FISHES FROM THE RIVERS OF MEXICO. 
131 
Lack of material for comparison prevents our commenting on the probable affinities between 
P. limantouri and other species of the genus. 
r. limantouri was numerous in the Rio Tamesoe and the lagoons near Tampico, and also in the 
Rio Verde near Rascon. We identify four specimens of Pceeilia collected at Puente de Ixtla, Morelos, 
with this species. 
We take pleasure in dedicating this pretty fish to Senor Jose Yves de Limantour, the accom- 
plished minister of the “ Hacienda” for Mexico, in recognition of favors received through his courtesy. 
26. Mollienisia latipinna Le Sueur. 
A few specimens which we identify as Mollienisia latipinna were collected in the lagoons near 
Tampico. Some measurements of these are given. 
Measurements of jive specimens of Mollienisia latipinna. 
Measurements. 
Locality: Tampico, Mexico. 
Male. 
Female. 
Length of body in millimeters 
43 
35 
41 
37 
28 
Depth of body expressed in hundredths of length 
38 
36 
36 
34 
34 
Depth of caudal peduncle 
23 
21 
20 
20 
18 
28 
30 
30 
30 
20 
Width of interorbital space 
15 
16 
15 
15 
15 
Length of snout 
10 
10 
11 
10 
12 
Width of mouth 
10 
11 
11 
10 
10 
Diameter of orbit 
9 
10 
10 
10 
10 
Distance from snout to dorsal fin 
53 
47 
52 
49 
48 
Height of longest dorsal rays 
21 
20 
15 
14 
16 
Distance from snout to anai tin 
56 
56 
66 
63 
64 
Height of longest anal rays 
22 
24 
18 
16 
17 
Distance from anal to caudal tin 
48 
48 
33 
35 
35 
Length of caudal fin 
30 
28 
25 
27 
28 
Length of pectoral fin 
25 
25 
21 
23 
23 
Distance from snout to ventral fin 
49 
49 
50 
50 
52 
Length of ventral fin 
19 
20 
15 
15 
15 
Number of rays in dorsal 
15 
14 
13 
13 
13 
Number of rays in anal 
8 
8 
8 
8 
8 
N um her of scales in lateral series 
28 
28 
28 
27 
28 
Number of scales in transverse series 
9 
8 
9 
9 
9 
Number of scales on caudal peduncle 
7 
7 
7 
7 
7 
As shown in the following table, there is considerable variation in certain characters between 
specimens of M. latipinna from different localities : 
Measurements of Mollienisia latipinna. 
Measurements. 
Tampico, Mex. 
Pensacola, Fla. 
Savannah, G-a. 
Withlacoochee, Fla. 
Male. 
Female. 
Male 
Female. 
Male. 
Female. 
Male. 
Female. 
Width of interorbital space . 
15 
16 
15 
15 
15 
13 
13 
13 
14 
14 
14 
14 
14 
14 
14 
15 
16 
15 
16 
Diameter of orbit 
9 
10 
10 
10 
10 
7 
7 
8 
8 
8 
8 
8 
8 
7 
74 
10 
10 
9 
9 
Length of snout 
10 
10 
11 
10 
12 
9 
94 
8 
9 
9 
8 
8 
74 
8 
9 
9 
9 
10 
10 
Depth of caudal peduncle . . . 
23 
21 
20 
20 
18 
25 
23 
23 
20 
22 
24 
22 
19 
18 
19 
20 
20 
19 
18 
Distance from snout to dorsal 
Distance from snout to ven- 
53 
47 
52 
49 
48 
32 
33, 
32 
45 
44 
40 
43 
50 
50 
53 
52 
53 
53 
56 
trals 
49 
49 
50 
50 
52 
45 
44 
43 
52 
49 
45 
44 
47 
47 
53 
45 
54 
52 
51 
27. Xiphophorus montezumae Jordan & Snyder, new species. Fig. 11. 
Type, a female; No. 6145; L. S. Jr. Univ. Mus. From Rio Verde, near Rascon, San Luis Potosi, 
Mexico. Collected by J. O. Snyder January 24, 1899. 
Head 4.20 in length, depth 3; depth of caudal peduncle 4.66; eye 3.25 in head; snout 3.25; inter- 
orbital space 2 ; height of dorsal 3.50 in length ; anal 5; length of pectoral 4.20; ventral 4.50; upper 
rays of caudal 3.33; lower rays 1.10. D. 13. A. 7. Scales in lateral series 29; transverse series 9; 
on caudal peduncle 7. 
