LITIANIDAE. 113 



One specimen, No. 3311, 12? inches long from Rikitea, Manga Reva. 



Head including flap 2. (18 in length; depth 2.52; eye 4.85 in head; snout 

 2.86; maxillary 2.48; pectoral not reaching front of anal, l.Ki in head; deep 

 opercular notch, with opercular knob moderate. 



Rabirubia inermis (Peters). 



Jordan, Proc. Cal. Acad. Sci., 1895, ser. 2, 5, p. 457, pi. 39. 



Mesoprion inermis Peters, Monatsb. K. Akad. Wiss. Berlin, 1869, p. 705. 



Twenty-seven specimens, 2x5 to 55 inches long from Acapulco, shore. 

 M. C. Z. 29444 (10 specimens). 



These specimens show a dusky spot on upper base of pectoral; the upper 

 and lower caudal raj^ pale, the lower paler, almost white; other outer rays of 

 caudal with dusky area, wide at base, tapering to the tips of the lobes; a yellow- 

 ish band at base of caudal; these colors are most distinct in the smallest speci- 

 mens, gradually becoming less distinct in the largest specimens; on each of the 

 specimens there is an oblong faint bluish, iridescent, or pearly spot, in most 

 specimens extending from posterior angle of soft dorsal downward and forward 

 to lateral line, in others lying parallel with and close to the lateral line; some 

 specimens have a small spot of similar color on the top of caudal peduncle. 



Xenocys jessiae Jordan & Bollman. 

 Proc. U. S. Nat. Mus., 1890, 12, p. 160. Snodgr.a..ss & Heller, Proc. Wash. Acad. Sci., 1905, 6, p. 375. 



Five specimens. No. 3249-50, 3264-5, M. C. Z. 29639 and 3278, M. C. Z. 

 29711, 6i to 92 inches long from Wreck Bay, Chatham Island. 



Xenichthys santi Gill. 

 Proc. Acad. Nat. Sci. Phil., 1863, p. 82. Gilbert & Starks, Mem. Cal. Acad. Sci., 1904, 4, p. 103. 



Four specimens 51 to 6g inches long from Perico Island, Panama Bay, in 

 two fathoms of water. M. C. Z. 29421 (2 specimens). 



This species is easily distinguished from X. agassizii by having a much 

 shorter pectoral, and in our specimens, by the presence of very distinct lateral 

 stripes, large black spot at base of caudal and in having the ventrals dusky only 

 at tip. Xenichthys agassizii has a broad black outer margin to the ventrals. 



Xenichthys agassizii Steindachner. 



Sitzb. Ak. Wiss. Wien, 1875, 72, p. 34. (Beitrage, 3, p. 6.) Snodgrass& Heller, Proc. Wash. Acad. 

 Sci., 1905, 6, p. 376. 



Five specimens, Nos. 3266-70, 65 to 8 inches long, and one specimen (with- 

 out tin tag) 4| inches long from Wreck Bay, Chatham Island. Nos. 3269-70, 

 M. C. Z. 29644, 29647 (2 specimens). 



