GLARIDICHTHYS.—GIRARDINUS. 99 
1. Glaridichthys latidens, 
Glaridodon latidens, Garm. Mem. Mus. Comp. Zool. xix. 1895, p. 42°. 
Glaridichthys latidens, Meek, Publ. Columbian Mias., Zool. v. 1904, p. 184°. 
Depth of body nearly equal to length of head, which is more than } of the length of the fish. Snout shorter 
than eye, the diameter of which is 3 in the length of head. 28 to 30 scales in a longitudinal series. 
Dorsal 8; origin a little nearer to posterior end of caudal than to tip of snout and above the middle of 
the anal. Anal 10, Caudal rounded or subtruncate. Olivaceous; sides with narrow brownish vertical 
bars, which are more distinct posteriorly. 
Hab. Mexico, Chihuahua !. 
12. GIRARDINUS, Poey, 1859, 
Girardinus, Garman, Mem. Mus. Comp. Zool. xix. 1895, p. 45. 
Viviparous. Anal fin, in the male, advanced and modified into a long intromittent organ. Mouth small, 
transverse ; rami of lower jaw weakly connected; tecth unicuspid, movable, in a single series. 
Hab. Carolina to Guatemala; West Indies. 
The three Mexican and Central-American forms are very closely allied and should 
perhaps be regarded as races or subspecies of Girardinus pleurospilus. The following 
description applies to all:— 
Depth of body 33 to 33 in the length, length of head 37 to 41, Snout nearly as long as or shorter than eye, 
the diameter of which is 3 to 34 in the length of head. Interorbital width equal to the distance from 
middle or posterior part of eye to free edge of operculum. 27 to 30 scales in a longitudinal series. 
Dorsal 7-9 ; origin equidistant from tip of snout and end of caudal or a little nearer the latter (@ ). 
Anal 8-10; origin in advance of that of the dorsal. Dorsal and anal fins each with an acute anterior 
angle and nearly straight free edge. Pectoral as long as or a little shorter than the head. Caudal 
rounded or subtruncate. Least depth of caudal peduncle 3 to 3 the length of head. 
1. Girardinus presidionis. 
Pacilia presidionis, Jord. & Culver, Prof. Calif. Ac. Sci. (2) v. 1895, p. 413, t. 29'; Jord. & Everm. 
Bull. U.S. Nat. Mus. xlvii. 1896, p. 6977; Meek, Publ. Columbian Mns., Zool. v. 1904, 
p- 152°. 
A series of narrow dark vertical bars, variable in number, along the side of the body ; one or two of the bars 
sometimes represented by oval spots. 
Hab. Mexico, Rio Presidio in Sinaloa 1? 3. 
Ten examples, measuring up to 70 mm. in total length. In these I am unable 
to detect any trace of an inner series of teeth, even with the aid of a binocular 
microscope. 
2. Girardinus lutzi. 
Heterandria lutzi, Meek, Publ. Columbian Mus., Zool. v. 1904, p. 148, fig. 47°. 
Heterandria pleurospilus, Meek, 1. c.’. 
A series of dark spots along the middle of the side, usually more than eight in number, and each usually 
smaller than the eye. A few spots sometimes expanded vertically ; posterior spots sometimes broken up, 
forming two or even three irregular series. 
O2 
