Jordan aii({ /<'.7u-rniann. — Fishes of A^orl/i America. 211 



336. CHBOSOMUS OBEAS, 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. erythroijaster. Coloration 

 similar to that of Chrosomus cri/throtjaster, except for the difterenco 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 ; fins otherwise yellow. Length 21 inches. Head waters of 

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

 mountain streams. Specimens of erythi-Ofj aster approaching areas in 

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

 Alabama, {areas, opeidf, a mountain nymph.) 



Chrosn7nits areas, CoPE, Journ. Ac. Nat. Sci. Phila., 1868, 233. Head of Roanoke River, 

 Montgomery County, Virginia; (Coll. Cope) ; Jordan & Gilbeet, Synopsis, 154, 1883 ; 

 Jordan, Bull. U. S. Fisii Coiiim., viii, 1888, 121. 



io6. ALGANSEA. Girard. 



Algansea, GiRARD, Proc. Ac. Nat. Sci. Phila., 1850, ISi, {tincellu). 



This genus is very closely related to Hyhognathus, 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 Hyhognathus ; 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 in the lateral line; body and head robust. 



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



hb. Dorsal inserted rather before ventrals; maxillary reaching front of eye. di'GESI, 338. 

 aa. Scales moderate, 55 to 60 in the lateral line; eye small. salljei, 339. 



337. ALGAXSEA TIXCELLA (Cuvier k Valenciennes). 



HeadSf; depths^; scales 17-70-9; teeth 4-4. Body stoutish, the head 

 heavy. !Mouth moderate, obli(|uo, 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 o£ tinea, a tench.) 



Le«ci«c!ts tincella, Cuvier & Valenciennes, xvii, 323, 1844, City of Mexico; Guntiier, Cat., 

 vii, 244, 1868. (Specimens, No. 2753, U. S. N. M.; original typo in Museum of Paris. Coll. 

 Maj.Wm. Rich.) 



Leucus tincella, Jordan & Gilbert, Synopsis, 245, 1883. 



338. ALGAXSEA DUGESI, Bean. 



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

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

 4-f-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 



