CYPRINODON. 83 
Only two well-established species, C. macularius and C. bovinus, have been recorded 
from Mexico, but two others known to occur in the Rio Grande system are probably 
to be met with in its southern tributaries and are therefore included here. In all 
these the origin of the dorsal fin is about in the middle of the length of the fish 
(without the caudal fin), and the anal commences below the posterior part of the dorsal. 
Synopsis of the Mexican and Central-American Species *. 
I. Longest dorsal rays, in the male, only a little more than 4 the length of head, 
less than the length of base of the fin 2. . 2. 2 6 © ee ee ee L. elegans. 
II. Longest dorsal rays, in the male, from 3 to as long as the head, not shorter than the base of 
the fin. 
A. Longest anal rays considerably shorter than those of the dorsal. 
Diameter of eye 34 to 4in the length of head (in specimens measuring up 
to 60 mm.) ; pectoral 3 the length of head . . «© «© . . ee 1. 2 bovinus. 
Diameter of eye 3 to 34 in the length of head (in specimens measuring up 
to 70 mm.); pectoral as long or nearly as long as the head. . . . . 3. variegatus. 
B. Longest anal rays scarcely shorter than those of the dorsal . . . . . . 4. macularius. 
1. Cyprinodon elegans. 
Cyprinodon elegans, Baird & Girard, Proc. Ac. Philad. 1853, p. 889’; Girard, U.S. Mex. Bound. 
Surv., Fish. p. 66, t. 37. figs. 1-7 (1859)*; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 
1896, p. 675°. 
Depth of body 22 in the length, length of head 33. Snout as long as eye, the diameter of which is 33 in 
the length of head; interorbital width 22 in the length of head. 26 scales in a longitudinal series. 
Dorsal 11; longest rays less than the length of base of the fin, scarcely more than 3 the length of head, 
shorter than the longest anal rays. Anal 11. Pectoral 3 the length of head. Caudal subtruncate, 
Least depth of caudal peduncle 12 in its length, 2 the length of head. Dark brownish above, yellowish 
beneath ; upper parts with irregular dark spots; a dark band along the middle of the side; fins pale ; 
basal half of dorsal with small dark spots; caudal with a narrow blackish posterior edge. 
Hab. Camanche Springs, Rio Grande? 2. 
Here described from a single specimen, a male, measuring 50 mm. in total length, 
received from the Smithsonian Institution. 
2. Cyprinodon bovinus, 
Cyprinodon bovinus, Baird & Girard, Proc. Ac. Philad. 1853, p. 389'; Girard, U.S. & Mex. Bound. 
Surv., Fish. p. 67, t. 37. figs. 12-18 (1859)*; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 
1896, p. 673°. 
* C. carpio, Giinth., from Florida, apparently does not extend further south. It is recognizable by the 
large eye (diameter 4 the length of head in specimens of 80 mm.) and by the humeral scale, which is not 
enlarged. 
C. marta, Steind., from the coast of Colombia, may occur in Central America; it appears to have a more 
slender body than the species described here. 
M 2 
