234 Bulletin 47, United States National Museum. 



Coloration dusky above; silvery below; males with the axil red; sides 

 with a vague dusky band; young with a black caudal spot. Length 6 to 

 12 inches, Rio Grande Basin, from San Luis Park to Mexico, everywhere 

 abundant in eddies and deep places in the river. Variable, the dentition 

 especially so. The present description from specimens taken in the Rio 

 Grande at Alamosa, corresponding to L. pandora', further south the species 

 grows larger with the back higher, the head more depressed. Probably all 

 are the same species, (nigrescens, blackish.) 



Gila pulchella, BAIED & GIRARD, Proc. Ac. Nat. Sci. Phila., 1854, 29, Rio Mimbres, Lake Guz- 

 man, Chihuahua; scales 66; teeth 2, 5-4, 2; not Leuciscus pulchellus, STOKER. (Type, No. 

 233. Coll. Clark.) 



Tigoma nigrescens, GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 207, Boca Grande and Rio Janos, 

 Chihuahua. (Type, No. 219. Coll. Kennerly.) 



Tigoma pulchra, GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 207, Chihuahua River: teeth 1, 4-4, 

 1, without grinding surface; scales 13-67-7; color bright. (Type, Nos. 227 and 228 (2782). 

 Coll. Potts); GIRARD, U. S. Mex. Bound. Surv., Ichth., 65, 1859. 



Clinostomus pandora, COPE, Hayden's Geol. Surv. Mont, for 1871,475, 1872, Tributaries Rio 

 Grande, Sangre de Cristo Pass; scales 17-59-10 to 18-65-11; teeth 1, 4-4, 1 to 2, 4-5, 2, 

 with or without grinding surface. (Type, Nos. 15761, 15984, 15985, 15987, and 18000. Coll. 

 Cope, Aiken, Yarrow.) 



Gila gula, COPE, Zool. Wheeler's Expl. W. 100th Mer., v, 661, 1875, (1876), Rio de Acama, and 

 near Fort Wingate, New Mexico; large specimens with the scales 16-60-11, and the 

 mouth large; the teeth 2, 5-4, 2. (Type, No. 16979. Coll. Henshaw.) 



Cheonda modesta, GARMAN, Bull. Mus. Comp. Zool., vnr, 92, 1881, Rio Salinas, Saltillo, 

 Coahuila; scales 14-65-9; head 3*^; depth 3%. 



Tigoma conspersa,* GARMAN, Bull. Mus. Comp. Zool., vin, 92, 1881, Rio Nazas, Coahuila. 



Squalius pandora, JORDAN & GILBERT, Synopsis, 235, 1883. 



Squalius gula, JORDAN & GILBERT, Synopsis, 236, 1883. 



Squalius pulcher and pulchellm, JORDAN & GILBERT, Synopsis, 236, 238, 1883. 



Squalius conspersus, JORDAN & GILBERT, Synopsis, 239, 1883. 



Squalius nigrescens, JORDAN & GILBERT, Synopsis, 242, 1883; scales 16-70-10; teeth 2,4, with grind- 

 ing surface. 



Squalius modestus, JORDAN & GILBERT, Synopsis, 242, 1883. 



368. LEUCISCUS PURPUREUS (Girard). 



Head 31; depth 3f. A. 8; scales 13-62-8; teeth 1, 4-?, ?. Stout and com- 

 pressed; head long. Lateral line decurved. Dorsal fin slightly behind 

 ventrals. Fins all small. Blackish above, pale below. San Bernardino 

 Creek in southern Arizona, a tributary of Rio Yaqui. Only known from 

 Girard's type. It is not impossible that both intermedius and nigrescens may 

 prove indistinguishable from purpureus, and very likely niger also may be 

 the same. In view, however, of the general difference in the faunae of 

 the Rio Grande, Yaqui, and Gila, we admit the three species as distinct. 

 (purpureus, purple.) 



Tigoma purpurea, GIRARD, Proc. Ac. Nat.'Sci. Phila., 1856, 206, San Bernardino Creek, Ari- 

 zona. (Coll. Kennerly.) 

 Squalius purpurem, JORDAN & GILBERT, Synopsis, 238, 1883. 



*Tigoma conspersa. Form of Leuciscus niger. Head 3% ; depth 3%. I). 8 ; A. 8 ; "teeth 4, 1-1, 

 4, clawed;" scales 13-69-9. Profile of head concave, maxillary reaching front of orbit. Pector- 

 als extending three-fourths distance to ventrals, which reach vent. Brown above; scales of 

 back and sides speckled with darker ; an obscure dusky lateral shade. Rio Nazas, Coahuila, a 

 tributary of Laguna del Muerte. 



