FISHES OP THE PHILIPPINE AND ADJACENT SEAS 67 



c\ DiscHiSTODus. Snout scaleless. 



p\ Lower preopercle limb and interorbital 

 .scaly; preopercle edge strongly dentate. 

 (/\ Outer mandibular teeth more or less 

 truncate. 

 1^. Interorbital scales not extending for- 

 ward to nostrils ; second anal spine 

 less tban postocular region. 

 &-\ Round black nuchal blotch, second at 

 front median dorsal spines, third on 

 hind dorsal rays ; 2 blue bauds trans- 

 versely on interorbital. 



perspicillatus. 



H'. Back without round black blotches; 



single blue line across interorbital. 



prosopotaenia. 



/'. Interorbital scales extend forward to 



nostrils ; second anal spine longer than 



postocular; head and front of trunk 



brown, rest yellowish ; black ocellus at 



eighth and ninth dorsal spines in 



young notophthalmus. 



y'. Outer mandibular teeth more or less 

 rounded, not truncate ; interorbital scales 

 not extending before eye ; brown, with 2 

 transverse blue interorbital hues; yel- 

 lowish spot on back at median dorsal 



spines pristiger. 



p'. Lower preopercle limb and interorbital scale- 

 less ; outer mtmdibular teeth rounded ter- 

 minally; back with 4 large, tiansverse 

 bands; cluster of black spots behind gill 



opening fasciatus. 



h\ Tetth uniserial. 



f. Paeapomacentktjs. Snout scaly ; 

 head, in protile, more conic or at- 

 tenuate; soft dorsal and anal with 

 front half dusky, posterior half 

 strongly contrasted yellowish 

 white; black basal pectoral blotch 

 over most of pectoral base and into 



axil of fin ovoides, 



f. Amblypomacentrus. Snout sca^e- 

 less ; head very obtuse, 

 w'. Caudal uniformly pale. 



breviceps. 

 «^ Caudal with large black basal 



blotch beauforti. 



. EupoMACKNTiu s. Dorsal spines 11 or 12; teeth uniserial, truncate; head 

 strongly obtuse; suborbitals and preopercle serrated; snout scaled. 



i;\ Suborbitals naked ; body longer, 



depth 2 to 2% lividus. 



V'. Suborbitals densely scaled; 



body deeper, depth 1% to 2. 



nigricans. 



