60 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
margin of dorsal slightly nearer caudal than snout; a dark spot on the last rays of the dor- 
sal; margin of ventrals almost under origin of dorsal. Head in body, 3^; depth, 2^; eye in 
head, 3. Common, hut not as plentiful as Ci/prinodoii eximins. These specimens probably 
belong to the species called Cyprinodon el cyans by Girard. 
11. Gambu.sia nobilis Baird & Girard. The general form and color is that of Gamhusia affinis. Not- 
withstanding the wide range and '^■ariability of G. affinis there are some constant differences 
in specimens from this locality that possibly amount to siiecific importance. The depth, 
although somewhat hard to determine on account of the young in the abdomen, appears to 
be greater than that of G. affinis; the scales are also smaller, there being 36 to 38 against 30 
to 33 in G. affinis. The caudal lin is never barred, and the dark bar under the eye is faint, 
but always present. 
12. Tetragonopterus argeiitatus (Baird & Girard). Only three small specimens taken. Color steel- 
blue; lateral band and caudal spot very distinct. Measurements are as follows; 
Length. 
Ueail. 
Depth. 
Lateral 
line. 
Dorsal. 
Anal. 
mm. 1 
mm . 
mm. 
5U 1 
18 
17 + 
36 
10 
21 
48 
13— 
10 
36 
10 
21 
54 
14 
18 
36 
10 
21 
13. Etheostoma micropterus Gilbert. Fifteen specimens of this fish were taken from the shallow 
ripples above the irrigation dam below the city. They agree, in general, with the original 
description (Proc. Nat. Mus., xiii, 1890, pp. 289-290), but differ in a few details, such as the 
smaller number of dorsal spines, coloration, etc. 
14. Etheostoma australe .Jordan. (Etheostoma scovelli Woolman, Amer. Nat., vol. xxvi, p. 260, 
March, 1892.) 
Body stout; head large; snout abruptly decurved; back but little elevated; caudal 
peduncle broad ; spinous dorsal low. Body barred with about ten bars of a dark purple 
color, each about 1^ mm. in width, olive between ; the first, second, and fifth extending 
over back. Pectoral and ventral fins plain ; spinous dorsal bordered with black ; also an 
imperfect dark stripe very near base of dorsal ; soft dorsal with two broken black stripes ; 
caudal barred. Mouth horizontal, lower jaw included ; maxillary extending a little past 
front of orbit, nearly to edge of pupil. Lateral line incomplete, reaching to about midway 
of soft dor.sal. 
RIO DE LERMA AT SALAMANCA, MEXICO. 
The city of Salamanca is in the State of Guanajuato, about three-quarters of a 
mile south of the Mexican Central Railway and 150 miles northwest of the City of 
Mexico. It is built on the banks of the river Lerma, one of the largest streams in 
Mexico. This river is tributary to the Pacific Ocean, flowing first in a westerly direc- 
tion some 80 or 90 miles to Lake Chaiiala, whence it continues in a northwesterly 
direction to the sea under the name of the Rio Grande de Santiago. At Salamanca 
the river is possibly 75 feet wide, with an average depth of from 3 to 8 feet. At the 
season of the year when the collection was made the stream was considerably swollen, 
very muddy, and had a swift current. The bed, especially in the more shallow places, 
is composed of flue gravel, with a few large angular stones. During the dry season 
the river is fordable in some places and the water becomes almost clear. The bed of 
the stream is about 500 feet in width and the banks low. The river drains a number 
of small lakes located on the plateau, and at Salamanca it is about 6,000 feet above 
sea level. 
