1918.] 



NATURAL SCIENCES OF PHILADELPHIA. 



59 



This subgenus appears unique in its very fine and numerous 

 gill-rakers. 



(h'rsc?, comb; Glyphidodon, an old name for Ahudefduf; with refer- 

 ence to the fine gill-rakers.) 



Abudefduf melanopselion sp. nov. Fig. 23. 



Head 3; depth 2|; D. XIII, 14, i; A. II, 15, i; P. ii, 13; V. I, 5; 

 tubes in upper arch of lateral line 16, followed by 3 pores as one on 

 each scale sloping down behind, then 5 pores in straight section on 

 side of caudal peduncle; 5 scales in vertical series between 1.1. and 



Fig. 23. — Abudefduf melanopselion sp. nov. 



spinous dorsal origin, and 10 below in vertical series to spinous anal 

 origin; 21 predorsal scales; head width 1| its length; head depth 1; 

 snout 2|; eye 3f ; maxillary 3f ; interorbital 2f ; last dorsal spine If; 

 seventh dorsal ray 1|; least depth of caudal peduncle 2|; second anal 

 spine 2; seventh anal ray If; caudal 1|; pectoral 1|; ventral 1|. 



Body well compressed, rather deep, and greatest depth median, 

 edges rounded or predorsal scarcely trenchant. Caudal peduncle 

 compressed, least depth twice its length. 



Head moderately large, well compressed, evenly constricted above 

 and below, upper profile little more inclined. Snout nearl}^ straight 



