64 
BULI.ETIN OF THF BUREAU OF FISHERIES. 
represented by specimens collected by Mr. Rutter near the type locality, San Joaquin River at Polasky, 
is a form characterized by large eyes, long head, and pointed snout, a symmetrical body with narrow 
caudal peduncle, and long fins. There are 9 rays in the dorsal, 8 in the anal.® The scales in the lateral 
line number from 47 to 53. A specimen 85 millimeters in length to base of caudal exhibits the follow- 
ing proportional measurements: Eength of head, .27; depth of body, .24; depth of caudal pedimcle, 
.10; length of snout, .09; diameter of eye, .07; interorbital width, .105; snout to dorsal, .585; snout to 
ventrals, .53; length of base of dorsal, .16; anal, .19; length of pectoral, .20; caudal, .32; scales in lateral 
line, 51; above lateral line, 13; below lateral line, 6; before dorsal, 30. Scales which appear to be 
typical are illustrated (fig. i, 2, 3, and 4). The apical radii number from 13 to 22, 15 to 20 represent- 
ing the usual number in individuals 2 or 3 years old. Lateral radii sometimes appear, but they are 
usually absent. 
No exact data are at hand concerning the species of Hesperoleucus inhabiting the great rivers tribu- 
tary to the Sacramento, and but little is known of those distributed throughout the valley of the San 
Joaquin. 
Hesperoleucus venustus, new species. Venw roach. 
This form inhabits the Russian River, the streams entering San Pablo, Suisun, and San Francisco 
Bays. It is characterized chiefly by long fins, a comparatively pointed snout, and slender caudal 
pedimcle, the whole body being trim and well proportioned. The dorsal and anal rays number 9 and 8, 
respectively. 
Description of the type, no. 74476 United States National Museum, from Coyote Creek near Gilroy 
Hot Springs, Cal. Length, 107 millimeters (fig. 2): 
Head 4.1 in length to base of caudal; depth 3.9; depth of caudal peduncle 2.5 in head; eye 4; 
interorbital space 2.7; snout 3; dorsal 9; anal 8; scales in lateral line 53 ; between lateral line and middle 
of back 13; between lateral line and origin of ventrals 7; between occiput and origin of dorsal 30. 
Body slender, the caudal peduncle narrow, head small, snout short and rather bluntly rounded; 
eye not included in anterior half of head nor entirely above a median line through body; mouth reach- 
ing a vertical which passes a little anterior to orbit. Gillrakers on first arch 10, very short, pointed and 
widely spaced. Pharyngeal teeth (cotypes) 4-5, 4 on the right side, occasionally 5-5 or 4-4; grinding 
surface narrow, equal in width to the tooth; tips of teeth hooked. Lateral line with a gentle downward 
curve on anterior hah. Origin of dorsal midway between posterior border of eye and base of caudal; 
anterior ray 1.3 in head, its tip when depressed not reaching as far posteriorly as that of last ray; edge 
“ Rutter (op. cit., Bulletin Biu-eau Fisheries, vol. xxvn, p. 138) records 10 rays in the dorsal and 9 in the anal, but an exami- 
nation of some of his specimens shows that he is in the habit of enumerating the last ray as 2 when it is deeply cleft, i. e. , branched. 
