1492 Bulletin tf, United States National Museum. 



with light blue ; these "bands and spots singularly arranged ; 2 of these 

 hands on the head, crossing preopercle ; 2 others on preorbital ; 5 on body 

 and caudal peduncle, composed of large, more or less confluent, roundish 

 spots, the 2 below the spinous portion of the dorsal terminating above in 

 a pair of large spots; caudal with similar ocellated spots, the pale color 

 appearing as reticulations around them; 2 large ocelli on anal; a brown 

 band across the inner side of base of pectoral. Length 14 inches. Cape 

 San Lucas to the Galapagos Islands; not rare about rocky islands; an in- 

 teresting and curiously colored fish. Here described from specimens from 

 the Revillagigedos ; the young unknown, unless C. betauriis should be the 

 young as has been supposed, (rivulatus, marked by rill-like streaks.) 



Cirrhites rivulatu*, VALENCIENNES, Voyage Venus, Poiss., 309, pi. 3, fig. 1, 1855, Galapagos 



Islands. 

 Cirrhitichthys rivulalus, GUNTHER, Fish Centr. Am., 421, pi. 86, fig. 4, 1868. 



1878. CIRRHITES BETAURUS, Gill. 



Head 2f ; depth 3. D. X, 11; A. Ill, 5. Preoperculum serrated behind. 

 Eye (in young) 3| in head, equal to snout. Fourth dorsal spine longest 

 and equals of the total length; second anal spine largest, equaling the 

 fourth dorsal one; longest soft ray 6f in total length; caudal fin slightly 

 emarginate and nearly of the length; produced pectoral ray rather ex- 

 ceeding of the length, and the ventral fin enters 5 times in the same. 

 Color pale yellowish on the body, blackish on the shoulders and from 

 the dorsal fin to the eyes, and with 4 complete, oblique, blackish bands; 

 the first under the middle of the spinous dorsal, the second under the last 

 spine, the third under the middle of the softMorsal, and the fourth encir- 

 cling the caudal peduncle; head with 3 lateral bands, 1 on the preorbital 

 region, a second on the cheek, and third on the posterior margin of the 

 preoperculum ; operculum with a longitudinal oblong spot; chin with 4 

 spots forming the angles of a rhomb, and there is another one behind, on 

 the branchiostegal membrane near the margin ; spinous dorsal margined 

 with blackish, and the 2 bands beneath more or less ascend on it; anal 

 blackish ; caudal with a blackish B-shaped mark and a band at its base 

 divided by the lateral line; pectoral dusky, with a black spot at its base 

 nearly surrounded by a clear area, and separated from a spot in front of 

 the base; ventrals blackish, with nearly transparent sides and margin. 

 Rock pools between tide marks about Cape San Lucas and Mazatlan; 

 abundant; a very active and strikingly colored little fish. The largest 

 specimens known are 2| inches long. The adult is unknown unless 

 Cirrkites rii'ulatus should prove to be such. There is no important differ- 

 ence in form or structure, but the coloration of the two is very different, 

 and suggests that the two are distinct species. (/??/rcr, the letter B ; ovpd, 

 tail.) 



Cirrhites betarus, GILL, Proc. Ac. Nat. Sci. Phila. 1862, 259, Cape San Lucas (Coll. John 

 Xanlus) ; young, of 1 inches. 



