G-LlEIDlCHTlirS.— GIEAEDIXUS. 99 



1. G-laridichtliys latidens. 



Glaridodon latidens, Garm. Mem. Mus. Comp. Zool. xis. 1895, p. 42 '. 



Glaridichthys latidens. Meek, Publ. Columbian Mns., Zool. v. 1904, p. 134'. 



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. 2S 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. 



Hah. Mexico, Chihuahua i. 



12. GIRARDINUS, Poey, 1S55. 



Girardinus, Garman, Mem. Mus. Comp. Zool. xix. 1895, p. 45. 



Vmiiarous. Anal fin, in the male, advanced and modified into a long intromittent organ. Mouth small, 

 transverse ; rami of lower jaw weakly connected; teeth uniouspid, movable, in a single series. 



Ilab. 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 i^leurosjulas. The following 

 description applies to all : — 



Depth of body 3j to 3| in the length, length of head 3| to -H. Snout nearly as long as or shorter than eye, 

 the diameter of which is 3 to 3j 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 f to J the length of head. 



1. G-irardinus presidionis. 



Pacilia j^residionis, Jord. & Culver, Prof. Calif. Ac. Sci. (.3) v. 1895, p. 413, t. 29 ' ; Jord. & Everm. 

 Bull. U.S. Nat. Mus. xlvii. 1896, p. 697'; Meek, Publ. Columbian Mus., 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. 



Hal. Mexico, Rio Presidio in Sinaloa ^ - ^. 



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. 



Hetcrandria 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. 



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