320 cyprinodontidj:. 



toral, is two-ninths of the total length (without caudal). Head 

 rather depressed, its length being contained four times or four times 

 and a third in the total. Interorbital space broad, slightly convex, 

 its width being less than one-half of the length of the head. Snout 

 broad, obtuse, depressed, with the jaws perfectly equal in front ; 

 mandible very short, not longer than the eye. Upper lip well de- 

 veloped, broad, extending to the angle of the mouth. The diameter 

 of the eye is less than the length of the snout, or than one-fourth 

 of that of the head, and, in females, one- half of the width of the 

 intoroi'bital space, whilst in males the forehead is somewhat nar- 

 rower. The origin of the dorsal fin is midway between the ex- 

 tremity of the caudal and the orbit, and corresponds to the twentieth 

 scale of the lateral line. The first anal ray is opposite to the first 

 of the dorsal. Dorsal fin as high as long in both sexes ; anal fin 

 rounded in the male, scarcely higher than long, much elevated in 

 the female, the length of its base being two-thirds only of its depth. 

 Genital opening of the female immediately in front of, but discon- 

 nected from, the anal fin. Basal thii'd of the caudal fin (which is 

 sub truncate) scaly. Body uniform brownish olive, paler below ; 

 sometimes irregular cloudy markings on the tail. Fins immaculate ; 

 the anal fin of the male is black at the base, and bright yellow on 

 its marginal half; also the upper margin of the dorsal fin of the 

 same sex is yellowish, 

 Guatemala. 



a-c. Males, 4 inches long. Guatemala. From Mr. Salvin's Col- 

 lection. 



d-f. Females, from 4 to 4| inches long. Rio San Geronimo. From 

 Mr. Salvin's Collection. 



<7-7t. Females, 3 inches long. Yzabal. From the Collection of 

 Messrs. Salvin and Godman. 



4. Fundulus punctatus. 



D. 12. A. 13. V. 6. L. lat. 34. L. transv. 12. 



Tho height of the body, taken on the level of the base of the pec- 

 toral, is two-ninths of the total length (without caudal). Head 

 depressed, its length being one-fourth of the total. Interorbital space 

 very broad, slightly convex, its width being one-half of the length 

 of the head. Snout broad, obtuse, much depressed, with the lower 

 jaw scarcely projecting beyond the upper ; mandible longer than the 

 eye. Upper lip of moderate breadth, not extending to the angle of 

 the mouth. The diameter of the eye is less than the length of the 

 snout, two-ninths of that of the head, and less than one-half of the 

 width of the interorbital space. The origin of the dorsa^ fin is 

 somewhat nearer to the extremity of the caudal than to the orbit, 

 and corresponds to the nineteenth scale of the lateral line. Th'' 

 first anal ray is opposite to the third of the dorsal Dorsal and anal 

 fins subquadrangular, with the outer margins convex : both are a 

 little longer than high. Caudal fin subtruncate, scaly on its basal 

 half. Pectoral fins shorter than the head (without snout), not ex- 



