52 ZOOLOGY. 



27. PIMELODUS CATULUS, Grd. 

 GEN. REP. 208. PLATE XLI, FIGS. 46. 



SPEC, CHAR. Head very much depressed, constituting a little less than the fourth of the total length. Jaws equal ; mouth 

 of medium size. Eye rather small, sub-circular; its diameter entering about six and a half times in the length of the side of the 

 head, and four times over the interocular space. The base of the anal enters five times in the total length. Caudal posteriorly 

 sub-truncated, and constituting the sixth of the total length. Pectoral spines serrated upon their inner and outer aspects. 



926 and 927. Fort Smith, Arkansas. Dr. Geo. G. Shumard. 



28. PIMELODUS ANTONIENSIS, Grd. 

 GEN. REP. 209. 



SPEC. CHAR. Head quite depressed, nearly wedge-shaped, constituting about the fourth of the total length. Upper jaw 

 longest; mouth large. Eye small, sub- elliptical; its diameter entering about eight times in the length of the side of the head, 

 and somewhat over four times in the interocular space. Dorsal spine slender, slightly serrated posteriorly. Base of anal fin 

 somewhat longer than the head. Caudal fin posteriorly rounded, forming a little less than the sixth of the total length. Pectoral 

 spine serrated upon its inner edge. Reddish brown above ; whitish beneath. 



923. Near San Antonio, Texas, Dr. C. B. Kennerly. 



29. PIMELODUS FELINUS, Grd. 

 GEN. REP. 209. 



SPEC. CHAR. Head very much depressed, entering four and a half times in the total length. Mouth large ; jaws equal. Eye 

 moderate, sub-circular ; its diameter being comprised about six times in the length of the side of the head, and about thrice 

 on the intorocular space. Dorsal spine slender, posteriorly serrated. Base of anal fin entering four times and one-third in the 

 total length. Caudal rouuded off posteriorly, forming the sixth of the total length. Pectoral spines serrated upon their inner 

 and outer edges. 



924. Trib. of Gypsum creek, Canadian. H. B. Mbllhausen. 925. Coal creek, Arkansas. 

 II. B. Mollhausen. 



30. MOXOSTOMA CLAVIFORMIS, Grd. 

 GEN. REP. 219. PLATE XLYIII, FIGS. 59. 



SPEC. CHAR. Head constituting the fifth of the total length. Mouth rather small ; lips conspicuously plaited or ridged. Eye 

 moderate sized, circular ; its diameter contained about four times in the length of the side of the head. Anterior margin of dorse] 

 fin nearer the snout than the base of the caudal. Ventrals inserted opposite the fifth ray of the dorsal. Caudal fin posteriorly 

 concave. Anal fin narrow and deep. Scales much longer than deep, very much imbricated. Yellowish brown, rather dusky 

 along the dorsal region. 



165. Coal creek, tributary of South Fork of Canadian. II. B, Mollhausen. 



31. DIONDA PLUMBEA, Grd. 

 GEN. REP. 228. PLATE LII, FIGS. 2125. 



SPEC. CHAR - Body elongated, sub-fusiform, compressed. Head sub pyramidal, anteriorly blunt, constituting the fifth of the 

 total length. Gape of mouth slightly arched, its angle not extending as far as a vertical line drawn in front of the orbit. The 

 eye is large, sub-circular. The caudal fin enters about six times in the total length. Insertion of ventrals situated slightly back 

 wards of the anterior margin of the dorsal. Scales moderate sized, deeper than long. Greyish brown above ; whitish or 

 yellowish beneath, with a black spot at the base of the caudal. 



35. Head waters of Canadian river. H. B. Mollhausen. 



