2870 Bulletin 4-7 y United States National Museum. 



ally from its parent form, Salmo clarkii henshawi. It may be described as 

 follows : 



780((1). SALMO CLAKKII TAHOENSIS, Jordan & Evermami, new subspecies. 

 (Silver Trout of Lake Tahoe.) 



Head 4n,-; depth 3^; eye 7f in head. D. 9; A. 12; Br. 10; scales 

 33-205-40; 140 pores. Pectoral 1| iu head; maxillary IJ. Body very 

 robust, compressed, unusually deep for a trout, the outline elliptical. 

 Head large, rather more compressed than iu typical 8alrno clarkii henshawi; 

 eye small, silvery. Vomerine teeth in 2 long series, those of the 2 

 series alternating in position; hyoid teeth distinct, in a rather long 

 series; gill rakers short, thickish, 5 + 13. Mouth large, the maxillary 

 extending well beyond the eye. Preopercle moderate, its lower posterior 

 edge not evenly rounded, but with a sligbtly projecting, rounded lobe and 

 a slight concavity above and below, this character not strongly marked; 

 opercle evenly, but not strongly, rounded. Scales small, reduced above 

 and below, those in or near lateral line largest. Fins moderate, the anal 

 rather high, with 1 more ray than usual; caudal slightly lunate, almost 

 truncate when spread open. Color dark green above, belly silvery ; sides 

 with a broad copperj^ shade covering cheeks and opercles; sides of lower 

 jaw yellowish; iius olivaceous, a little reddish below; orange dashes 

 between rami of lower jaw moderately consi)icuou8 ; back, from tip of 

 snout to tail, closely covered with large, unequal black spots; spots on 

 top of head and nape round; posteriorly the spots run together, forming 

 varioUiSly shaped markings, usually vertically oblong; those may be 

 regarded as formed of 3 or 4 spots placed in a series, or with 1 or 2 at the 

 side of the other ; the longest of the oblong markings not quite as long as 

 eye; along side of head and body the spots are very sparse, those on head 

 round, those behind vertically oblong; belly profusely covered with small 

 black spots which are nearly round; still smaller round spots numerous 

 on lower jaw; all the spots on caudal peduncle Aertically oblong or 

 curved; dorsal and caudal densely covered with oblong spots, smaller 

 than those on the body; anal with rather numerous round spots; pec- 

 torals and ventrals with a few small spots, the first ray in each case with a 

 series of faint small spots; adipose fin spotted. The above description 

 from a specimen 2 feet 4 inches long and weighing 7+ pounds. This form 

 attains a weight of 10 to 30 pounds and spawns only in the depths of 

 the lake. Salmo clarkii henshawi reaches a much smaller size, is much 

 darker in color, and spawns in the streams. Thus far known only from 

 the deep waters of Lake Tahoe. {iahoensis, from Lake Tahoe.) 



Salmo clarkii tahoengia, Jordan & Evebmann, new subspecies, Lake Tahoe. (Coll. 

 A. J. Bayley.) 



Page 518. It is wholly uncertain where Valenciennes got the specimen 

 which he called ThymaUus ontariensis. It is probably the ordinary Gray- 

 ling ( ThymaUus thymalltis) of Europe, erroneously attributed to Milbert's 

 New York collection. In any case, its identity with the Michigan Gray- 

 ling is more than doubtful, as the rivers in which the latter occurs were then 

 unexplored. The American Graylings would therefore stand as follows : 



