Jordan and Krermiiun. Fishes of North America. L'l 1 



336. I'HROSOMUS OREAS, Cope. 



Head 4 ; depth 4J. D. 8 ; A. 8. Lateral line 67 ; teeth 5-5. Snout, pre- 

 orbital, and maxillary a little longer than in C. erythrogaster. Coloration 

 similar to that of Chrosomits crytkrogftfter, except for the difference in pat- 

 tern, the upper band beginning opposite the vent and extending back- 

 ward to middle of caudal, ending in a black spot; lower band extending 

 from snout through eye downward and backward, ceasing at base of 

 anal; back clear olive-green, with dark spots and crossbars; belly, 

 interspace between the lateral bands, and bases of vertical fins bright 

 crimson ; tins otherwise yellow. Length 2| inches. Head waters of 

 Roanoke River. The most brilliant of the genus, locally abundant in 

 mountain streams. Specimens of erythroyaster approaching oreas in 

 coloration are also found in clear tributaries of the Tennessee River, in 

 Alabama, (oreas, opemf, a mountain nymph.) 



<'hrs<,,ni<* nreas, COPE, Journ. Ac. Nat. Sci. Phila., 1868, 233. Head of Roanoke River, 

 Montgomery County, Virginia; (Coll. Cope); JORDAN & GILBERT, Synopsis, 154, 1883; 

 JORDAN, Bull. U. S. Fish Coinm., vin, 1888, 121. 



106. ALGANSEA, Girard. 



Algansea, GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 184, (tincella). 



This genus is very closely related to Hybognathus, differing chiefly in 

 the small size of the scales, there being 55 to 70 in the course of the 

 lateral line; preorbital bones very wide, as in Hybognathus ; teeth 4-4, 

 scarcely hooked, with rather broad grinding surface ; intestinal canal 

 elongate; peritoneum black. Mountains of Mexico. (A coined name.) 

 a. Scales very small, about 70 iu the lateral line; body and head robust. 



6. Dorsal inserted over ventrals; maxillary not reaching eye. TINCELLA, 337. 



bb. Dorsal inserted rather before ventrals; maxillary reaching front of eye. DUQESI, 338. 



a. Scales moderate, 55 to 60 in the lateral line; eye small. SALLF.I, 339. 



337. ALGANSEA TINCELLA (Cuvier & Valenciennes). 



Head 3f ; depth 33 ; scales 17-70-9; teeth 4-4. Body stoutish, the head 

 heavy. Mouth moderate, oblique, the maxillary not reaching to the eye ; 

 jaws about equal; eye rather small; fins small, the caudal short. 

 Dorsal inserted just over ventrals. Scales quite small, firmly attached 

 and not closely imbricated, as in Mylocheilus and Gila. Coloration dark, 

 plain; fins unspotted. Length 6 inches. Lakes about the City of 

 Mexico, (diminutive of tinea, a tench.) 



Leuciscus tincella, CUVIER & VALENCIENNES, xvn, 323, 1844, City of Mexico; GPNTHER, Cat., 

 vn, 244, 1868. (Specimens, No. 2753, U. S. N. M.; original type in Museum of Pane. Coll. 

 Maj.Wm. Rich.) 



Leucus tincella, JORDAN & GILBERT, Synopsis, 245, 1883. 



338. ALGANSEA DUGESI, Bean. 



Head 4; depth 4; eye 5|. D. 7; A. 6; scales 18-69 to 72-13. Teeth 

 4-4, slightly hooked, with well-developed grinding surface. Gill rakers 

 4+15. Body robust. Lower jaw slightly included, with a small knob at 

 the symphysis; maxillary reaching opposite front of eye. Dorsal 

 inserted somewhat before ventrals at a point midway between snout and 

 base of caudal; lower fins short; caudal large. Scales very small and 

 crowded anteriorly, larger behind; lateral line sharply decurved over 

 pectoral. Dusky brown ; sides of head silvery, a very faint dusky spot at 



