230 BULLETIN 201, UNITED STATES NATIONAL MUSEUM 



species to his genus. A comparison of my figures with those of 

 Creaser, however, shows a general broad agreement in essential points 

 between the two species and forces the conclusion that we are dealing 

 with species of the same genus. I have therefore referred my speci- 

 mens to Creaser's genus and have modified his generic definition 

 accordingly. The species described below appears to be distinct from 

 A. cenotensis. The latter is described as having the eyes without pig- 

 ment areas, whereas the new species has a definite narrow band of 

 pigment along the outer edge of the ocular plate. There are also 

 other differences in the telson. 



Emended definition. — Eyes partially fused to form a thick ocular 

 plate with a somewhat deep furrow in the median line separating the 

 distal parts of the two eyes, visual elements imperfectly developed, pig- 

 ment reduced or absent ; antennal scale short, oval, setose, all around, 

 a distal joint marked off by a distinct suture; maxilla with exopod; 

 carpopropodal joint of the endopod of the third to the eighth thoracic 

 limbs divided into two or three sub joints, nail well developed; telson 

 short, quadrangular, apex entire without cleft or emargination, armed 

 with a few strong spines, no plumose setae, lateral margins unarmed 

 or armed with one or two spines ; statocyst very small ; first, second, 

 third, and fifth pleopods of the male rudimentary as in the female, 

 composed of small single-jointed plates ; fourth pleopod of the male 

 biramous, endopod composed of a single- jointed flat plate with a 

 prominent side lobe, exopod three-jointed and terminated by a single 

 very long, strong, barbed seta; female with two pairs of incubatory 

 lamellae. 



Remarks. — This interesting genus is a typical member of the tribe 

 Mysini and in Zimmer's classification falls into his division III.A.a., 

 thus showing closest affinity with the genera Diamysis and Limno- 

 mysis. It differs from both these genera in the form of the telson, 

 which is entire and without cleft or emargination and has a truncate 

 apex. The genera named have the apex of the telson with a shallow 

 apical cleft. Antromysis has become specialized for life in deep holes 

 or in underground cave waters and the eyes are profoundly modified 

 accordingly. 



ANTROMYSIS ANOPHELINAE, new species 



Figures 98, 99 



Description. — Carapace hardly at all produced into a rostral plate, 

 anterior margin broadly arcuate (fig. 98, a). 



Eyes (fig. 98, a) modified and reduced, fused proximally to form an 

 ocular plate, each eye free distally with a deep furrow separating the 

 anterior part of each eye, visual elements reduced and forming a nar- 

 row band along the edge of the ocular plate, where there is also 

 a narrow band of black pigment. 



