174 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



body. It is said to be very abundant in Lake Talioe. " They are caught 

 in nets and sometimes with the hook, but like all this family are rather 

 poor as food" (Cooper}. Acomus generosus of Girard, with which this 

 species has been ideutib'ed, is a very different species, belonging to a 

 different genus. 



Specimen* in United States National Museum. 



33. CATOSTOMUS ROSTRATUS (Tilesius) Jordan. 



Siberian Sucker. 

 1813 " Cyprinus rostratus TILESIUS, Me"m. Ac. Sc. St. P6tersbourg, iv, p. 454, tab. 15, 



figs. 1-2, 1813." 



Cyprinus rostratus PALLAS, Zoogr. Rosso- Asiat. iii, 308. 

 Cijpnus rostratus G^NTHER, Cat. Fishes Brit. Mus. xii, 12, 1868. (As doubtful 



species of Catostomus.) 



18HCatostomus tilesii CUVIKR & VALENCIENNES, Hist. Nat. des Poissone, xvii, 469, 

 1844. 



HABITAT. Eastern Siberia. 



No writer since Tilesius seems to have observed this fish. It is, how- 

 ever, unquestionably a species of Catostomus, allied to and perhaps even 

 identical with C. longirostris. The following is Tilesius's description 

 of this species, as quoted by Pallas : 



"Descriptio Cyprini rostrati Tungusis ad Covymam fluv.,Tschukulschan et Jucagins 

 Onatscha dicti. Tab. XV, Fig. 1-5. (Der Ruffelkarpfen, Eampkopf.) 



" Magnitude in adultis pedem superat, sed trium spithamarum longitudinem vix 

 attingit. Caput osseum longum antico rostro descendente truncatum e quino simile 

 quam ob rem Ruthenis. 



" Koub dicitur aliis Produst, quoniam os subtus, ut In (sic) Cotto cataphracto vel 

 Agono accipenserino, sed rictus oris vel orificium lunatum non amplum sed augustum 

 labiis crassis pinguibus marginatum, labium anterius fornicatum, ambitu semicirculare 

 ossibus labialibus vel mystaceis ad friBuum oris descendentibus arcuatis lateraliter 

 lectum, labium posterius minus, rectum, ab anteriori inclusum amplexuin papillis 

 numerosissimis granulatum. 



" Oculi lateralis a rostro remoli operculo posteriori branchiali approxiraati o vales, 

 iridibus aureis superne angustioribus, pupilla supra centrum posita. Nares ad mar- 

 ginem orbitae anteriorem dnplices ia sulco profundo osseo. Operculo branchialia tri- 

 lamellata, lamella anterior cum ossibus maxillso superioris conjuucta ellyptica angusta 

 ad orbitae marginem anteriorem ascendens inferius lamellaB sccundce tenerrimaB 

 angustiori orbitam inferiorem formanti imposita, lamina ossea subjacens, operculum 



