CATOSTOMUS TAHOENSIS. 



173 



30. CATOSTOMUS LABIATUS Ayres. 



Thick-lipped Suclcer, 



1855 — Catostomus laiiatus Ayres, Proc. Cal. Ac. Nat. Sc. i, 32. 



Catosiomus laUatua Girard, Proc. Ac. Nat. Sc. Phila. 175, 1856. 

 Catostomiis laiiafus Girard, U. S. Pac. K. R. Expl. x, 224, 1858. 

 Catosiomu.9 lahiatiis Jordan & Copeland, Check List, 156, 1876. 



Habitat. — Streams of Oregon (Klamath Lake). 



I have seen only the specimen from wliich Girard's desciiptiou was 

 taken. Like macrochilus, this species ai)pears distinct I'roin occidenialis, 

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

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

 talis in the smaller size of the dorsal fin. 



Specimens in United States National Museum. 



31. CATOSTOMUS AR^OPUS Jordaii, sp. nov. 

 Hard-headed Sucker. 

 1878 — Catostomus arceopus Jordan, MSS., Wheeler's Rejort Siirv. W. 100th Mer. (ined.). 

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

 very narrow foutanelle and sheathed lips indicate its close relation to 

 Pantosteus. The specific name is from apacdc, small, thin; o-ry, hole or 

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



Specimens in United States National Museum. 



32. CATOSTOMUS TAHOENSIS Gill t0 Jordan. 



Sucker of iMke Tahoe. 



1868 — Acomus geticrosus Cooper, Cronise's Nat. Wealth Cal. 495. (Not of Girard.) 

 1878 — Catostomxis tahoensis Gill & Jordan, Bull. U. S. Nat. Mus. xi, p. — . 



Haditat. — Lake Tahoe, Nevada. 



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

 but seems to differ constantly in the shorter head and mor*? contracted 



