116 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Bio Ixtla . — At Puente de Ixtla in Morelos considerable collections were made in 
the Rio Ixtla, a large, clear, cold tributary of Eio Amacusac, which in turn flows into 
Rio de las Balsas. At this picturesque old bridge the conditions are very favorable 
for collections — gravelly bottom, smooth banks, and occasionally deep holes. Some 
specimens were taken from the small Rio Tembernbe, a “spring branch” of Rio Ixtla. 
Bio Panuco . — Collecting was done in the Rio Panuco at Tampico, and in one of its 
tributaries, the Rio Verde, near Rascon, San Luis Potosi. At Tampico the Panuco, 
a very large river, receives the Rio Tamesoe. With the two, a number of large, 
shallow lagoons are connected. Salt tide water backs up into the rivers and lagoons 
for some distance above the city. The lagoons are marshy in most places, the rushes 
and shrubs growing out into the water for long distances. The bottom and shores 
are usually of a sticky blue clay, although there are sandy beaches in some localities. 
By visiting the Tampico markets, many specimens of the larger species were obtained. 
At Rascon the Rio Verde is a rather sluggish stream. Its bottom is of gravel 
in some places, while in others it is muddy. Both east and west of Rascon the 
current of the river is very rapid, often descending the caiion in cascades and cata- 
racts. The water, which is heavily impregnated with lime, is light green in color. 
On either side of the river are great forests of palms, while dense thickets of canes, 
ferns, and vines make it difficult to follow the shores. 
List of species obtained and of the localities in 'which collections were made. 
Species. 
Kio Verde, 
near 
Aguas 
Calientes. 
Laguna de 
Chapala, 
near Ocotlan, 
Jalisco. 
Laguna de 
Chaleo, 
near City 
of Mexico. 
Rio Ixtla, 
near Puente 
de Ixtla, 
Morelos. 
Rio Verde, 
near Rascon, 
San Luis 
Potosi. 
Rio Panuco, 
Rio Tamesoe 
and lagoons 
near Tampico. 
X 
X 
X 
X 
X 
X 
x 
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X 
X 
x 
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X 
X 
x 
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X 
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X 
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X 
x 
X 
X 
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x 
X 
x 
x 
x 
X 
x 
X 
X 
X 
X 
X 
X 
X 
X 
