122 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Glyphidodon Gill, Proc. Acad. Nat. Sci. Phila., 1862, pp. 145, 147. Type 



Chaetodon marginatus Bloch. 

 Chrijsiptera Swainson, Nat. Hist. An., vol. 2, 1839, p. 216. Type Olyphiso- 



don azureus Cuvier = Ghjpliisodon cyaneus Quoy and Gaimabd. desig- 

 nated by Swain, Proc. Acad. Nat. Sci. Pliila., 1882, p. 273. 

 Stegastes Jenyns, Voy. Beayle, Fish., 1842, p. 63. Type Stegastcs inibri- 



catiis Jenyns, monotypic. 

 EuHcJiiHtodus Gdll, Proc. Acad. Nat. Sci. Phila., 1862, p. 145. Type Euchis- 



todus declivifrons Gill, designated by Jordan. Genera of Fishes, vol. 3, 



1919, p. 315. 

 Amhlyglyphidodou Bleekeb, Nat. Verb. Holl. Maatsch. Harlem, (No. 6), 



ser. 3, vol. 2, p. 92. Type Glyphisodon aureus (Kuhl and Van Hasselt) 



Cuvier, orthotypic. 

 Paraghjphidodon Blheker, Nat. Verb. Holl. Maatsch. Harlem, (No. 6), ser. 



3, vol. 2. p. 116. Type Paraglyphidodon oxycephalns Bleeker, designated 



by Jordan, Genera of Fishes, vol. 3, 1919, p. 384. 

 Glyphidodontops Bleeker, Nat. Verb. Holl. Maatsch. Harlem, (No. 6), ser. 



3, vol. 2, p. 128. Type Glyphisodon azureus Cuvier, virtually, as Glyphido- 



dontops proposed to replace Chrysiptera. 

 Centrocliromis Norman, Ann. IMag. Nat. Hist. London, ser. 9, vol. 9, 1922, 



p. 533. Type Glyphidodon rudis Poey, orthotypic. 



Body deep, compressed, orbicular, ovate or ovate-oblong. Jaws 

 equal or subequal. Teeth compressed, fixed, uniserial or irregularly 

 biserial, incisor-like, lobulate or ends conic. Branchiostegals 5 or 6. 

 Pyloric coeca 8. Scales 26 to 30 in median lateral series. Muzzle 

 scaly or naked; infraorbitals and preopercle flange usually naked. 

 Dor«il spines 12 or 13, rays 11 to 18. Anal rays 11 to 17. Caudal 

 with or without filaments. 



Species numerous in tropical seas, often abundant about coral 

 reefs. We retain the smaller and elongated Chnjsiptera Swainson 

 simply as a subgenus. The genus doubtless had its center of dis- 

 persal in the East Indies. Hemiglyphidodon, associated by Bleeker 

 with the present genus, we detach as distinct, due to the greatly 

 increased gill rakers. 



ANALYSI.S OF THE SPECIES 



a\ Orbicular or deeply ovoid ; transverse bands dark, usually more than 2 

 present ; teeth entirely uniserial incisors. 

 6'. Abudefduf. Oblong-oval ; 3 or 4 rows of scales above end of upper section 

 of lateral line ; body always with 5 to 7 dark transverse bands, 

 tr'. Snout scaly, predorsal scales extending forward to nostrils or anterior, 

 d'. Caudal uniformly brown. 



e*. Dark vertical bands 5, wide as pale interspaces saxatilis. 



e". Dark vertical bauds 7, much narrower than pale interspaces, bengalensis. 

 d^ Each caudal lobe with blackish longitudinal band ; dark vertical bands 5, 



wide as pale Interspaces sexfasciatus. 



c". Snout scaleless, preorbital scales not extending forward to front eye edge ; 

 caudal uniform. 

 f. No dark spot at suprascapula or pectoral origin. 



