Jordan and Evermann. — Fishes of North America, 305 



anterior, the maxillary uot reaching to eye ; premaxillary protractile, but 

 not much movable; lips somewhat thickened ; scales very small, those on 

 belly and before dorsal minute ; lateral lino complete, decurved anteriorly ; 

 fins all very small, the dorsal slightly behind ventrals, its tip uot pointed; 

 pectorals short, reaching about half way to anal. Olivaceous, belly sil- 

 very, sides with a rather faint plumbeous lateral baud ending in a small 

 black caudal spot; a darker dorsal stripe; fins all pale. Length 3 inches. 

 City of Mexico ; here described from one of Mr. Woolman's types. (Named 

 for Dr. Carl H. Eigenmanu.) 



EtiarraeiV/eiimaimi, WooLMAN, BuU. U. S. Fish Comm., xiv, 189i, May 3, 1894, 04, City of Mexico. 

 (Type, No. 45571. Coll. Woolman & Cox.) 



127. TIAROGA, Girard. 



IVorofl'a, GiRARD, Proc. Ac. Nat.Sci. Phila., 1856,204, (cobj'(is). 



Body decidedly elongate, having the form of a loach {Cobitis), subfusi- 

 form, little compressed and covered with minute scales. Lateral line 

 complete. Head small, subconical, depressed, the mouth very small, ter- 

 minal, oblique, without barbels, the lips fleshy and the premaxillary not 

 protractile. Eye moderate. Isthmus very wide. Dorsal inserted slightly 

 behind ventrals, the fin high, its first rudimentary ray somewhat enlarged; 

 anal with short base. Teeth very small, apparently 1,4-4, 1, and without 

 grinding surface. One species known, a very singular little fish from the 

 Gila region- (A coined name.) 



506. TIAROCIA COBITIS, Girard. 

 Head 4f ; depth 6; eye 31. D. 8; A. 7; lateral line 65. Teeth without 

 grinding surface, 1, 4-4, 1.* Maxillary falling far short of eye, 4 in head; 

 lower jaw included. Eye moderate, high up, midway in head; isthmus 

 very wide. Lateral line nearly straight. Body olivaceous, with dusky 

 specks above ; a black spot at base of caudal. Length 2i inches. Rio 

 San Pedro, a tributary of Rio Gila; only the types yet known, {cohitis, 

 the loach, a European fish of similar form.) 



Tiaroga cohiik, GiRARD, Proc. Ac. Nat. Sci. Phila., 1S5C, 204, Rio San Pedro, Arizona. 



(Coll. Clark.) Girard, U. S. Hex. Bound. Surv., Ichth., 60, 1859. 

 Leuehws cuhilis, Gunther, Cat., vii, 247, 1868. 

 diolacohilis, Jordan & Gilbert, Synopsis, 170, 1883. 

 Tiaroga colitis, Jordan, Proc. U. S. Nat. Mus., 1885,120. 



128, RHINICHTHYS, Agassiz. 

 (Black-nosed Dace.) 



Argyrms, Heckel, Russeggers Reisen, I, 1040, 1843, (atronasus), name preoccupied in Entomology. 

 Hhinichthysi, Aq.\ssiz, Lake Superior, 35;i, 1850, [almnasits). 



Body rather elongate, not much compressed. Mouth small, subinferior, 

 the upper jaw not jirotractile, the upper lip continuous with the skin of 

 the forehead, forming a very broad frenum ; a small or minute barbel ter- 

 minal on the maxillary. Teeth mostly 2, 4-4, 2 or 1, hooked, without grind- 

 ing surface. Intestinal canal short. Scales very small ; lateral line con- 

 tinuous. Dorsal fin inserted behind the ventrals. Anal basis short. 



*Not 1, 3-3, 1, as stated by Girard. 

 F. N. A. 21 



