164 BULLETIN OF THE BUREAU OF FISHERIES. 
Width of mouth contained about 4 times in length of head; upper lip with 6 or 7 rows of papillee ante- 
rior to mouth, lower lip split nearly to border of mouth; one or two rows of papillee between cleft and 
border of lip; distance between anterior border of upper lip and posterior border of lobe of lower lip 2.9 
in head; inner border of lips smooth and hard; 3 rows of minute papillae between inner border of upper 
lip and the valve. Interorbital area convex. Length of fontanelle about equal to diameter of orbit. 
Origin of dorsal fin midway between t*~ »f snout and base of caudal fin; height of longest dorsal 
ray somewhat greater than length of bas: ‘he latter contained 6.6 times in the length. Height 
of anal 2.3 times length of its base, 5 in ti tip of fin when depressed just reaching base of lower 
caudal rays. Pectoral rays 18, the longe. -ained 5.1 in the length. Origin of ventral below ninth 
dorsal ray, the fin when depressed not reaching anal opening, 6.75 in the length. Caudal 4.8 in the 
length. 
The scales grow gradually larger porteriorly, those on caudal peduncle being about twice the width 
of the anterior ones. 
Color dusky above, the scales with dark borders; dorsal, caudal, and upper side of pectorals dusky; 
ventrals and anal whitish. Occasional spec’mens are somewhat brassy, having whitish tubercles on 
lower part of caudal peduncle, on anal and lower half of caudal fin. 
Fig. 1.—Catostomus humboldtianus, new species. Type. 
Type, in U. S. National Museum, a specimen from the south fork of Eel River, near Garberville, 
Humboldt County, Cal. Cotype no. 9861, Stanford University. 
No differences have been detected between specimens from Bear, Eel, and Mad rivers. (©. hum- 
boldtianus appears to be a slightly differentiated form of C. occidentalis, resembling that species much 
more closely than C. snyderi of the Klamath. It is well to note in this connection that but little is 
known of C. snyderi, and a detailed and thorough examination of (. occidentalis is yet to be made. 
Bear, Eel, and Mad rivers. 
MEASUREMENTS OF CATOSTOMUS HUMBOLDTIANUS. 
Eel River. Mad River. 
Length of body.......... 2 as 234 239 221 227 203 185 198 185 175 190 
Length head. . =|) 120 -245 | .24 245 | .24 ~25 - 26 -265 | .25 - 26 
Depth body......... 24 .235 | .22 ~24 -23 +23 - 22 215 | .24 - 23 
Depth caudal peduncle. - 095 | .095 |) .09 O9Dsl ie a A : 3 
Length caudal peduncle el) ealedin|  oalze -165 | .16 -16 -16 -16 -15 +168 | .155 
Length snout..-......... al 1259} -D15s}) Ss] 03 +12 -13 13 o80))| Lou een 
Width lower lip 3 -065 | .055 | .062 | .062| .07 - 067 -065 | .055 | .065 
Diameter eye... =.-. -035 | .033 | .035 | .038 | .04 . 04 - 04 -035 | .04 
Interorbital width. Sl ai a0 -098 } .098} .105) .10 - 098 -105} .10 - 105 
Depth head.......- Sat) Sal Si |) oalletey || aly) clr éai|} Sak} -18 -175 | .18 -18 
Snout to occiput - Eh ole | Se! - 21 +215] .205| .225) .23 +225\| .20 24 
Snout to dorsal. . -515 | .51 - 51 - 50 -505 | . 52 - 53 +525'| . 505 | .52 
Snout to ventral. -...- .575 | .575 | .60 - 59 - 58 - 60 - 59 . 62 -625 | .59 
Length base of dorsal. 15 14 -145 | .153 | .145] .15 ~15 -145 | .155]) .165 
Length base of anal. - - -| .085 | .07 -063 | .08 -065 | .08 ~072 | .075 | .07 - 08 
Height dorsal... ---- -| 18 -165 | .16 -17 18 =165) | .155))| .155) | 216 -16 
Height anal. ---- Allie e740) -17 slitz 920) oats) SUPA Ie make} -175 | .18 sity) 
Length pectoral. -205 | .19 -18 ~20 195 | .205) .185} .18 195 | .18 
Length ventral -. AN) Penlisee feats | esi aia ll Tay, Wa ga Smet oil Il) Sv 
ID aveAn ay GAN oa seas bebo sbooomeconeeesceuesagcecses .235 | .21 21 -215 | .24 = 22 APA .22 -23 m220) 
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