FISHES FROM THE RIVERS OF MEXICO. 
143 
Measurements of four specimens of Chirostoma lermai. 
Measurements. 
Collected in market of 
Guadalajara, said to 
have come from Lago 
de Chapala. 
Length of body in millimeters 
162 
152 
145 
150 
Depth of body expressed in hundredths of length 
21 
194 
19* 
18 
Depth of caudal peduncle 
9 
H 
84 
8 
3U 
32 
32 
33 
Distance from snout to occiput 
Tip of lower jaw to occiputTT. 
24‘ 
24J 
25 
24 
26 
254 
26 
254 
Width of interorbital space 
6 
64 
6 
6 
m 
12 
13 
13 
6~b 
6 
6 
6^ 
Distance from snout to spinous dorsal 
56' 
57 
59 
574 
Insertion of spinous dorsal to soft dorsal 
12 
13 
13 
14 
Height of longest dorsal spines 
n 
6£ 
8 
8 
Height of longest dorsal rays - 
13 
14 
14 
12 
Distance from snout to anal tin 
634 
64 
674 
64 
Height of longest anal ray3 
14 
15 
15 
144 
Distance from anal to caudal fin 
17 
17 
17 
174 
19 
20 
21 
21 
19 
19 
19 
194 
49| 
Distance from snout to ventral fin 
471 
49 
51 
1H 
11 
12 
11 
Number of spines in first dorsal 
4 
4 
5 
4 
Number of rays in second dorsal 
12 
11 
10 
11 
Number of rays in anal - 
22 
20 
19 
20 
Number of rays in pectoral 
15 
14 
15 
14 
Number of scales in lateral series 
54 
58 
55 
58 
Number of scales in transverse series 
19 
20 
18 
17 
Number of scales between dorsal tins 
12 
11 
11 
11 
CICHLIDiE. 
37. Cichlasoma steindachneri Jordan & Synder, new species. Fig. 20. 
Type No. 6164, L. S. Jr. Univ. Mas. Collected by J. O. Snyder, January 24, 1899, from Rio Verde, 
near Rascon, San Luis Potosi, Mexico. 
Head 2.5 in length; depth 3; depth of caudal peduncle 7.5; eye 3.40 in head; snout 2.80; inter- 
orbital space 5; longest dorsal spine 4; ray 2; longest anal spine 2.66; ray 2; length of pectorals 1.5; 
yentrals 1.75 ; caudal 1.5. D. xvi, 10. A. v, 9. P.14. Scales in lateral series 30; in transverse series 16; 
on caudal peduncle 8. 
Length of head exceeding its depth a distance equal to diameter of orbit. Body elongate, deepest 
above ventrals; curve of dorsal outline interrupted by a slight elevation above eye and a rather rapid 
descent at base of soft dorsal ; ventral outline less curved than dorsal ; interorbital space convex ; orbit 
somewhat elongate laterally, located slightly nearer to tip of snout than to posterior edge of opercle ; 
its lower edge a little above a horizontal from mouth to middle of caudal peduncle; cleft of mouth 
almost horizontal; maxillary, except distal end, concealed by preorbital; lips thick, the lower with a 
narrow frenum; jaws equal, the upper moderately protractile. Teeth in 2 series on each jaw; outer 
series iu a single row, large, canine-like, far apart; inner series minute, in bands; tips of teeth brown 
colored ; no teeth on vomer or palatines. Gill-membranes forming a fold across the isthmus. Gillrakers 
ou first arch 10, short and blunt. 
Body covered with large weakly ctenoid scales, head with cycloid scales; upper part of head 
anterior to middle of orbit, snout, preorbital area and ventral part of head naked; a single row of 
small scales along bases of dorsal and anal fins; small scales on basal part of interradial membranes of 
caudal. Lateral line interrupted at fourteenth scale, beginning again 3 scales lower and extending 
to base of caudal; first dorsal spine very short, others gradually longer to the sixth or seventh, after 
which the spines are of about the same length; sixth and seventh dorsal rays longest, about 1^ 
times length of longest spine ; depressed fin extending to posterior edge of dark caudal spot ; first anal 
spino shortest, one-fiftli as long as fifth spine; fourth, fifth, and sixth rays longest; depressed fin 
extending to anterior edge of caudal spot; caudal fin evenly rounded; pectorals rounded, extending 
to a vertical from vent. Outer rays of pectorals longest, extending to vent. 
Color in alcohol, light olive ; darker above than below ; an indistinct, dark lateral band extending 
from snout to caudal; 8 or 9 scarcely distinguishable dark vertical bands on sides of body; irregular- 
dark spots at intersection of lateral and vertical bands; a small dark spot at base of caudal; small, 
distinct dark dots on anterior dorsal region of head. 
