134 BULLETIN OF THE BUREAU OF FISHERIES. 
12. Leuciscus crassicauda (Baird & Girard). Sacramento Chub. 
Leuciscus gibbosus Ayres, Daily Placer Times and Transcript, May 30, 1854, San Francisco. 
Lavinia crassicauda Baird & Girard, Proc. Ac. Nat. Sci. Phila., 1854, p. 137, San Joaquin River. 
Lavinia gibbosa Ayres, Proc. Cal. Ac. Nat. Sci. 1854, p. 20, San Francisco markets. 
Tigoma crassa Girard, Proc. Ac. Nat. Sci. Phila., 1856, p. 207, Sacramento River. 
Siboma crassicauda Girard, op. cit., p. 208. 
Squalius gibbosus, Jordan & Gilbert, Synopsis Fishes of North Amer., p. 239, 1882. 
Squalius crassus Jordan & Gilbert, op. cit., p. 241. 
Leuciscus crassicauda, Jordan & Evermann, Fishes N. & Mid. Amer., pt. I, p. 231, 1896. 
Of this species we have two specimens, 4 and 9 inches long. The measurements of the larger are: 
Head 3.8 in body, depth 3.7; eye 6 in head, snout 3.1; teeth 2, 54, 2; dorsal 9, anal 9; scales 
12-54-6. For the smaller specimen: Head 3.6 in body, depth 3.9; eye 4.6 in head, snout 3.2; teeth 
2, 544, 1; dorsal 8, anal 9, scales 10-53-6. 
Head conical, profile straight, snout acuminate, mouth oblique, jaws even, maxillary extending 
to vertical through nostrils, slipping under preorbital. Body elongate, somewhat compressed, the 
dorsal outline strongly arched at occiput in larger specimen (regularly arched from snout to dorsal in 
smaller specimen); caudal peduncle very deep and compressed, 1.9 in head, not at all expanding at 
base of caudal; origin of dorsal midway between tip of snout and tip of middle caudal rays, ventrals 
inserted under or slightly in advance of origin of dorsal, origin of anal entirely behind dorsal; margin 
of dorsal and anal convex; caudal fin shorter than head, forked, middle rays 1.6 in longest, lobes equal; 
lateral line nearly straight. Dusky above, changing to silvery below. Young with a black spot at 
base of caudal. 
Loca DistriBurtIoN. 
Locality. | Stream or lake. Collector. Name as reported. Authority. 
oe. | 
Sanirancisco.--)--2 ee | Hamm OnGs ae eee = Lavinia crassicauda ..| Girard, 1854. 
OMe elRAty MeSH ost sc cemeeeceee ED DOsae= teases ae Ayres, 1854, 1854-7. 
DO nse ere ee ee escase a | pa tecseteeges erate cee -| Lockington..........- Siboma crassicauda...| Lockington. 
one ok sete wee eee Squalius gibbosus....} Jordan and Jouy. 
Fort Reading Newberryn ss sce-seeee Tigoma crassa....-..- Girard, 1856, 1857, 1858. 
Mouth of Feather River..).....do....- _-| Rutter & Scofield. ._.. Leuciscus crassicauda 
Clear Lake.........-. .-| Jordan & Gilbert.....|....- GOxccececuessecee: Jordan & Gilbert. 
San Joaquin River......-| Heermann...-...-...- Siboma crassicauda ..| Girard, 1856. 
Merced River.-.-.-.- sul eeese Oe cher en ceccceers|teose GOL use esas Do. 
St. John Channel.....--- Kaweah River. ......----- Rutter & Atkinson...| Leuciscus crassicauda 
There is some doubt as to the validity of the nominal species Leuciscus conformis. Girard’s notes 
and descriptions are entirely conflicting, and his type is the only specimen ever reported. His com- 
parative statement of the differences between crassicauda and conformis is just the opposite of the dif- 
ferences found in his descriptions of the two species. 
The two nominal species are represented in our collection by four specimens, two of which are 
crassicauda, as noted above. The other two are different, apparently, and we place them provisionally 
under the name Leuciscus conformis (Baird & Girard). 
13. Leuciscus conformis (Baird & Girard). 
Lavinia conformis Baird & Girard, Proc. Ac. Nat. Sci. Phila. 1854, p. 137, Poso Creek, Tulare Valley. 
Tigoma conformis Girard, Pacific Ry. Survey, vol. x, p. 289, 1858. 
Leuciscus conformis Jordan & Evermann, Fishes North & Mid. Amer., pt. I, p. 231, 1896. 
Of this species we also have two specimens, one 7 inches long, the other 3.5. The measurements 
of the larger specimen are: 
Head 4 in body; depth 3.5; eye 4.5 in head; snout 3.6; dorsal 10, anal 11, scales 12-57-7. The 
smaller specimen has the eye 4 in head, dorsal 11; anal 11; scales 12-60-5; teeth 1, 5-5, 1. 
The head is conical, the profile slightly convex, the snout rather pointed; the mouth is oblique, 
the lower jaw included; the maxillary extends to vertical through middle of nostril, slipping under 
preorbital. The body is rather deep, compressed, regularly tapering to both extremities; the caudal 
peduncle is deep, 2.2 in head, expanded at base of caudal as usual in minnows. The origin of the 
dorsal is midway between tip of saout and middle of middle caudal rays; ventrals inserted slightly in 
