31. CYPRINID^E SQUALIUS. 235 



evenly forked. Pectorals short, not reaching nearly to veutrals; ven- 

 trals to vent. Dusky bluish; sides dark; a red spot at bases of ven- 

 trals and anal. Head 4; depth 4. D. 9; A. 8; scales 11-56-6; teeth 

 2, 5-4, 2. L. 6 inches. Utah Lake. 



(Jordau & Gilbert, Proc. IT. S. Nat. Mus. 1880, 4(51.) 



376. S. ardcsiacus (Cope) J. &, G. 



Body rather stout, compressed. Head heavy, muzzle short. Mouth 

 short, very oblique, the jaws about equal, the maxillary reaching past 

 the front of the large eye. Eye 4 in head. Pectoral fin long, nearly 

 reaching anal. Olivaceous above; a narrow dark lateral band, follow- 

 ing the direction of the back. Anal fin short. Head 3i; depth 4. 

 D. 8; A. 8; scales 17-63-8 ; teeth 2, 5-4, 2. L. 4 inches. Exact locality 

 unknown; probably Nevada. 



(Gila ardesiaca Cope, Zool. Wheeler's Expl. W. 100th Mer. v, G60.) 

 37"7. S. pandora, (Cope) J. & G. Chub ofthellio Grande; Pescadito. 



Body fusiform. Head small, broad and rather flat at the muzzle. 

 Jaws equal, maxillary not reaching line of orbit. Eye small, 6^ ill head. 

 Dorsal fin posterior. Silvery, darker above. A broad, ill -defined lateral 

 baud. Physiognomy of Ceratichthys rather than of JSqualius. Head 4; 

 depth 41 D. 8; A. 8; scales 17-01-0 (17-59-10 to 18-65-11); teeth 

 normally 2, 5-4, 2, sometimes 2, 4-4, 2, or even 1, 4-4, 1, in abnormal or 

 immature specimens; the second tooth sometimes with a small grinding 

 surface. L. 8 inches. Eio Grande region. "The most abundant fish 

 in New Mexico," and quite variable in characters usually very constant 

 among these fishes. 



(Clinostomus pandora Cope, Hayden's Geol. Surv. Moiit. 1871, 475.) 



378. S. margaritus (Cope) J. & G. 



Body stout and thick, little compressed, the back somewhat elevated. 

 Caudal peduncle thick. Head blunt, thick and rounded. Mouth small, 

 terminal, oblique, the upper lip below the orbit, the maxillary not reach- 

 ing the line of the orbit. Eye rather large. Scales rather small. Lat- 

 eral line decurved. Fins rather large. Dorsal fin posterior. Colora- 

 tion above dusky olive; sides plumbeous silvery; belly white, crimson 

 in spring males; snout dusky; fins plain; scales punctate. Head 4; 

 depth 4. D. 8; A. 8; scales 11-58-8; teeth 2, 5-4, 2. L. 3 inches. 

 Susquehauna Eiver. A handsome fish, quite unlike any other American 

 species, resembling most Phoxinus neogcvus. 



(Clinostomus maryarita Cope, Cypr. Penii. 1866, 377: Leuciscus maryarita GUnther, 

 vii, 246.) 



