784 Bulletin 47, United States National Museum. 



posteriorly ; lateral line developed ; preopercle entire or very nearly so. 

 Vertebrse 17 -f 17 = 34. Atlantic Slope, in cold or clear lakes and rivers. 

 ;, perch; 6i/uf, appearance.) 



1145. PERCOPSIS GUTTATUS, Agassiz. 

 (SAND ROLLER ; TROUT PERCH.) 



Head 3 ; depth about 4fc. D. II, 9; A. I, 7 ; V. I, 8; scales 50. Head 

 slender and conical ; mouth small, subinferior, maxillary not nearly 

 reaching front of orbit. Caudal peduncle long and slender. Pale oliva- 

 ceous, a silvery stripe along the lateral line, becoming obsolete forwards ; 

 upper parts with obscure round dusky spots made of dark points. Peri- 

 toneum silvery. Length 6 inches. Spawns in spring. Delaware River 

 (Abbott) to Ohio River (Sloan; Gilbert); Kansas and northward; very 

 abundant in the Great Lakes ; in all streams tributary to Hudson Bay, 

 Red River of the North, and found by Dr. Eigenmann in the Saskatche- 

 wan as far as Medicine Hat ; rare in streams south of Lake Erie, although 

 occasionally taken throughout the upper Mississippi Valley, (guttatw, 

 spotted.) 



Percopsis gultalus, AGASSIZ, Lake Superior, 286, 1850, Lake Superior; GATHER, Cat., vi, 207, 

 1866; JORDAN & GILBERT, Synopsis, 322, 1883; EIGENMANN, Science, Oct. 21, 1892, 233. 



Salmoperca pellucida, THOMPSON, Appendix Hist. Vt., 33, 1853, Lake Champlain. (Coll. Thomp- 

 son.) 



Percopsis hammondi* GILL, Proc. Ac. Nat. Sci. Phila., 1864, 151, Kansas. (Coll. Hammond.) 



350. COLUMBIA, Eigenmann & Eigenmann. 



Columbia, EIGENMANN & EIQENMANN, Science, Oct. 21, 1892, 233, (transmontana). 



Body rather robust, little translucent, covered with strongly ctenoid 

 scales which are roughest anteriorly ; lateral line obscure or imperfect ; 

 angle of preopercle with a few stoutish spines. Dorsal and anal fins each 

 with two very strong spines ; a short ventral spine. One species, in 

 rivers of the Pacific slope. (Named for the Columbia River, itself for John 

 Kendricks's ship, the Columbia; the name derived from that of Cristi- 

 foro Colon, who came to America just four hundred years before this fish 

 was discovered.) 



1146. COLUMBIA TRANSMONTANA, Eigenmann & Eigenmann. 



Head 3 to 3| ; depth 3 to 4 ; eye 3, equal to snout. D. II, 9 ; A. II, 

 6; scales 7 to 9-44 to 46-7. Body comparatively deep, the dorsal profile 

 more arched than the ventral, making an angle at origin of dorsal ; sides 

 compressed, the tail most so. Head short and chubby. First dorsal 

 spine as long as pupil ; second half length of head, recurved, very deeply 

 grooved behind ; anal spines lower than dorsal spines, the second longest; 

 ventrals reaching past vent; nape scaled. Semitranslucent smutty 

 green; sides with three rows of oblong blackish spots, the middle and 



* Head larger, 3% in length, exclusive of caudal ; dorsal higher, the longest ray 4% in length; 

 anal higher, longest ray 6 in length; pectoral equals height of dorsal; ventral 5% in length, 

 reaching vent, which is nearer snoot than margin of caudal fin. Kansas. (Gill.) 



