536 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



STEGIAS CLIBANARII Richardson. 

 Stegias dibanarii RICHARDSON, Proc. U. S. Nat. Mus., XXVII, 1904, pp. 59-60. 



Locality. Bermudas, on Clibanarius tricolor. 



Head deeply set in thorax, broader posteriorly than anteriorly, 

 longer than broad, and with straight frontal margin. First pair of 

 antennae visible on dorsal surface, just anterior to front, as two small 

 lobes, each antenna terminating in a minute joint. Second pair of 

 antenna? also visible on dorsal surface, lying on either side of first pair 

 of antenna?, each antenna terminating in a flagellum composed of 

 several minute joints. 



Thorax divided into seven distinct segments. The first three sur- 

 round the head, and are closeh 7 crowded together. The other four are 

 very much longer and are of nearly equal length, the fifth being much 



b 

 FIG. 580. STEGIAS CLIBAKABII. a, DORSAL VIEW OF FEMALE. 6, VENTRAL VIEW OF FEMALE, x 8. 



longer at the sides than the others. The first five segments at the 

 sides are directed forward, the five pairs of legs all extending in an 

 anterior direction. A considerable space separates the fifth pair of 

 legs from the sixth pair. The sixth pair of legs, as well as the seventh 

 pair, are placed at the posterior extremity of the sixth and seventh 

 segments, respectively. The epimera of the first four segments are 

 distinct as narrow ridges on the lateral margins of each segment. The 

 ovarian bosses are also present on these segments. 



The abdomen is composed of six distinct segments, the first three 

 of which are provided with a pair of triramous pleopods two dorsal 

 branches and one ventral branch to each pleopod; the next two seg- 

 ments, the fourth and fifth, are each provided with a pair of biramous 

 pleopods, both branches of each pleopod being dorsal, the ventral 

 branch, corresponding to that of the first three segments, not being 

 represented; the sixth segment of the abdomen is furnished with a 



