42 THE CYPRINODONTS. 
Glaridodon latidens sp. n. 
Plate V. Fig. 11, teeth. 
B.5; D.8; A. 10; V.6; P.12; Ll. 28-30; Ltr. 8; Vert. 13-19. 
Moderately elongate, compressed, caudal pedicel comparatively deep. 
Head little more than depth, more than one fourth of the length to the base 
of the caudal, flattened on the crown. Snout short, blunt, rounded; chin 
very steep. Mouth rather wide, arched transversely, directed upward ; lower 
jaws longer, firmly united; upper short, protractile. Teeth chisel shaped, 
hooked and strong in the outer series ; inner teeth in bands, pointed, com- 
monly expanded near the apex as if two or three cusped ; pharyngeal vary- 
ing in shapes, larger with hook and shoulder. Eye large, longer than snout, 
two thirds of forehead, one third of head. Dorsal origin little behind the 
middle of the total length, above the middle of the base of the anal. Ven- 
trals very small, not reaching anal. Pectorals moderate, reaching behind 
bases of ventrals. Caudal as long as the head, subtruncate or convex. Scales 
large. 
Light olivaceous, darker on back, silvery on opercles, throat, and belly, 
apparently somewhat lighter along the middle of the flank; with narrow 
vertical bars of brown on the sides, more distinct behind the abdomen, one 
of them situated below the hind extremity of the base of the dorsal. Fins 
clouded with brownish. Top of head dark. A dark line from anal to caudal ; 
in cases a similar line on the middle of the side. The brown color is in punc- 
ticulations, sometimes arranged toward the edges of the scales. 
Chihuahua, Mexico. 
Glaridodon januarius. 
Plate V. Fig. 8, teeth; Plate VIII. Fig. 15, male. 
Girardinus januarius Hens., 1868, Arch. f. Nat., XXXIV, 360,— 1869, Arch. f. Nat, XXXV, 89; 
Kig., 1891, P. U. S. Mus., XIV, 65. 
Pecilia januarius Hig., 1894, Ann. N. Y. Ac., VII, 636. 
Girardinus caudimaculatus Hens., 1868, Anew f. Nat.. XXXIV, 362, —1869, Arch. f. Nat., XXXV, 
89; Ther., 1883, Zeitsch. f. wiss. Zool., XXXVIII, 468, pl. 26; Hig., 1891, P. U.S. Mus., XIV, 65 ; Cope, 
1894, ‘NL N. Y. Lyc., VII, 636. 
Girardinus theringii Blgr., 1889, Ann. N. ‘HL, Oct., 266, Hig., 1891, P. U. S. Mus., XIV, 65. 
? Gambusia gracilis Perug., 1891, Ann. Mus. Civ. Gen., X (2), 652. 
Pecilia caudomaculatus Big., 1894, Ann. N. Y. Ac., VII, 636. 
B.5; D. 8-9; A.9-11; V. 5-6; P. 10-12; Ll. 28-31; Ltr. 8; Vert. 
14-- 18. 
Form somewhat resembling that of Gambusia Holbrookii. Stout, well 
rounded, depressed anteriorly, compressed behind the head. Head nearly 
