128 
BULLETIN OP THE UNITED STATES FISH COMMISSION. 
Alimentary canal long (in another specimen, 4T times length of body), coiled many times. Peritoneum 
black. Genital opening close to basis of anal, covered by a thick, notched pad. Dorsal fin inserted 
posteriorly, rounded; its basis short, its length less than height of fin; anal inserted under dorsal, 
first 5 rays crowded together and shortened, edge of fin double convex — the notch being' between the 
shorter and longer sets of rays; pectorals and ventrals with rounded edges; caudal evenly rounded. 
Body and head everywhere except jaws and preorbital area with scales; no lateral line. 
Color light-olive, growing darker above; median dorsal area blackish, each scale with a dark, 
angular band, those of the sixth series below the dorsal darker, making an indistinct, narrow lateral 
band; all the fins except ventrals dusky. 
The females differ but slightly from the males. The body of the former is more thickset, the 
caudal peduncle a little less deep, the fins a little lower, aud the anal evenly rounded. The young 
are somewhat mottled in color. 
Xenendum caliente differs from X. luitpoldii Steindachner, in having fewer scales in the lateral and 
transverse series and on the caudal peduncle, and iu a similar way from X. xaliscone, besides having 
villiform teeth, which are absent in X. xaliscone. 
Measurements of ten specimens of Xenendum caliente. 
Measurements. 
Locality: Itio Verde, Aguas Caiieutes, Mexico. 
Male. 
Female. 
Length of body in millimeters 
63 
71 
67 
63 
48 
72 
7* 
73 
73 
45 
Depth of body expressed in hundredths of length 
37 
34 
35 
36 
37 
40 
34 
33 
34 
35 
Depth of caudal peduncle 
18 
17 
17 
17 
17 
16 
16 
17 
16 
16 
Length of head 
27 
26 
26 
25 
27 
25 
25 
25 
24 
26 
Width of iuterorbital space 
13 
13 
13 
13 
13 
14 
13 
13 
13 
13 
Length of snout 
9 
9 
9 
9 
9 
9 
9 
8 
9 
8 
Width of mouth 
9 
9 
9 
94 
9J 
84 
84 
9 
8 
9 
Diameter of orbit 
6 
6 
6 
7 
74 
6 
64 
6 
6 
74 
Distance from snout to dorsal tin 
72 
70 
70 
71 
72 
744 
72 
70 
73 
73 
Height of longest dorsal rays 
19 
184 
19 
19 
18 
17 
14 
16 
16 
15 
Distance from snout to anal lin 
72 
72 
7H 
70 
72 
72 
69 
69 
70 
71 
Height of longest anal rays 
15 
L4 
14 
14 
13 
12 
124 
13 
12 
15 
Distance from anal to caudal fin 
23 
24 
24 
24 
25 
23 
24 
24 
24 
26 
Length of caudal fin 
22 
20 
20 
21 
20 
21 
19 
20 
19 
19 
Length of pectoral fin 
20 
20 
20 
20 
20 
19 
19 
18 
13 
18 
Distance from snout to ventral fin 
54 
51 
53 
54 
53 
53 
514 
51 
53 
53 
Length of ventral tin 
13 
14 
13 
13 
13 
12 
13 
13 
13 
14 
Number of rays in dorsal 
13 
12 
14 
13 
12 
13 
13 
13 
13 
13 
Number of rays in anal 
14 
14 
14 
14 
14 
14 
13 
14 
14 
13 
Number of scales in lateral series 
36 
37 
37 
37 
35 
38 
37 
38 
38 
38 
Number of scales in transverse series 
14 
13 
13 
13 
14 
14 
14 
13 
14 
14 
Number of scales on caudal peduucle 

9 
9 
9 
9 
9 
9 
9 
9 
10 
9 
24. Xenendum xaliscone Jordan & Snyder, new species. Fig. 9, 
Type, a female, No. 6148, L. S. Jr. Uni v. Mus. Locality, Laguna de Chapala, near Ocotlan, Jalisco, 
Mexico. Date, December 26, 1898. Collector, J. O. Snyder. 
Head 4.66 in length; depth 3.33; depth of caudal peduncle 6.5; eye 3.80 in head; snout 3; inter- 
orbital space 1.66; height of dorsal 6.50 in length; anal 9; length of pectoral 5.25; ventral 7.50; 
caudal 5. D. i, 13. A. i, 14. Scales in lateral series 42, transverse series, counting upward and 
forward from origin of anal, 17 ; on caudal peduncle, 12. 
Body thickset, deepest at origin of ventrals, widest at bases of pectorals; caudal peduncle deep 
and long. Head large and pointed; interorbital space broad, slightly convex; mouth vertical, its 
width equal to length of snout; maxillary very protractile. Teeth loosely attached, broader at distal 
ends than at bases, bicuspid, iu two rows on each jaw; no villiform teeth present. Gill-openings 
extending above base of pectorals a distance about equal to diameter of pupil. Gillrakers long, flat, 
very close together, 56 on first arch. Alimentary canal long, in many folds. Peritoneum black. 
Dorsal fin inserted posteriorly, first ray simple, closely attached to second; edge of fin rounded. 
Anal inserted on a vertical passing through base of fourth dorsal ray, similar to dorsal in shape; 
pectoral and ventral fins rounded ; edge of caudal a little convex, basal one-fourth with scales. Scales 
large, everywhere on body and head except lower jaw and preorbital area; no lateral line. 
Color plain, dark above, light below, the dark color leaving off rather abruptly on the head 
along a line passing through lower edge of eye; on the body, along a line passing from lower edge of 
base of pectoral to caudal, leaving lower one-fifth of caudal pedunclo light; faint traces of a dark 
spot at base of each scale on dorsal region of body ; all the fins except ventrals dusky. 
One male specimen was taken. It resembles the females in general appearance. The anal fin is 
not advanced nor modified into an intromittent organ. Although it is injured, it shows that the first 
5 or 6 rays were close together and shortened. 
