BULLETIN OF THE 
Gila gibbosa BAIRD & GIRARD. 
D. 3+8; A. 34-8; V. 148; P. 14; L. lat. 90; L. trans. 18 + 1 + 12. 
Formulæ taken from a type specimen sent by the Smithsonian Institution. 
Cheonda nigrescens GRD.; JORDAN. 
Tigoma nigrescens GIRARD. 
D.3-2-9; A3+9; V.9; P.17; L. lat. 74; L. trans. 16 + 1 + 10. 
Teeth 5.2 — 2.5. 
| Head one fourth of the total length, excluding the caudal fin. 
Parras. 
Cheonda modesta sp. nov. 
D.24-8; A.34-8; V. 1--8; P. 15 ; L. lat. 65; L. trans. 144 1 ]- 9. | 
Teeth 5.1—1.5. s 
Length of head more than height of body, three and one half times in the 
total length, without the caudal. Body moderately stout, compressed, outline 
curving regularly from. the head to the dorsal. Outline of the head prominent 
upon the ethmoid, from whence it is nearly straight to the back of the head, 
or to the lip. A vertical from the anterior extremity of the dorsal passes be- 
hind the base of the ventral. Dorsal convex on the posterior border. Anal 
truncate. Distinguished from the preceding by the greater length and shape 
of the head, shorter body, and a difference in the position of the dorsal. 
Brownish, lighter below ; cheeks silvery. The flanks have not the lustrous 
appearance of those of C. nigrescens. 
V Saltillo. 
Astyanax argentatus Barro & GIRARD. 
D.11; A. 24-21; V. 8; P. 13; L. lat. 37 ; L. trans. 64-146. 
Tributaries of the Lago del Muerte and springs near Monclova. 
Cyprinodon latifasciatus sp. nov. 
D. 12; A. 11; V. 6; P. 14; L. lat. 20-31; L. trans. 11. 
Height of body three and length of head four times in the total length. 
Outline and teeth as in C. gibbosus Girard ; black band on end of caudal much 
wider. A light band from the middle of the opercle to the lower half of the 
caudal ; a dark band above this is separated by a narrower band of light from 
the dark olive of the back. Silvery color of the belly separated from the light 
band on the flanks by a short band of brown. Fins clouded with brown. 
Caudal with a narrow black band across its base, and a broad one across its ex- 
tremity. Light bands silvery in young. 
From a spring near Parras, Dr. Palmer. 
