66 
BULI.ETIN OE THE BUREAU OF FISHERIES. 
individuals. Lateral line with a slight downward cmve on anterior part of body. Origin of dorsal 
midway between center of pupil and base of caudal; height of longest rays contained 1.4 times in head; 
border of fin straight; rays all reaching an equal distance posteriorly when depressed. Ventrals inserted 
a little anterior to dorsal, the tips reaching anal opening, the edges rounded. Anal i .7 in head, the edge 
straight. Caudal deeply incised, the lobes rather pointed, equal in length to head. Pectorals rotmded, 
1.2 in head. 
Color in spirits, dark brown above, lighter and with a silver reflection below; a straight stripe about 
2 scales wide extending from upper edge of gill opening to base of caudal, entirely above lateral line; 
below this a dark stripe, somewhat wider, and then a series of narrow, light and dark stripes which 
become less distinct ventrally and finally disappear. 
Of 72 specimens examined, 68 had 8 anal rays, 3 had 7, and i had 9, while all had 8 dorsal rays. 
There are usually from 51 to 59 scales in the lateral line and ii to 13 above it. The scales (fig. 11-13) 
are generally spatulate in form, mostly longer than broad; the apical edge very convex or even pointed, 
lateral edges usually sloping somewhat toward apex, basal edge double concave with a rather pronounced 
median prolongation which is the base of a strong median ridge ; basolateral ridges prominent, apicolat- 
eral ridges more or less indistinct; apical region of scales located notably near the basal edge; basal 
slope abrupt; apical slope gentle. Basal radii absent; lateral radii weak and irregular, sometimes absent 
on one or both sides, numbering from i to 5; apical radii 14 to 24, usually 16 to 20. 
Measurements of a series of 10 specimens of this species are given in “The Fishes of the Coastal 
Streams of Oregon and Northern California” (Snyder, Bulletin of the Bmeau of Fisheries, vol. xxvii 
p. 177, Rutilus symmetricus near Philo, Cal.). 
Hesperoleucus parvipinnis, new species. Short-finned roach. 
This form, found in the Gualala River basin, is characterized by the robust body, deep caudal 
peduncle, short snout, short, rounded fins, and by having 8 and 7 rays in the dorsal and anal fins. 
Description of the type, no. 74466, United States National Museum, Gualala River, Sonoma County, 
Cal. Length 83 millimeters. 
Head 3.9 in length to base of caudal; depth 3.9; depth caudal peduncle 2.2 in head; eye 4.2; inter- 
orbital space 2.8; snout 3; dorsal 8; anal 7; scales in lateral line 59; between lateral line and middle of 
back 13; between lateral line and origin of ventral 8; between occiput and origin of dorsal 30. 
Body deep, the caudal peduncle deep and heavy; eye not altogether in anterior part of head, and 
projecting a little below a median line alongside of body. Gillrakers on anterior arch 8, very short 
and stumpy. Pharyngeal teeth (cotypes) 4-5, 4 on the right side, the grinding surface no wider than the 
main shaft of the tooth; well defined hooks present. No variation appeared on an examination of the 
teeth of a number of specimens. Anterior third of lateral line with a gentle downward ciu’ve, the 
remainder straight. Origin of dorsal midway between posterior margin of eye and base of caudal fin; 
anterior rays highest, 1.4 in length of head, falling somewhat short of tips of posterior rays in depressed 
fin. Ventrals inserted anterior to a vertical through origin of dorsal, reaching anal opening when 
depressed, their edges rounded. Anal 1.5 in head; rounded. Caudal deeply emarginate, the lobes 
rounded; the length slightly less than that of head. Pectoral rounded, 1.2 in head. 
Color in spirits dusky above, lighter below; a light lateral stripe two scales wide extending from 
upper edge of gill opening to base of caudal and entirely above lateral line; below this a somewhat wider 
dark stripe, which in turn is followed by several narrower and very distinct dark stripes which grow 
lighter ventrally. 
In 80 specimens of H. parvipinnis, 70 had 7 anal rays, 9 had 8, and i had 6, all having 8 dorsal rays. 
There are usually from 54 to 59 scales in the lateral line, and 14 to 16 rows above it. The scales (fig. 
14-16, pi. xiii) are rather small, usually somewhat longer than broad, generally quadrangular, the apical 
and basal edges not very strongly convex ; lateral edges almost parallel . Spatulate examples are not rare. 
The apical slope gentle, basal slope abrupt; basolateral ridges prominent, the others well marked. No 
