MUSEUM OF COMPARATIVE ZOOLOGY. 87 



Lips with less development than is common in the genus, upper not separated 

 by a fold in front. Barbel short, passed by a vertical from the posterior margin 

 of the nasal cavity. Anterior margin of orbit and base of caudal equidistant 

 from the first ray of the dorsal, a vertical from which passes near the middle 

 base of the ventral. Caudal moderately notched, peduncle st<jut. 



Dotted and blotched with black upon a silvery ground ; belly plain silvery 

 white to cream color, or to orange in life. Crown of head darker. Lower half 

 of cheek silvery. 



Young with a dark band on each side from the end of the snout, through 

 the eye, to the base of the caudaL Described from the type specimens. Bur- 

 lington, Iowa. 



Rhinichthys arenatus sp. nov. 



D. 2+8 ; A. 2-f 7 ; V. 1 + 9 ; P. 14; L. long. 63-66; L. trans. 9 + 1 + 

 7 (7-8). 



Teeth 4.1 — 1.4. 



A small species of the R. meleagris type. 



Head four and one fourth and depth five and one half times in the total, 

 without caudal. Eye moderate, diameter of orbit one and one half times in 

 either length of snout or interorbital space, and about four and one half times 

 in the length of the head. Mouth slightly oblique. Jaws about equal. Max- 

 illary reaching about half-way from the end of the snout to the eye. Upper 

 lip not separated by a fold in front. The lips are not very thick, and the 

 mouth is scarcely to be called inferior, the snout has so little prominence. 

 Barbel conspicuous, short. First ray of the dorsal behind a vertical from the 

 base of the ventrals. 



Light reddish bro^vn, blotched and clouded by darker. Top of head and an 

 irregular, darkly defined line, from the end of the snout through the eye along 

 each flank to the base of the caudal, dark. Belly light ; lower half of flank 

 and cheek silvery. 



Sand HiU Eiver, North Minnesota. Collected by S. H. Scudder, Esq. 



Rhinichthys luteus sp. nov. 



D. 2 + 8 (8-9) ; A. 2 + 7 (7-8) ; V. 8 ; P. 14 ; L. Ion. 68 (68-75) ; L. trans. 

 10 + 1 -f 10. 



Teeth 4.2 — 2.4, uncinate. 



Head one fourth and depth one sixth of total, without caudaL Eye small, 

 diameter of orbit twice in length of snout, about five times in length of head, 

 and one and one half times in the width of the head between the eyes. Muzzle 

 prominent, obtuse, extending considerably beyond the mouth. Barbel in 

 advance of the eye. Mouth comparatively short and broad. First ray of 

 dorsal midway between nostrils and base of caudal ; a vertical from this ray 

 touches the hinder extremity of the base of the ventral Ventrals reaching 



