[29] CATALOGUE OF THE FISHES OF NORTH AMERICA. 



331. Hybopsis amblops Rafinesqne. Vw. (331) 

 331b. Hiiboimx amhlopH rubri/rons Jordan. Vse. (332) 



332. Hybopsis hypsinotus Cope. Vse. (333) 



$ Erinemus Jordan. 



333. Hybopsis dissimilis Kirtlaud. Vn. (334) 

 334 Hybopsis monachus Cope. Vs. (340) 



335. Hybopsis zanemus Jordan & Brayton. Vse. (339) 



336. Hybopsis labrosus Cope. Vse. (338) 



337. Hybopsis hyostomus ' Gilbert. Vw. 



338. Hybopsis montanus- Meek. Vw. 



339. Hybopsis marconis ' Jord a n & Gilbert. Vsw. 



340. Hybopsis aestivalis'' Girard. Vsw. (335,336) 



341. Hybopsis gelidus ' Girard. Vnw. (.337) 



88.— COUESIUS Jordan. (93) 



342. Couesius squamilentus Cope. Vnw. (341) 



343. Couesius dissimilis'' Girard. Vnw. (342.) 



344. Couesius plumbeus" Aga.saiz. Vii. (343) 



345. Couesius physignathus Cope. Vnw. (344) 



89.— PliATYGOBIO Gill. 



346. Platygobio gracilis'* Richardson. Vnw. (345,346) 



90.— SEMOTILUS Rntinesque. (95) 



347. Semotilus atromaculatus' Mitcbill. V. (347) 



348. Semotilus thoreauianua Jordan. Vs. (348) 



349. Semotilus bullaris Rafinesque. Vne. (349) 



' Xocomis hyostomus Gilbert, Proc. U. S. Nat. Mus, 1884, 203. Indiana, Iowa, to Ten- 

 nessee ; not rare in river cliannels. 



- Hybopsis montanus Meek, Proc. U. S. Nat. Mus, 1884. Upper Missouri region. 



^ Hybopsis marconis Jordan & Gilbert, Proc. U. S. Nat. Mus., 1885. Rio San Mar- 

 cos, Texas. 



* Gob'io mstivalis Givard = Ceratichthys sterletus Cope. This species is allied to H. 

 hyostomus, but has a much smaller eye ; 4 to 4^ in head. 



^Hybopsis gelidus is very pale in color, nearly or quite immaculate. The lower lobe 

 of the caudal is dusky ; the eye is small, 4 in head; and the scales are smaller than 

 in related species, there being 44 in the lateral line. The barbel in these small fishes 

 {H. gelidus; osstivalis ; hyostomus; zanemus; montanus; marconis,) is much more de- 

 veloped than in any other of the American Cyprinidce. 



"The description in the Synopsis, of Cowesi us dissmi/is is somewhat confused with 

 that of C. plumbeus. 



From the latter species C. dissimilis differs in the larger scales (60 instead of 68), the 

 more decurved lateral line, and the more robust body. Mouth oblique, subterminal, 

 resembling that of Semotilus. It is thus far known only from the Upper Missouri re- 

 gion. 



'' Crobio plumbeus Agassiz^= Nocomis milneri Jordan=Ceratichthys prosihemius Cope. 

 Adirondack region, northwest to Manitoba. 



^I am unable to distinguish Platygobio palUdus, by the description, from Plafygobio 

 gracilis. 



^The original Cyprinus corporalis of Mitchill is Semotilus bullaris. This species must 

 therefore stand as Semotilus atromaculatus. 



