1866 Bulletm 4.7, U^iited States National Mtiseum. 



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 defined. 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 by 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 (jualities, especially excellent when salted; destined to become of 

 commercial importance. Here described from numerous specimens taken 

 at Attu Island, May 28, 1892 (Coll. Evermannj. {ixovoc,, one; Ttvepvyiov, 

 fin.) 

 Lahrax monopterygius, Pallas, Mem. Acad. Sci. Petersb., ii, 39], pi. 23, fig. 1, 1810, 



Unalaska; Pallas, Zoogr. Eosso-Aslat., m, 281, 1811. 

 Chirus monopterygius, Gunther, Cat., u, 92, 1860. 



Hexagrammus monopterygius, Jordan &, Gilberi, Sjuops's, C42, 1883. 

 Flem-ogrammns monopterygius, Turner, Coutr. Nat. Hist. Alaska, ii, 90, 1886. 



699. HEXAGRAMMOS (Steller) Tilesius. 

 (Rock Trout; Greenlings.) 



Dodecagrammos, Steller, in Kraaheniuuikof, Keise iu Kamcb.atka, 175, 1750 (nonbino- 



inial). 

 Hexagrammos, Steller MS. 



Hexagrammos, Tilesius, Act. Acad. Petrop.,'ii, 335, 1809 (atper). 

 Labrax (Steller MS.) Pallas, Mem. Acad. Petersb., 11, 382, 1810 (lagoccphalus). 

 Lebius (Steller MS.) Pallas, Zoograpbia Rosso-Asiat., in, 279, 1811 (sviierciUosug). 

 Chirus (Steller MS.) Pallas, Zoograpbia Eosso-Asiat., in, 279, 1811 (tvperciliosus). 

 Chirus, UuviER, Regno Auim., Ed. 11, vol. 2, 249, 1829 {superciliosus). 

 Chiropsis, GiRARD; V. S. Pac. R. R. Surv., x, Fisbe.s, 42, 1858 (constellatus) . 

 Oetogrammus, Bleeker, Yersl. Ak. A.mat., vi, 1370, 1874 (oetogrammus) . 

 Grammatopleurus, Gill, Proc. Ac. Nat. Sci. Phil. 1861, 166 (lagocephalus). 

 Acantholebius, Gill, Proc. Ac. Nat. Sci. Pbil. 1861, 166 (nebulosus; specimen witb the soft 



dorsal injured, the number of spines apparently increased) . 



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

 Mouth rather small, horizontal; jaws Avith bands of moderate sized, coni- 

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

 ahvays, a small patch 011 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 emar- 

 giuation 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, proeurrent base, the rays thick; ventraLs well developed, 

 placed at a consideral)le distance behind the root of the pectorals; 

 caudal subtruncate. Branchiostegals 6. Pyloric caeca numerous (about 



