FISHES OF OREGON AND NORTHERN CALIFORNIA. 1638 
MEASUREMENTS OF CATOSTOMUS OCCIDENTALIS—Continued. 
Sacramento River basin—Continued. 
Cache Creek, Yolo County, Cal. 
SUEY OF DOUY..c..2sc.2e- soem mm... 212 
enppn head) 52223 223. case ok een anes | .23 
Depth body ..-........-. aa 
Depth canes pec ancle 
Length caudal! peduncle. 532 
Length snout......-.... : cit! 
Width lower lip. 
Diameter eye.....- a4 . 045 
Interorbital width ao 095, 
Depth head-....-.- ae mike 
Snout to occiput. < 195 
Snout to dorsal... 49 
Snout to ventral....-.- : 575 
Length base of dorsal. : 
Length base of anal... al 
Height dorsal....- - 175 
Height anal....-. 175 
Length pectoral. 195 
Length we é 15 
Length caudal. 255 
Dorsal rays..-... 12 
Seales lateral line. . 71 
Seales above lateral line. : 7} 
Seales before dorsal.......--... = 34 
Russian River basin. 
Dry Creek near Healdsburg. 
Length of body..-.----.........-..- mm.. 79) | 95 | 100 119 151 155 
Length head....- — 227 COG) 2250 ee. 28 -24 -25 
Depth body--.-....-.-- =215)) = 20. 123 235 - 23 - 235 
Depth caudal peduncle. . 085 08 «08 | .08 - 085 08 
Length caudal peduncle. -14 - 135 15 - 135 -14 16 
Length snout... 12 | 12 115 -12 -115 125 
Width lower lip. - -|  .05 - 055 | 042 | .05 045 045 
Diameter eye... -.- as . 055 SObsei ee aOain) © s-0D5, 05 05 
Interorbital width. asa) eM) nalyede site Pe ei tt) - 095 09 
Depth head......-- Soe iy Ai lehed | gas STD ye Sale | oily) 17 
Snout to dorsal.. Self act: 525 | .525| .53 51 52 
Snout to ventral. ..... 58 575 - 58 - 60 575 59 
Length base of dorsal. 19 18 | .18 18 185 175 
Length base of anal. . mee et ack tit 08 075 075 09 | 083 | 
Height dorsal......-. a5 -21 “19 19 -20 -19 185 | 
Height anal....- eed oat -185 75h} 9, att 175 | 
Length pectoral. 215 aval 205 215 20 20 
Length ventral -17 -17 16 -16 16 16 
Length eaudal. -28 +25 25 - 26 25 24 | 
Dorsal rays. ...-- 13 12 12 13 13 12 
Scales lateral line. . 70 67 69 65 68 70 
Seales above lateral line- ce 15 13 15 14 15 15 
Scales before dorsal.....-...-.-.-:.-..-.. 33 32 32 |? 32 31 35 
5. Catostomus humboldtianus, new species. 
The affinities of this species are with C. occidentalis of the Sacramento and adjacent streams. It 
differs from C. occidentalis in having larger scales between the occiput and insertion of dorsal (28 to 33 
rows against 30 to 36) and larger scales above the lateral line (11 to 14 rows between lateral line and 
middle of back near origin of dorsal, against 13 to 17). The mouth is larger than that of C. occidentalis, 
the papillose lips are broader, usually extend farther backward, and have larger papilla. The eye is 
smaller and the pectorals are rounded instead of pointed. The differences exhibited by the mouth 
and eye will usually serve to distinguish the species at a glance. From C. snyderi of the Klamath basin 
it differs in having fewer scales in the lateral series (62 to 69 in the lateral line against 70 to 77) and 
in having a much larger mouth with markedly broader lips. 
Distribution, Mad, Eel, and Bear rivers, Humboldt County, Cal. 
Head 4 in length; depth 4.25; depth of caudal peduncle 2.75 in head: eye 8; snout 2.14; interor- 
bital space 2.5; number of dorsal rays 12; anal rays7; scales in lateral line 67; above lateral line 12; 
between lateral line and ventral fin 9; between occiput and dorsal 30. 
