1866 Bulletin ^7, United States National Museum. 



dusky on outer parts. Besides these 2 patterns of coloration, of which 

 the first is the more common, some individuals are dirty gray with the 

 bars not well denned. North Pacific; abundant about certain of the 

 Aleutian Islands, particularly Atka and Attu, rather rare at Unalaska and 

 about the Pribilof Islands, but erratic in its movements, ranging east to 

 Belkofski ; found in the kelp in 3 to 40 fathoms in spring and early summer, 

 when it can be readily caught hy jigging. It reaches a length of 18 inches 

 or more and a weight of 3 to 4 pounds. A most beautiful fish of excellent 

 food qualities, especially excellent when salted; destined to become of 

 commercial importance. Here described from numerous specimens taken 

 at Attu Island, May 28, 1892 (Coll. Evermannj. (f^or os, one ; rtrspvyior, 

 fin.) 

 Labrax monopterygius, PALLAS, M6m. Acad. Sci. Petersb., n, 391, pi. 23, fig. 1, 1810, 



Unalaska; PALLAS, Zoogr. Rosso- Asiat., m, 281, 1811. 

 Chirus monopterygius, GUNTHER, Cat., n, 92, 1860. 



Hexagrammus monopterygius, JORDAN & GILBERT, S.ynops ; s, 642, 1883. 

 Pleurogrammus monopterygius, TURNER, Contr. Nat. Hist. Alaska, n, 96, 1886. 



699. HEXAGRAMMOS (Steller) Tilesius. 

 (RocK TROUT; GREENLINGS.) 



Dodecagrammos, STELLER, in Krasheninuikof, Reise in Kamchatka, 175, 1750 (nonbino- 



mial). 



Hexagrammos, STELLER MS. 



Hexagrammos, TILESIUS, Act. Acad. Petrop., n, 335, 1809 (agper). 

 Labrax (STELLER MS.) PALLAS, Mem. Acad. Petersb., n, 382, 1810 (lagocephalus) . 

 Lebius (STELLER MS.) PALLAS, Zoographia Rosso- Asiat., m, 279, 1811 (superciliosut) . 

 Chirus (STELLER MS.) PALLAS, Zoographia Rosso- Asiat., in, 279, 1811 (tuperciliosus) . 

 Chirus, CuviER, Regne Auim., Ed. n, vol. 2, 249, 1829 (supercUiosus) . 

 Chiropsis, GIRARD, U. S. Pac. R. R. Surv., x, Fishes, 42, 1858 (constellatus) . 

 Octogrammus, BLEEKER, Versl. Ak. Amat., vi, 1370, 1874 (octogrammus) . 

 Orammatopleurus, GILL, Proc. Ac. Nat. Sci. Phil. 1861, 166 (lagocephctius). 

 Acantholebius, GILL, Proc. Ac. Nat. Sci. Phil. 1861, 166 (nebulosus; specimen with the soft 



dorsal injured, the number of spines apparently increased). 



Body oblong, somewhat compressed. Head subconical, blunt in profile. 

 Month rather small, horizontal; jaws with bands of moderate sized, coni- 

 cal teeth, the outer row enlarged ; teeth on vomer, and usually but not 

 always, a small patch on the palatines; preopercle unarmed; a fringed 

 supraorbital cirrus, large or small; gill membranes broadly connected, 

 free from the isthmus; gill rakers short, tubercle-like. Scales small, 

 mostly ctenoid, sometimes partly or wholly cycloid; head more or less 

 scaly, without spines; nostril simple, round, with a pore behind it. 

 Lateral lines usually 5 on each side. Dorsal fin long, with a deep ernar- 

 gination between the spines and the soft rays; dorsal spines slender, 

 19 to 22 in number; anal fin elongate, with a single rudimentary spine; 

 rays of pectorals and anal exserted and almost simple; pectoral rounded, 

 with broad, procurrent base, the rays thick; ventrals well developed, 

 placed at a considerable distance behind the root of the pectorals; 

 caudal subtruncate. Branchiostegals 6. Pyloric cseca numerous (about 



