174 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



body. It is said to be very iibuiulaiit in Laico Talioe. "They are caught 

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

 poor as loud'' (Cooper). Acomiis gcnerosus of Girard, with which this 

 species has been ideutitied, is a very diflereut species, belonging to a 

 dilierent genus. 



Sjaeciviens in United States Xatwr.al Museum. 



NirnlnT. 



Locality. 



C'olli'ftor. 



5240 

 17109 



Lake Tahoe (types C. tahoensis) 

 Lake Taboo 



J. G. Cooper. 

 H. W. Ileiishaw, 



33. CATOSTOMUS ROSTKATUS {Tilesiiis) Jordan. 



Siberian Sucker. ^ 

 1813 — " Cyprinus roxiratus Tilesius, M6m. Ac. Sc. St. P^tersbourg, iv, p. 454, tab. 15, 

 figs. 1-2, 181:}." 

 Cyprinus roatratus Pali.as, Zoogr. Rosso- Asiat. iii. 308. 



Cyprius rostratus -OUnther, Cat. Fishes Brit. Mus. xii, 12, 1868. (As doubtful 

 species of Calostomus.) 

 1844 — Caiostomua tilesii Cuvikr & Valenciennes, Hist. Nat. des Poissons, xvii, 4G9, 

 1844. 



Haiutat. — Eastern Siberia. 



No writer vsince 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 iollowing is Tilesius's description 

 of this species, as quoted^by Pallas : — 



" Descriptio Cyprini rontrati Tungusis ad Covymani fliiv..Tscbuknlscbaa et Jiicagins 

 Onatscha dicti. Tab.XV, Fig. 1-.5. {Der liuffclkarpfen, Eampkopf.) 



'' Magnitiido in adultis pedem snperat, sed trium spitharnarniu longitndinem vix 

 attingit. Caput osseum longiim antico rostro descendente trnncatum e (piiuo simile 

 quam ob rem Rntbonis. 



" Koub dieitur aliis Prodnsf, qnoniam os snbtus, iit In (sir) Cotto catapbrarto val 

 Agono accipenserino, sed rictus oris vol orificium lunatum non ainplnm sed angustum 

 labiis cra.Hsia pinguibns marginatum, labium anterins fornicatum. ambitusemieircularo 

 ossibus laliialibus vel mystaceis ad fncnum oris de8cendentil)us urcuatis lateraliter 

 tectum, labium posterius minus, rectum, ab anterior! inclnsiini anipltxnm itapillis 

 Damerosit<simis granulatnm. 



** Oculi lateralis a rostro renioli operenlo posteriori brancbiali ajiproximati ovales, 

 iridibuH aurt is superne angustiorilms, pupilla supra centrum posita. XariH ad mar- 

 giucm orbitai anteriorem <luplices in sulro profundo osseo. Opcrculo branchialia tri- 

 lamellata, lamrUa anterior cum ossiltns maxillic superioris conjuucta ellyptica angusta 

 ad orbific marginem anteriorem ascendens inferins lamel'.ai sccnnda' tenerrimaj 

 angustiori orbitam inferiorem fi>rniniiti imposita, lamina ossea sutyaccns, operculum 



