234 Bulletin ^7, United States National Museum. 



Coloratiou dusky abovt^; silvi^ry below; males with the axil red; sides 

 with a vague dnsky baud; young with a black caudal spot. Length 6 to 

 12 inches. Rio Giando 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 i. pandora ; further south the species 

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

 are the same species. {ni<jrescens, blackish.) 



Gila pttlchella, Baird & Girard, Proc. Ac. Nat. Sci. Phila., 18.'J4, 29, Rio Mimbres, Lake Guz- 

 man, Chihuahua; scales G6; teoth 2, 5-4, 2; not Leucu^cns pulcheUits, Storer. (Type, No. 

 233. Coll. Clark.) 



Tigoma juV/i-escois, CJirard, Proc. Ac. Nat. Sci. Phila., 1856, 207, Boca Grande and Rio Janos, 

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



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

 1, without grinding surface; scales 13-C7-7; color bright. (Type, Nos. 227 and 228 (2782). 

 Coll. Potts); Girard, IT. .'!. Me.\. Bound. Surv., Ichtli., 05, 1859. 



Clino»lnmiix pandora. Cope, Ilaydeu's Geol. Surv. Mont, for 1871, 475, 1872, Tributaries Rio 

 Grande, Sangre de Cristo Pass; scales 17-59-10 to 18-05-11; teeth 1, 4-4, 1 to 2, 4-5, 2, 

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

 Cope, Aiken, Yarrow.) 



Gila gida, Oopr., ZoLil. Wlieeler's Expl. W. 100th Mer., v, 661, 1875, (1870), 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. Ilenshaw.) 



Clieondn modexia, Gauman, Bull. Mus. Comp. Zoiil., viii, 92, 1881, Rio Salinas, Sattillo, 

 Coahuila; scales 14-65-9; Lead 3'^; depth 3%. 



Tigoma conspersa,* Gauman, Bull. Mus. Comp. Zool., viii, 92, 1881, Rio Nazas, Coahuila. 



SqnaUu!! pandora, Jordan & Gilbert, Synopsis, 235, 1883. 



Sqiialivsgida, .Jordan & Gilbert, Synopsis, 230, 1883. 



Sqitalitis pnJcher and ptdcheUiin, Jordan & Gilbert, .'Synopsis, 236, 238, 1883. 



S(ptalius cotispersns, Jordan & Gilbert, Synopsis, 239, 1883. 



SquttUiis nigresceihi, .Jordan & Gilbert, Synopsis, 242, 1883; scales 10-70-10; teeth 2,4, with grind- 

 ing surface. 



Bqualivs modesttit, Jordan & Gilbert, Synopsis, 242, 1883. 



368. LEUCISCUS PITRPUREUS (Girard). 



Head 3i; depth 3|. 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 nUircscens may 

 prove indistinguishable ivovupurpureus, and very likely n'ujer also may be 

 the same. In view, however, of the general difference in the fauna* of 

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

 (purjmreun, purple.) 



Tigoma purpurea, GiRARD, Proc. Ac. N.-it. Sci. Phila., 1850, 200, San Bernardino Creek, Ari- 

 zona. (Coll. Kennerly.) 

 Sijitaliux jmrpurem, Jordan & Gilbert, Synopsis, 238, 1883. 



* Tigoma corutpersa. Form of Leucisrnxniger. — 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 tlirei-fdurtlis distance to ventrals, which reach vent. Brown above; scales of 

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

 tributary of Laguua del Muerte. 



