1883.] 



NATURAL SCIENCES OF PHILADELPHIA. 



U1 



width. Mouth opening obliquely upwards, the maxillary not quite 

 reaching the anterior edge of the eye. 



Measurements. 



Total length with caudal fin, 



Length to edge of operculum, 



Length to line of dorsal fin on lateral line, 



Length to line of ventral fin on lateral line, 



Length to line of anal fin on lateral line. 



Length to base of caudal on lateral line. 



Depth at first dorsal ray. 



Depth at fix'st anal ray, 



Depth of caudal peduncle. 



Diameter of interorbital space, 



Diameter of eye, . . 



M. 



on 



016 



032.3 



0328 



045 



061 



0133 



0105 



0068 



045 



0445 



Belly and sides silvery ; a straight lead-colored lateral band ; 

 above this, pale reddish (in spirits). The leaden band is inter- 

 rupted at the base of the caudal fin by a vertical band of straw- 

 yellow, which has a dark posterior edge. 



In the species of Leuciis from the same locality (Pyramid Lake), 

 there are 23 or 24 longitudinal rows of scales; in this one there are 

 only 11. 



SQTJ ALIUS Bonap. 

 Jordan, Sj nopsis Fishes N. America, p. 230. 



The species of this genus, as defined by Jordan, that I have 

 observed in the Oregon Lakes, are two, which differ as follows : 



Scales 13-63-7 ; dorsal rays I. 9 ; head 3-'l5 to 4 times in length; 

 depth in do. 4 times ; eyes in head 4*25 times ; teeth 2*5-5*2. 



S. coeruleus. 



Scales 12-60-5; dorsal rays 1.8; head 4 times in length; 



depth in do. 4-25 times ; eye in head 3 times ; teeth 1'4-5'1. 



S. galtix. 

 S^nalius coeruleus Girard. Jord«n, 1. c, p, 241. 



Abundant in Klamath Lake. The specimens differ among 



themselves somewhat ; thus, the depth enters the length 3'60 times 



in some; 4 times in others. The dorsal fin originates above the 



ventral in some ; a little behind in others. The teeth all have the 



grinding surface distinct, and the dorsal fin always has I. 9 rays. 



Length of the longest specimen, 5^ inches. 



