Jordan and Evermann. — Fishes of North America. 495 



spread open. Color dark-green above, belly silvery : sides with a broad 

 coppery shade covering cheeks and opercles ; sides of lower jaw yellowish ; 

 fins olivaceous, a little reddish below. Orange dashes between rami of 

 lower jaw moderately conspicuous. 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 variously 

 shaped markings, usually vertically oblong: these may be regarded as 

 formed of three or four spots placed in a series, or with one or two at the 

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

 long as eye. Along side of head and body the spots are very sjjarse. 

 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 

 vertically oblong or curved. Dorsal and caudal densely covered with 

 oblong spots, smaller than those on the body. Anal with rather numerous 

 round spots; pectorals and ventrals with a few small spots, the first ray 

 in each case with a series of faint small spots ; adipose tin spotted. 



(Named for Henry W. Henshaw, naturalist of the Geological Survey 

 west of the 100th meridian, who discovered the species.) 

 iialmo heiishaui, GiLL & Jordan, Mau. Vert., Ed. 2, 358, 1878, Lake Tahoe; Jordan & Henshaw, 



Kept. Chief Eng., Part 3, 1878, App. KN, 1619, plate iv; Jordan, Proc. C. .S. Nat. Mus., i, 



1878, 75; Jordan & Gilbert, Synopsis, 316, 1883. 

 Salmo t.iuppitcli, Jordan & Henshaw, Eept. Chief Engineers, Part 3, 1878, App. NN., 1618; not 



of Richardson. 



Represented in the lakes and streams of the Great Basin (Lake Bonne- 

 ville) by 



779e. SALMO MIKISS VIRGIXALIS (Girard). 

 (Trout of Utah Lake.) 



Profusely but rather finely spotted, the spots being numerous anteriorly 

 as well as posteriorly, confined to the back rather than to the tail. 

 Scales a little larger than in other forms, 140 to 150 in lengthwise series, 

 anteriorly less crowded than in spihirus and stomias. In partially 

 alkaline or milky waters, as in Utah Lake, this form reaches a 

 large size — 8 to 12 pounds — and is very pale in color, the dark spots few 

 and small, mostly confined to the back. Similar variations are shown 

 by the other forms of trout in other lakes. Lakes and streams west of 

 the Wahsatch range, especially in Bear, Provo, Jordan, and Sevier 

 rivers, and in Utah Lake; locally very abundant and of importance as a 

 food-fish. (ri?Y/iHfl//s, like a virgin.) 



Solar rirginalis, Girard, Proc. Ac. Nat. Sci. Phila, 1856, 220, Utah Lake. 



Salmo Utah, SlCKLEY, Mouogr. Sftlmo, 136, 1861 (1874), Utah Lake ; pale specimens from the lake. 



Salynu mi/kiss lirginalk, Jordan, Bull. U. S. Fish Comra., ix, 1889, 14, pi. 3, fig. 9. 



Kepresented in the Rio Grande Basin by 



779f. SALMO MYKISS SPILURUS (Cope). 



(Rio Gr.^nde Trout.) 



Head 3i; depth 4. D. 11; A. 10; scales 37-160-37. Head heavy, but pro- 

 portionately short, its upper surface considerably decurved ; iuterorbital 

 space transversely convex, obtusely carinated : the head more convex 

 than in any other of our- species. Mouth large, maxillary reaching 

 past eye. Teeth on vomer in two distinct series. Dorsal fin low in 



