FISHES FROM THE RIVERS OF MEXICO. 
129 
Xenendum xaliscone differs from X. caliente in not having villi form teetli ; in having more scales 
in the lateral and transverse series and on caudal peduncle. It differs from X. luitpoldii (Stein- 
dachuer), which is the third known species of the genus, in having a much longer snout, a more pointed 
head, and in not having villiform teeth. 
Measurement s of five female specimens of Xenendum xaliscone. 
Measurements. 
Locality: L. de Chapala near 
Ocotlan, Jalisco, Mexico. 
Length of body in millimeters 
142 
124 
122 
110 
117 
Dept h of body expressed in hundredths of length 
32 
33 
32 
34 
33 
Depth of caudal peduncle 
16 
18 
17 
18 
17 
22i 
23 
23 
23 
23 
Width of interorbital space 
13 
14 
13 
14 
13 
Length of snout 
7 
8 
8 
7 
7 
Width of mouth 
8 
9 
9 
8 
8 
Diameter of orbit 
6 
6 
6 
6 
6 
Distance from snout to dorsal tin 
66 
64 
65 
66 
66 
Height of longest dorsal rays 
15 
15 
13 
15 
17 
Distance from snout to anal tin 
70 
69 
69 
69 
68 
1] 
13 
12 
13 
Distance from anal to caudal fin 
25 
26 
27 
26 
27 
Length of caudal tin 
21 
21 
20 
21 
20 
Length of pectoral fin 
18 
20 
19 
20 
21 
Distance from snout to ventral fin 
49 
49 
51 
50 
49 
Length of ventral fin 
13 
14 
14 
134 
14 
Number of rays in dorsal 
13 
13 
12 
12 
12 
14 
14 
15 
14 
Number of scales in lateral series 
42 
41 
40 
40 
40 
Number of scales in transverse series 
17 
16 
16 
16 
17 
Number of scales on caudal peduncle 
12 
12 
12 
12 
11 
Fig. 9. — Xenendum xaliscone Jordan & Snyder, new species. Type. 
25. Pcecilia limantouri Jordan & Snyder, new species. Fig. 10. 
Type, a male, No. 6165, L. S. Jr. Univ. Mus. From Rio Tamesoe, near Tampico, Tamaulipas, 
Mexico. Collected by J. O. Snyder, January 12, 1899. 
Head 3.5 in length ; depth 3 ; depth of caudal peduncle 4.6 ; eye 3.5 in head ; snout 3 ; interorbital 
space 2; height of dorsal 5.5 in length ; anal 4.5; length of pectoral 4.5; ventral 6, caudal 3.5. D. 9. 
A. 9. Scales in lateral series 26; transverse series 9; on caudal peduncle 8. 
Body rather deep and compressed ; dorsal outline angular, its highest point at insertion of dorsal ; 
lowest point of ventral outline at base of ventrals ; head pointed; interorbital space wide and flat; 
eye large, nearer to tip of snout than to posterior edge of operclo a distance equal to diameter of 
pupil. Mouth very oblique, its width twice diameter of pupil ; premaxillary protractile; distal end 
of maxillary visible; lower jaw projecting. Teeth in two series on both jaws; the outer series in a 
single row, small, pointed, loosely attached; second series barely discernible, in bands. Gill-openings 
extending above base of pectoral a distance equal to half diameter of orbit. Gillrakers on first arch 
20, small and slender. Alimentary canal very long and slender. 
Body and entire head except preorbital area, lips, and lower jaw covered with large scales ; 3 rows 
of scales on base of caudal; small scales extending on interradial membranes of caudal, a distance 
F. C.B. 1899— 9 
