20 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
jarrovii, from the Eio Grande. The original Minomus jarrovii of Cope is from Provo, 
Utah, and is the species described by Girard as Acomus generosus, and by Cope as 
Minomus platyrhynclms. The original Cafostomus guzmaniensis and the original Catos 
tomus plcheius are from Lake Guzman, in Chihuahua, a lake without outlet, but be- 
longing to the Eio Grande Basin. 
Among the many specimens of Pantostetis examined by us we recognize three 
species, each one, so far as our own collections show, confined to a distinct river basin. 
The following analysis shows the principal characters of each of these : 
a. Scales moderate, 80 to 90 in the lateral line, 28 to 30 in a cross series between dorsal and ventral ; 
mouth and lips of moderate size ; dorsal rays usually 9. 
7). Head comparatively short and small, 4f to 5 in length of body ; body slender, the depth 5 to 5f 
in length ; 45 to 50 scales before the dorsal ; scales 15-18-14. Great Basin of Utah (gener- 
osus GiTa,Td= 2 )latyrhi/nclms Co]}6=jarrovii Cope) Generosus. 
hi). Head comparatively large, 4f to 4f in body ; body more robust, the depth 4| ; dorsal fin a little 
higher and pectoral a little longer. Rio Grande Basin a.ud Lakes of Chihuahua (pZc&eiits 
Baird and Girard= ? guzmaniensis GiTiiTd=jarrovii Yarrow, not of Cope) Pleheius. 
aa. Scales very small, 95 to 103 in the lateral line ; 20 to 33 in a cross series between dorsal and ventral ; 
mouth large, with very full lips; head rather short, 4f to 4f in leugth; tail very slender, 
the caudal long ; 50 scales before dorsal ; depth of body about 5 in length ; scales 16-96 to 
99-14. Basin of Colorado JiiveT (delphintis Cope = ? hardus Cov& = rirescens Cone = guz- 
maniensis Jordan Cat. Fish.N. A., 1885, probably not of Girard) Delgpliimis. 
These three species are certaiuly distiuct from each other and are very common, 
each in its respective hydrographic basin. If other species exist they are unknown 
to us. 
2. Leuciscus pulcher (Girard). C., A., D. 
(Gila pulchella Baird & Girard, Proc. Ac. Hat. Sci. Phila., 1854, 29, Eio Mimbres, 
Lake Guzman, Chihuahua, not Leuciscus pulcliellus Storer; Tigoma pulchra Girard, 
Proc. Ac. Nat. Phila., 1856, 207, Chihuahua E.; Clinostomus pandora Cope, Hayden’s 
Geol. Survey Montana for 1871, 475, 1872, Eio Grande in New Mexico.) 
The ehub or “Pescadito” is everywhere abundant, reaching a length of 6 or 8 
inches. It is found in eddies and deep places with the preceding species. The syn- 
onymy of the species is given above. There seems to be little room for doubting the 
identity of pulcliella, pulchra, and pandora, and no other species of this genus has yet 
been authentically recorded from the basin of the Eio Grande. The earliest name, 
pulcliellus, is preoccui)ied in the genus Leuciscus. 
Head 4i in length ; depth 4| ; scales 15-67-10 ; axils red in the male. Teeth often 
irregular in number, sometimes 1, 4-4, 1. 
NOTE ON THE GENERIC NAME LEUCISCUS. 
For a number of years American writers have referred our species with the teeth 1 
or 2, 4-5, 2, and with hooked tips, to the genus Squalius Bonaparte. 
Comparing the American species with the European representatives of this type, 
we find that while there is a general agreement in technical characters the European 
species have much larger and looser scales, and the scales have the radiating striae 
more prominent. The European species have in fact the same squamation as our 
genus Notemigonus. The teeth in Squalius proper are 2, 5-5, 2, in all species, so far 
as examined. 
