314 Bulletin 4^, United States National Museum. 



the longer; maxillary reaching about Hue of orbit; mouth forming more 

 than a semicircle. Fins long, the ventrals reaching anal. Color, dark iron 

 gray above, sometimes spotted ; a darker band of same along sides above 

 lateral line, extending from end of snout to middle of caudal where it 

 is most conspicuous; males with the belly yellow or orange. Tributaries 

 of the Gila River, not rare in mountain brooks. (;t;piiffof, gold; yaarf/p, 

 belly.) 



Agosia chrt/sogaster, Girard, Proc Ac. Nat. Sci. Phila., 1850, 187, and U. S. & Mex. Bound. 



Surv., Zoiil., 40, plate xxviii, figs. 5 to 8, 1859, Rio Santa Cruz, Sonora. (Coll. Clark.) 



Jordan & Gilbert, Synopsis, 209, 1883. 

 Agnsia mehillica, GiuARn, Proc. Ac. Nat. Sci. Phila., 1856, 187, and U. S. & Mex. Bound. Surv., 



Zo'6\., 49, plate XXVIII, figs. 1 to 4, 1859, Rio San Pedro, Arizona. (Coll. Clark.) Jor- 

 dan & Gilbert, Synopsis, 209, 188.5. 

 Hiiborhynclms siileriitK* (lapsus for Tfijhngnalhus), Cope, Zoiil. Wheeler Surv., v, 670, plate xxxi, 



figs. 6, Cia, 1875, (1K76), Camp Lowell, Arizona. (Type, No. 16984. Coll. Ruttar.) 

 Zophendum siderium, Jordan & Gilbert, Synopsis, 155, 1883. 



130. HYBOPSIS, Agassiz. 

 (Horny-heads.) 



Hybopsis, Agassiz, Amer. Journ. Sci. Arts, 1854, 358, {gracilis = amhIops'). 



Nocmnis, Girard, Proc. Ac. Nat. Sci. Phila., 1850, 190, {nehrasceusis=^lcenlncMetuis). 



CeralicMhys, Baird MS., Girard, Proc. Ac. Nat. Sci. Phila., 1850, 212, {l>ignUahts = ]cmtticJciensis). 



Erinemns, Jordan, Man. Vert., Ed. i, 279, 1876, {liyalinns = amblops). 



Erimystax, Jordan, Geol. Surv. Ohio, iv, Zool., 858, 1882, {dissimilis). 



Tuririti, Jordan & Evermann, now subgenus, (alius). 



Body robust, or variously elongate. Mouth terminal or inferior, with 

 lips thin or somewhat fleshy, a conspicuous barbel always present and 

 terminalon the maxillary ; a second barbel sometimes present on each side; 

 premaxillaries protractile. Teeth 4-4, or 1, 4-4, 1, or ; hooked, the grind- 

 ing surface narrow or obsolete. Scales usually rather large, 35 to 58 in 

 lateral line ; lateral line continuous. Dorsal fin inserted over, in front of, 

 or slightly behind ventrals ; anal basis short. Males usually with nup- 

 tial tubercles, and sometimes flushed with red. A large and varied group, 

 closely allied to Nott-ojyiff, from which it diffiers chiefly in the presence of 

 the small maxillary barbel. We here divide it into 4 subgenera, but a 

 greater number of subordinate groups coitld be recognized. The group 

 shows a range of variation as wide as that in Notrojris, though with a 

 smaller number of species, (i'/ioi, gibbous ; bxpig, face.) 



a. Species of moderate orsmall size, the mouth inferior, horizontal ; preorbital liroad, silvery; 

 sexes similar, the male sometimes tuberculate or with the fins rosy. 

 Erimystax, (e'pi, an intensive particle ; fiv';Ta^, liarbel or moustache) : 

 b. Teeth one-rowed, 4-4 ; lips thickish ; body long and low, with the aspect of Gobio or 

 Phenacobitis. 

 e. Teeth without grinding surface ; sides not marked by a series of dark blotches con- 

 nected by a lateral band ; eye moderate, 3J^ to 5J^ in head. 

 d. Scales r.ather large, 35 to 44 in the lateral line ; barbel very long, sometimes 

 duplicated ; dorsal fin without black blotch on its upper posterior por- 

 tion ; suout projecting ; body slender; fins high. 



* lu the type of II. sideriwi the barbel is plainly evident, a fact which Mr, Barton A. Bean has 



recently kiudly verified for us. 



