SHORE FISHES 'OF GALAPAGOS ISLANDS 387 



Adults that are surely P. flavilatus have, thus far never been re- 

 ported. If P. gilli Gilbert & Starks is not the adult of P. Jlavilatus 

 Gill, it is probably likely that P. rectifrcenum Gill and P. Jlavilatus 

 Gill are the same species, as Giinther concluded. 



There are, therefore, 6 species of Pomacentrus in the Eastern 

 Pacific P. latifrons Tschudi along the coast of South America ; P. 

 rectifrcenum Gill and P. gilli Gilbert & Starks along the coast of 

 Mexico and Central America ; P. leucorus Gilbert at the Revillagigedo, 

 Cocos and Galapagos islands ; P. redemptus Heller and Snodgrass 

 at the Revillagigedo Islands ; and P. arcifrons Heller and Snodgrass 

 at Cocos and the Galapagos Islands. 



104. POMACENTRUS LEUCORUS Gilbert. 



Pomacentrus leucorus GILBERT, Proc. U. S. Nat. Mus. 1891, 554, Socorro 

 Island. 



Rupomacentrus leucorus, JORDAN & McGREGOR, Rep. U. S. Fish Comm. for 

 1898 (1899), 282 (Socorro, Clarion, San Benedicto islands). JORDAN & 

 EVERMANN, Fishes North and Mid. Amer., II, 1551, 1898. 



Range. Revillagigedo, Cocos and Galapagos islands. 



This is the first record of the species from Cocos and the Galapagos 

 Islands. Somewhat rare at the former locality, extremely abundant 

 at the latter, where, together with P. arcifrons, probably outnumbering 

 any other species of the islands. The young are hard to obtain since 

 they live amongst the rocks at the bottom of shallow water and scarcely 

 ever float when killed with dynamite. Their bright colors, however, 

 make them conspicuous objects and, when dead, they can be picked 

 up with a long-handled spear. 



Diagnosis. Easily distinguished from all the other species by the 

 white and orange tip of the pectoral ; forehead evenly retreating from 

 snout to front of dorsal, and preopercle narrow, both as in P. redemptus ; 

 serrations of opercle minute ; lips dark, same color as head ; young 

 without blue mark on scales, posterior half of caudal peduncle pale. 

 Color in life of a typical adult. Above reddish-brown, belly and 

 sides pale dusky ; lips and snout livid grayish ; iris purple, a golden 

 spot above pupil ; opercle with bluish black spot at upper margin ; 

 dorsal and anal like sides, with black tips ; caudal black ; pectoral 

 light brown at base, black beyond, posteriorly white bordered with tip 

 orange, caudal peduncle paler than rest of body ; the white posterior 

 border and orange tip of the pectoral forming a conspicuous mark of 

 the species. The orange tip is not mentioned by Gilbert whose de- 

 scription is from alcoholic material. 



Color in life of a typical young example. Above bright coppery- 



