31. CYPRINID^ GILA. 
229 
tiou plain, darker above. Head d|; depth 4^. I). 0; A. 0; Lat. 1. 82. 
Eio Gila and Colorado Basin. 
(Ilaird & Girard, Proc. Acad. Nat. Sci. Pliila. 1853, 389; Girard, U. 8. Idex. Bound. 
Surv. Iclith. G1 : Lcudscus yrahumi Giiatlier, vii, 242: Ptychocheilus vorax Girard, Proc. 
Acad. Nat. Sci. Pliila. 185(5, 209, and U. S. Pac. R. R. Surv. x, 301. The type of 
“vorax'’ examined by us is a true Gila.) 
363. <4. afiiaiBS Abbott. 
A species allied to the preceding, described as follows : “ The body is 
slender, tail greatly attenuated, head constituting something more than 
one-tifth of the total length. Eye rather small, subelliittical, its diam- 
eter G4 times in the entire length of the head. The posterior extremity 
of the maxillary extends to a vertical line drawn posteriorly to the an- 
terior edge of the orbit. Anterior margin of the dorsal tin nearer the 
base of the caudal than the extremity of the snout. Anterior margins 
of the ventral fins somewhat nearer the extremity of the snout than the 
base of the caudal. The lateral line is nearly concurrent wdth the ven- 
tral outline. The numbers of the fin-rays are : D. 10 j P. IG ; V. 8 ; A. 
9;C. 28|-.” {Abbott.) Dull violet above, pinkish below. Kansas Eiver; 
Platte Eiver. (We have some time since examined specimens from 
Platte Eiver, and thought them distinct from G. robusta and G. graliawA, 
but having lost our notes are unable to add to Dr. Abbott’s account.) 
(Abbott, Proc. Acad. Nat. Sci. Pbila. 1860, 474.) 
363. G. gracilis Baird &, Girard. 
Body slender, the back not much elevated, the caudal peduncle not 
very slender, about twice as long as deep. Head large, its upper pro- 
file not very strongly concave. Mouth large, terminal and oblique, the 
upper jaw scarcely longer than the lower, maxillary reaching past the 
front of the eye. Interorbital space broad. Pectorals falling consid- 
erably short of ventrals. Caudal deeply forked. Dorsal well behind 
veutrals. Head 3^ 5 depth 4J. D. 9 5 A. 9 ; Lat. 1. 88 . Gila and Col- 
orado Eivers. 
(Baird & Girard, Proc. Acad. Nat. Sci. Pbila. 1853, 3G9 ; Girard, U. S. Pac. R. R. 
Surv. X, 287 : Lcudscus zumiensis Giiuther, vii, 241.) 
**IIead conical, scarcely depressed, the profile uot coucave. 
a. Belly scaled. 
364. G. cmos’ii Baird & Girard. 
Body slender, the back not notably arched. Caudal peduncle very 
slender, its least depth about one-fifth its length. Head rather small, 
conic, scarcely depressed above the eyes, its profile continuous with that 
