ third pereiopod much more inflated than those oj fourth, merus 

 usually more than 0.3 as broad as long. Appendix masculina on second 

 pleopod of male formmg broad lobe bordered with slender curved spines. 

 Body with dark-colored transverse bands at juncture of carapace and 

 abdomen and on anterior half oj sixth abdominal somite. A moderately 

 large species, maximum postorbital carapace length at least 31 mm. 



Color in life. — Two phases, green and brown. 



Green Phase: Ground color of cephalothorax and abdomen dark 

 green (cliromatophores forming reticulate pattern), darlser dorsally, 

 gradually fading ventrolaterally to olive interspersed with dark 

 cream. Dorsum with broken, narrow, median, longitudinal, greenish- 

 cream stripe extending from anterior part of rostrum to posterior 

 margin of fifth abdominal tergum. (In some larger individuals, dorsal 

 Ught stripe obliterated.) Three dorsally situated transverse bands 

 of dark forest green as foUows: (1) immediately posterior to base of 

 rostrum and extending ventrally almost to level of anteimal spine; 



