FISHES FROM THE RIVERS OF MEXICO. 
121 
We have one specimen of Algansea tincella from Lago de Chaleo. It is not distinguishable, except 
in its darker color, from those taken in the Rio Verde. These differ from the description and iigure 
of A. dugesi (Bean, Proc. U. S. Nat. Mus., 1892, 283) in having much smaller eyes and a deeper caudal 
peduncle. They have a distinct black spot at the base of the caudal. The specimens taken in the 
Rio Lerma, at Salamanca, by Professor Woolmau, and recorded as A. dugesi (Woolman, Bull. U. S. 
F. C. 1894, 61), agree in every respect with those from the Rio Verde and are referred by us to the 
same species. Some of Mr. Woolman’s specimens are in the museum of Stanford University. 
9. Notropis nigrotasniatus (Giinther). 
Graodns nigrotceniatus Giinther. Cat., VII, 485, 1868, Atlisco, Mexico. 
Locality, Rio Ixtla at Puente de Ixtla, Morelos. 
As shown by our specimens, A r . nigrotceniatus differs from the closely related species, N. rasconis 
of the Rio Pauuco system, in having a thicker and heavier body, a shorter snout, smaller eyes, shorter 
and more rounded tins, a wider lateral band, the black dots of which are distributed over a space 
about the width of two scales, a. less distinct caudal spot, and the color-band not definite on the snout. 
Measurements of two specimens of Notropis nigrotceniatus. 
Me as u rera en ts . 
Locality : 
Bio Ixtla. 
51 
60 
26 
26 
12 
23 
11 
23 
20 
20 
8 
8 
7 
7T 
6\ 
6 
51“ 
52 
21 
21 
67 
66 
16 
35 
17 
33 
25 
25 
20 
19 
47 
48 
16 
16 
8 
8 
9 
12 
8 
12 
14 
15 
38 
36 
10. Notropis rasconis Jordan & Snyder, new species. Fig. 3. 
Type specimen No. 6153, L. S. jr. Univ. Mus. 
Three specimens belonging to the genus Notropis, which resemble very closely Ah nigrotceniatus 
of the Rio de las Balsas system, were collected in the Rio Verde, near Rascon, January 25, 1899, by J. O. 
Snyder. They differ from that species, 
however, in haviug a more compressed 
body, a longer snout, larger eyes, longer 
and more pointed tins, and in having the 
color-band narrower on the body and more 
marked on the snout. 
Head 4 inlength; depth 3.50; eye 2.66 
in head; snout 3.33; interorbital space 3; 
depth of caudal peduncle 2.25; height of 
dorsal 4.33 in length; anal 5.20; length of 
pectoral 5.5; ventral 5.5; caudal 3.5; 
number of scales in lateral line 33; between dorsal and occiput 15; between dorsal and ventral 
tins 10. D. i, 8. A. i, 8. P. 12. 
Dorsal outline of body evenly rounded from snout to insertion of dorsal flu, slightly concaved 
from latter point to base of caudal; ventral outline evenly rounded to end of anal base; deepest 
part of body just anterior to insertion of dorsal; width of body one-seventh of its length. Snout 
pointed, mouth oblique, lower jaw included; maxillary not quite reaching vertical from anterior 
margin of orbit. Teeth 4-4. frail and easily detached from the arch; slightly hooked; no evident 
grinding surface. Gillrakers short and blunt, reduced to slight elevations on lower part of first arch. 
Fig. 3. — Notropis rasconis Jordan & Snyder, new species. Type. 
