REVIEW OF THE PARROTFISHES 23 



of bright orange-yellow, then a broad blue one followed by irregular 

 markings, not distinct, of dull orange-yellow. Dorsal fin blue for- 

 ward with an increasing amount of orange-brown on membranes, 

 until fin becomes brown with a definite narrow blue border. Caudal 

 deep blue with a narrow, irregular brownish border. Anal blue, 

 becommg brownish medially. Pectoral blue above, somewhat brown 

 below." 



I have studied 3 specimens (USNM 55499 to 55501) from the 

 Hawaiian Islands and 3 from the Eastern Pacific, as follows: USNM 

 163664, Chatham Bay, Cocos Island, Dec. 26, 1952, collected by 

 Bruce W. Halstead and N. C. Bunker, standard length 275 mm., 

 viscera missing, sex not determined; USNM 163663, Mexico, Guerrero, 

 north side of Roqueto Island, Acapulco, collector C. L. Hubbs, Zaca 

 Expedition, Sept. 3, 1946, standard length 460 mm., most of viscera 

 missing, sex not determined; and a specimen loaned by the Univ. 

 Calif, at Los Angeles, from Mexico, Revillagigedo Islands, Socorro 

 Island, Binner's Cove, May 5, 1955, Richard Rosenblatt, standard 

 length 465 mm., mature male. 



Xenoscarops, new subgenus 



Genotype: Scarus perrico Jordan and Gilbert 



This new subgenus is intermediate between Scarus and Scarops. 

 In Scarus perrico each upper pharyngeal bone in large adults have a 

 single main row, but small specimens, 210 mm. in standard length 

 and shorter, have 2 or 3 small rudimentary teeth representing the 

 outer row; this outer rudimentary row apparently disappears, for in 

 large adults there is no trace of it. This species may represent the 

 evolutionary link between Scarus and Scarops. It could be considered, 

 perhaps a subgenus under Scarus almost as well as under Scarops. 



From Scarops, which has 3 rows of scales on the cheek, this new 

 subgenus may be distinguished by having only 2 rows of scales on the 

 cheek. 



Scarops perrico (Jordan and Gilbert) 



Figure 3; Plate 2,a,b 



Scarus perrico Jordan and Gilbert, Proc. U. S. Nat. Mus., vol. 4, p. 357, 1881 



(type locality: MazatMn; holotype USNM 28328). 

 Callyodon microps Osburn and Nichols, Bull. Amer. Mus. Nat. Hist., vol. 35, 



art. 16, p. 170, fig. 12, 1916 (type locality: Santa Catalina Island, Gulf of 



California, holotype USNM 87548). 

 Scarus dubius (not of Bennett) Hildebrand, U. S. Nat. Mus. BuU. 189, p. 351, 



fig. 72, 1946 (type locality: Lobos de Afuera Bay, Peru; holotype USNM 



128113; paratypes USNM 128114 and 128115). 

 Scarus hildebrandi Kanazawa, Copeia, No. 3, p. 203, 1952 (new name to replace 



Scarus dubius Hildebrand, preoccupied by Scarus dvbius Bennett). 



