FISHES OF streams TRIBUTARY TO MONTEREY BAY. 67 
basal radii present; lateral radii weak and few in number, i to 4: often absent; apical radii ii to 24, 
usually 13 to 19. 
Measurements of a series of specimens are recorded in the paper above referred to. (Snyder, Bulletin 
of the Bureau of Fisheries, vol. xxvii, p. 177, Rutilus symmetricus.) 
Hesperoleucus mitrulus, new species. Northern roach. 
This name is proposed for the form found in the streams tributary to the north end of Goose Fake, 
a basin properly belonging to the Sacramento system, but practically separated from it. This species 
has not been reported from the turbulent streams that flow into Goose Lake from the moimtains on the 
eastern side, nor has it been taken in the lake itself. It is characterized by the short dorsal and anal, 
8 and 7 rays, respectively, by having the fins lower and shorter than those of related forms, and in the 
peculiar cup-like shape of the scales. 
Description of the type, no. 74474 United States National Museum, from Drew Creek, Lake County, 
Oreg. Length, 84 millimeters. 
Head 4.7 in length to base of caudal; depth 4.7; depth caudal peduncle 2.4 in head; eye 4.6; 
interorbital area 3; snout 3; dorsal rays 8; anal rays 7; scales in lateral line 60; between lateral line and 
middle of back, 14; between lateral line and origin of ventral, 8; between occiput and origin of dorsal, 37. 
Body rather deep and heavy, perhaps a little more slender than that of M. navarroensis or M. parvi- 
pinnis; snout short and rounded; eye entirely within anterior part of head, and not quite above a median 
lateral line of body. Gillrakers of first arch, 9; very small. Pharyngeal teeth (cotypes), 4-5, 4 on the 
right side; a grinding surface about equal in width to the shaft of tooth; small hooks at tips. Lateral 
line with a gentle downward curve on anterior half. Insertion of dorsal midway between center of pupil 
and base of caudal, the height about 1.6 in head, the edge rounded; ventrals inserted anterior to dorsal, 
tlie edges roimded, not reaching vent when fin is depressed. Anal rounded posteriorly; 1.8 in head. 
Caudal deeply incised, the lobes rounded; slightly longer than head. Pectorals rounded; 1.7 in head. 
Color in spirits dark brown above, lighter beneath; no dark pigment on the ventral surface. A 
light stripe 2 scales wide passing from upper edge of gill opening to base of caudal, entirely above lateral 
line; beneath this a conspicuous dark stripe which is narrowed to a line anteriorly, nearly 3 scales broad 
posteriorly; sides anteriorly with several very narrow and indistinct dark stripes. 
When examined under the microscope, the scales (fig. 17-20, pi. xxiii) are seen to be very convex, 
almost conical, usually though not always rounded, the basal edge scalloped. They are small in size, 
there being 54 to 61 in lateral series, 32 to 38 before the dorsal, and 12 to 15 above the lateral line. Basal 
radii are present in large number, and they are distinct and strong, occasionally entering the nuclear 
area of the scale. They number from 8 to 17, usually 12 to 15. The ridges of the scales being scarcely 
developed, there is no sharp line of demarkation between apical, lateral, or basal regions. The apical 
radii number from about 13 to 20, usually 15 to 18; lateral radii 3 to 9, generally 4 to 6 or 7. Measme- 
ments of 20 examples of this species were published in the paper previously referred to. (Snyder, 
Bulletin of the Bureau of Fisheries, vol. xxvii, p. 98, Rutilus symmetricus.) 
Hesperoleucus subditus, new species. Monterey roach. 
This species is related to H. venustus of Coyote Creek and other streams tributary to San Francisco 
Bay. It differs in having a somewhat more robust body, slightly shorter fins, fewer dorsal and anal 
rays, and a smaller number of scales in the lateral line. 
Description of the type, no. 74475, United States National Museum, from Uvas Creek, Pajaro River 
basin, Santa Clara Coxmty, Cal. Length, no millimeters. (Fig. 3.) 
Head 3.8 in length to base of caudal; depth 3.6; depth caudal peduncle 2.3 in head; eye 4.4; 
interorbital area 2.6; snout 3.1; dorsal rays 8; anal rays 7; scales in lateral line 53; between lateral 
line and middle of back 14; between lateral line and origin of ventral 7; between occiput and origin 
of dorsal 28. 
