DESCRIPTIOX OF A ^EW GENUS AND FOUR NEW 

 SPECIES OF CEABS FROM THE WEST INDIES. 



By Mary J. Rathbfn, 



Second Assistaal Curator, Dejjartment of Marine Tnrertebrates. 



The species here described are represented in the collection of Mr. 

 P. W. Jarvis, Kingston, Jamaica, and the descriptions will be reprinted 

 in a list of Jamaica crabs shortly to be i)iiblished in the Jonrnal of the 

 Institnte of Jamaica. The types are in the United States National 

 Mnsenm. 



EUCINETOPS BLAKIANA, new species. 



Closely allied to E. hicasii, Stimpson, from the Pacific Coast. Cara- 

 pace oblong, anterolateral margins slightly converging anteriorly, 

 nearly straight; postero-lateral margins more oblique than in U. lucdsii. 



Surface uneven; median regions elevated, hepatic region depressed, 

 separated from the branchial by a deep hollow and a marginal sinus. 

 Antero-lateral margin tnberculate, a spine at the postero lateral angle; 

 a few additional tubercles on the upper surface of the branchial region. 



Front depressed; rostrum shorter tlian in U. Jiu-asii, formed by two 

 rounded lobes, each tipped with a small sharp spine,' and separated by 

 a V-shaped sinus. Antero-lateral tooth longer than broad, acute, 

 upturned, separated from the or])it by a narrow rounded sinus. 

 Eye-stalks iilling the orbit, tapering to near the cornea; tip slightly 

 enlarged. Abdomen conjposed of 7 segments in both sexes; in the 

 male, constricted at the fifth segment, sixth segment with convex lat- 

 eral outlines; seventh rounded, broader than long. Antero-exteriial 

 lobe of the first movable joint of the antenna?- moderately developed, 

 not reaching the end of tlie rostrum. 



Chelipeds small, smooth, and shining; merus subtrigonal; carpus 

 with a tubercle above, near the merus; hands compressed, margins 

 converging toward the lingers. Ambulatory legs subcylindrical; dac- 

 tyli very slender and much curved. Both cara])ace and ambulatory 

 legs are clothed with hair, and when collected were concealed by bryo- 

 zoans, grains of sand, and other foreign substances. 



Length of female, 6,4 mni.; width, 4.6. Length of male, 4.5 mm.; 

 width, 3.3. 



Proceedings U. S. National Museum, Vol. XIX— No. 1104. 



141 



