1544 Bulletin 4.7, United States National Museum. 



group the Pomacentridw are probably descended. (Pomaeentridce, Gliiither, 

 Cat., iv, 2-64.) 



I. Scales large, 25 to 40 in lengthwise series. 



POMACENTRIN^ : 



a Teeth fixed, conical or incisor-like, covering nearly the whole free edge of each 



jaw; carnivorous species. 

 &. Teeth conical, in 2 to 4 series, the outer enlarged and bluntish; preopercle 



entire ; scales large. 



c. Body slender, the depth about length; lateral line subcomplete ; tail 

 deeply forked. AZURINA, 620. 



cc. Body oblong, the depth to f length ; lateral line wanting on tail. 



CHROMIS, 621. 

 bb. Teeth more or less flattened or incisor-like, in 1 or 2 series. 



d. Preopercle, and usually preorbital also, sharply serrate. 



e. Teeth entire, strictly uniserial in each jaw,- preorbital not very 

 deep, its edge not notched; snout scaly; lower jaw naked. 



EUPOMACENTRUS, 622. 



dd. Preopercle and preorbital strictly entire; snout naked. 



/. Suborbitals entirely adnate to the cheeks. NEXILARIUS, 623. 



ff. Suborbitals not adnate to the cheeks. 



g. Teeth emarginate or Y-shaped; preorbital moderate. 



ABUDEFDUF, 624 

 gg. Teeth entire; preorbital very deep. HYPSYPOPS, 625, 



MlCROSPATHODONTIN^E : 



aa. Teeth movable, incisor-like, in 1 row on front of each jaw; the lower jaw 

 weak, with teeth along its front only ; preopercle and preorbital entire ; 

 snout scaled almost to lips ; preorbital notched behind nostril; lower limb 

 of preopercle scaled ; soft dorsal and anal elevated ; caudal deeply forked ; 

 soft anal rather long, of 14 or 15 rays ; herbivorous species. 



MlCROSPATHODON, 626. 



620. AZURINA, Jordan & McGregor, new genus. 

 kzurina, JORDAN & MCGREGOR MS., Fishes of the Revillagigedo Islands, 1898 (hirundo). 



This genus is closely allied to Chromis, from which it differs in the long 

 and slender body, the low vertical fins, the very deeply forked tail, the 

 pointed snout, and especially in the continuous lateral line which extends 

 much beyond the dorsal tin and is wanting on but 2 or 3 scales, (azurem, 

 blue.) 



1953. AZURINA HIRUNDO, Jordan & McGregor, new species. 



Head 4 in length; depth 3. D. XII, 11; A. II, 11; scales 34; maxillary 

 3 in head; eye 4; pectoral 1; ventral 1|; longest dorsal spine 3|, longest 

 soft ray 4; second anal spine 3^, longest soft ray 3; caudal lobes 1^; middle 

 caudal rays 4. Body elongate elliptical, slender and symmetrical; mod- 

 erately compressed; snout acute; profile slightly depressed above. Eye 

 moderate, larger than in related species ; maxillary reaching to below front 

 of eye. Teeth conical, rather few and small, in narrow bands or almost a 

 single series Preorbital very narrow, about eye; suborbital hidden by 

 scales. Preopercle narrow, largely free, its edge slightly crenulate ; gill 

 rakers 36, long and slender; head covered with small scales except throat 

 and tip of snout; those on body large and ctenoid; lateral line strongly 

 curved, continuous, extending downward along the tail, wanting on 2 or 



