FISHES OF THE COLORADO BASIN. 
483 
11. Gila robusta Baird A; Girard. 
Nominal siiecies. 
Locality. 
Collector. 
Authority. 
Baird Girard. 1853a, 
18535. 
Bo. 
Rio San Pedro, tributary of Rio Gila... 
Ptycliocheiliis vorax... 
Girard, 1856. 
Bo. 
Rio San Pedro, tributary of Rio Gila. . . 
John H. Clark 
Bo. 
Girard, 1856. 1858. 
Girard, 1858, 1859. 
Bo. 
Abbott, 1800. 
Gunther, 1868. 
Cope, 1871. 
Gila grahaini 
Rio San Pedro, tributary of Rio Gila... 
John H. Clark 
Leuciscus zunncnsift . . . 
Bo. 
1)0 
Bo. 
Bo 
Bo. 
do 
Bo 
Cope & Yarrow, 1870, 
Bo. 
Bo. 
Bo. 
Gila ii'rahauiii 
1)0 
do 
Loew, Heusliaw &. Rutter .. 
Bo. 
Bo. 
Bo 
Bo. 
Bo 
Be. 
Do. 
G'la robusta 
TJncompabc:re R., Belta, Colo 
Jordan, Evermann, Eesler 
Jordan, 1889. 
Bo 
Bavis. 
Bo. 
Bo 
Bo 
1895. 
Do. 
This species seems to he distributed throiighout the Colorado River Basin and is extremely vari- 
able. Compared with specimens from Salt River at Tempo, Ariz., ours from Green River difl'er in the 
obviously smaller eye and the possibly wider union of tlie gill-membranes with the isthmus. If, on 
further investigation, a northern form is found separalilo from the southern, it will bear the name 
nacrea Cope. The following is a detailed description of the six examples taken by us in Green River 
at Green River, Wyo., near the tyjie locality of Gila nacrea: 
Head,3fto4; depth, 4? to ; eye,3f to4; snout, 3Jto4; interorbital width, 2|; D.9orl0; A. 
9 or 10; scales, 23 to 25-85 to 103-13 or 14; teeth, 2, 5-4, 2, hooked, no grinding surface. Body 
moderately slender, head lu'oad, the upiier profile longitudinally and transversely convex; snout 
decurved; mouth oldique, jaws subequal, maxillary barely reaching beyond front of orbit, a.bout as 
long as from tip of snout to pupil; iiiterorbital .space very convex, 1-| times diameter of eye; back 
not strongly arched; caudal peduncle rather slender, compressed, the least deiJth 4 in head. Origin 
of dorsal beliind insertion of ventrals, midway l3etween nostrils and base of middle caudal rays;: 
anterior dorsal rays somewliat produced, their length If in head; anal smaller, length of longest 
ray in head, equal to length of pectoral; pectorals not quite reaching ventrals, the latter barely 
reaclnng vent. If in head; caudal widely forked, the lobes longer than head. Scales very small, 
crowded on back; lateral line strongly decurved. 
Two of these specimens, 3-4 and 4 inches long, respectively, differ from the others in having a 
shorter, blunter head, and a slightly deeper caudal peduncle. 
12. Gila seminuda Cope & Yarrow. Types taken in the Rio Virgeu, Washington, Utah, and 
described by Cope & Yarrow in 1876. 
13. Leuciscus lineatus (Girard). 
Kominal species. 
Locality. 
Collector, 
Authority. 
Hybopsis timpanogensis 
‘ Bo . . - 
Gunnison River 
Mr. Klett 
Co]>e, 1874. 
Cope & Yarrow, 1876. 
Do. 
Do. 
Do. 
Do. 
Do. 
Do. 
Bo 
Bo 
Colorado Chiquito River, Rew 
Mexico. 
Colorado Chiquito River 
Sibonia atraria longiceps 
Bo 
Br. Rewbeny 
