512 PROCEEDINGS OF THE ACADEMY OF [DeC., 



crowded, and in about 4 series on cheek. Lateral line of simple tubes, 

 and concurrent with dorsal profile. 



Origin of spinous dorsal behind that of ventral, spines graduated 

 from fifth, though fourth and sixth subequal, and margin of fin deeply- 

 notched. Last dorsal spine longer than second, though shorter than 

 third. Rayed dorsal begins about midway between origin of pectoral 

 and base of caudal, highest from first ray, though without lobe. Origin 

 of spinous anal falling about opposite origin of rayed dorsal, third 

 spine longest, and rayed fin similar to rayed dorsal. Caudal deeply 

 emarginate, lobes pointed. Pectoral short, reaching about f of space 

 to anal. Ventral inserted behind origin of pectoral, and reaching a 

 little over |- of space to origin of spinous anal. 



Color in alcohol pale brown, back slightly leaden, and lower surface 

 paler. Fins all plain pale brownish, margins of dorsals, and caudal 

 posteriorly, slightly dusky. Iris brassy-yellow. 



Length 5^ inches. 



Type, No. 11,556, A. N. S. P. Bonin Islands, between lat. 26° 30' 

 and 27° 44' N. and long. 140° and 143° E., in the North Pacific. Smith- 

 sonian Institution (No. 347). 



This form is apparently closely related to Dules marginatus Cuvier. 

 It differs from Tahiti examples of that species, however, in having 

 more scales in the lateral line. In this respect it agrees with Hawaiian 

 and Tahiti examples of Dules mato Lesson, though the latter differs 

 principally in having more gill-rakers. Examples of Dules rupestris 

 (Lacepede) from Samoa and Tahiti have the caudal but slightly emar- 

 ginate. 



(Named for the Bonin Islands.) 



BOULENGERINA subgen. nov. 

 Type Dules mato Lesson. 



Gill-rakers more numerous than in subgenus Dules. Boulengerina 

 has 24 to 28 on the lower part of the first arch, while Dules has 16 to 20. 



The specific name of the typical species dates from Dules mato 

 Lesson, Voij. Aut. Mond. Coquille, ZooL, III, 1830 (March 22, 1828), 

 p. 223, thus having priority over Dules malo Valenciennes, Hist. Nat. 

 Poiss., VII, 1831, p. 360. Kuhlia malo now in use must thus give 

 way to Dules mato. 



(Named for Dr. George A. Boulenger, of the British Museum, well 

 known among naturalists for many excellent works relative to the 

 lower vertebrates.) 



