CATOSTOMUS TAHOENSIS. 



173 



30. CATOSTOMUS LABIATUS Ayres. 



Thick-lipped Sucker. 



1855 Catostomus labiatus AYRES, Proc. Cal. Ac. Nat. Sc. i, 32. 



Catostomits lablatus GIRARD, Proc. AC. Nut. Sc. Phila. 175, 1856. 

 Catostomus laUatus GIRARD, U. S. Pac. R. R. Expl. x, 224, 1858. 

 Catosiomus labiatus JORDAN & COPELAND, Check List, 156, 1876. 



HABITAT. Streams of Oregon (Klamath Lake). 



hi have seeu only the specimen from which GirarcPs description was 

 taken. Like macrochilus, this species appears distinct from occidentalis, 

 but the examination of a larger series of specimens is necessary to 

 prove it. At present, it appears to differ from macrochilus and occiden- 

 talis in the smaller size of the dorsal fin. 



Specimens in United States National Museum. 



31. CATOSTOMUS AK^OPUS Jordan, sp. nov. 



Hard-headed Sucker. 



ISlSCatostomus arceopus JORDAN, MSS., Wheeler's Report Surv. W. 100th Mer. (ined.). 

 This species represents C. discobolus in the section Decadactylus. Its 

 very narrow fontanelle and sheathed lips indicate its close relation to 

 Pantosteus. The specific name is from apatos, small, thin ; o^, hole or 

 aperture. The typical specimens were from Kern River, California. 



Specimens in United States National Museum. 



H. W. Henshaw. 

 H. W. Henshaw. 



Kern River, Cal. (type) 

 Carson River. Nevada 



32. CATOSTOMUS TAHOENSIS Gill & Jordan. 

 Sucker of Lake Tahoe. 



186d Acomus generosus COOPER, Cronise's Nat. Wealth Cal. 495. (Not of Girard.) 

 l^o Catostomus tahoensis GILL & JORDAN, Bull. U. S. Nat. Mns. xi, p. . 

 HABITAT. Lake Tahoe, Nevada. 



The Sucker of Lake Tahoe is closely related to Catostomus longirostris, 

 but seems to differ constantly in the shorter head and more contracted 



