48 



PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



Head twice as wide as long, slightly emarginate in front, with a 

 small median point. Eyes situated at the extreme lateral margin, 

 about the middle. First pair of antenna? have the basal joints greatly 

 dilated, the three following joints slender and not reaching beyond the 

 second peduncular joint of the second pair of antenna?. The second 

 pair of antenna? are extremely short, reaching, when retracted, only 

 to the posterior margin of the first thoracic segment; 

 the first joint of the peduncle is short, the second about 

 twice as long, the last three ecpial in length and not 

 nmch longer than the third joint: the flagellum con- 

 sists of six short joints. Maxilliped with a five- 

 jointed palp. 



The first thoracic segment is deeply excavate, the 

 antero-lateral parts being produced on either side. 

 In the median dorsal line the first segment is half as 

 long as the second. The third and fourth segments 

 are equal in length and are the longest. The last three 

 segments are subequal and are about half as long as 

 the two preceding ones. The epimera of the second, 

 third, and fourth segments extend half the length of 

 the segment, occupjdng only the anterior half of the 

 lateral margin; those of the fifth segment extend two- 

 thirds the length of the segment; the epimera of the 

 last two segments occupy the whole of the lateral margin. 



The abdomen consists of a single segment, very long, equal in 

 length to the last five thoracic segments and with three suture lines 

 on either side, near the base. The sides of the segment gradually 

 converge to a point near the apex, where they form 

 broadl}^ rounded angles and meet some distance below 

 in a long acute point. 



The legs are very small and slender and terminate in 

 bi-unguiculate dactj'li; the two unguli are of equal 

 length, and the character very distinctly marked. 



One specimen, a female, was collected by Jordan and 

 Snyder at Misaki, Sagami, Japan. 

 Tt/pe.— Cat. No. 28963, U.S.N.M. 

 This species differs from Omhysos Spence Bate in hav- 

 ing the head well separated and distinct from the first 

 thoracic segment, while in Spence Bate's genus the head 

 and first thoracic segment are fused and in having the 

 epimera distinct. It differs from the type species C. h>ugic((ndatiis 

 in having the eyes placed in the middle of the lateral margin instead 

 of at the antero-lateral angles; in having the basal joints of the first 

 pair of antenniB dilated; in the much shorter first pair of antennae; 

 in the fewer number of joints in the flagellum of the second pair of 



Fig. 24.— P E N T I .\ s 



HAYI, NEW SPECIES. 



X2. 



Fig. 25.— Maxil- 

 liped OF Pen- 



TIAS HAYI. 



