I 



PEOCEEDIXGS OF UNITED STATES NATIONAL MUSEOI. 203 



24. Rhinichthys atronasus Mitch. 

 Xot often seen. 



25. Nocomis bieuttatus Kirt. 



Occasional. 



26. Nocomis amblops Eaf. 

 Abundant. 



27. Nocomis hyostomus sp. nov. (34980.) 



Body very slender, terete, little compressed, not heavy forwards, reg- 

 ularly tapering from the shoulders. Caudal peduncle very slender. 

 Head slender: snout long, conic, rather .sharp, 2f in length of head, 

 projecting beyond mouth for a distance about equal to half its length 

 from eye. [Mouth inferior, horizontal, with short, wide gape, broad^ 

 rounded anteriorly: lips not thickened: maxillary extending slightly 

 beyond vertical from front of eye. 3f in head. Barbel long, conspicu- 

 ous, thickened at base, its length about three-tifths diameter of eye. 

 Eye small, in middle of length of head, very elliptical in shape, its ver- 

 tical diameter equaling iuterorbital width and distance of nostril from 

 tip of snout, 4 in head : longitudinal diameter of orbit % in head. Oper- 

 cle small, its length longitudinally less greatest width of cheeks. . 



Teeth 4-4. stronglv hooked, without trace of grindinor surface. 



Dorsal and anal rather small, not falcate, the origin of dorsal very 

 slightly behind insertion of ventrals, midway between snout and base 

 of caudal. Pectorals large and prominent, the insertion more nearly 

 horizontal than usual in the Cy]irinidie. Longest dorsal ray 1^ in head : 

 jiectorals IJ: caudal slightly less than head: ventrals reaching vent. 



Scales large. 37 in lateral line, and 13 or 14 before dorsal. The scales 

 are slightly crowded towards head, the series not converging towards 

 back. Lateral line straight, or almost imperceptibly decurved ante- 

 riorly. 



Head (oi to) 4 in length : depth o^ to of; D. S. A. 8. L. 2 to 2^ inches. 



Color in life: Back light greenish, perfectly translucent: a silvery 

 streak along lateral line with ill detined edges, widest forwards: body 

 below whitish. Scales above minutelv and evenlv dusted with dark 

 points: top of head with black areas: middle of sides of head and body 

 thickly covered with black specks, which do not form a distinct dark 

 lateral streak, as in 3'. amhlops. Fins translucent : base of dorsal some- 

 what dusky: black points at bases of anterior anal rays. 



All specimens examined have back and sides with scattere<l black 

 parasitic specks of varying size. 



Verv abundant in White Eiver. near Bedford. Lawrence County, 

 Indiana. 



28. Semotilus corporalis Mitch. 



