8. FTTN'DULUS. 321 



tending to the base of the ventrals. Bro-wnish-olive, paler below ; 

 each scale, especially those on the tail, with a vertical dark-purpHsh- 

 violet spot on the centre. Dorsal with three or four series of 

 blackish dots, anal with a whitish margin. 

 Chiapam. 



a. Male, 3|- inches long. From Mr. Salvin's Collection. 



5. Pundulus guatemalensis. 



D. 12 (13). A. 14-15 (16). L. lat. 32-35. L. transv. 12. 



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

 toral, equals the length of the head, and is one-fourth or rather 

 more than one-fourth, of the total length (without caudal). Head 

 thick and broad ; interorbital space broad, slightly convex, its width 

 being a little less than one-half of the length of the head. Snout 

 broad, obtuse, with the lower jaw slightly projecting beyond the 

 upper ; mandible longer than the eye. The diameter of the eye is 

 equal to, or, in the larger specimens, less than the length of the 

 snout, one-foui'th of that of the head, and one-half of the width of 

 the interorbital space. The origin of the dorsal fin is midway be- 

 tween the extremity of the caudal and the posterior margin of the 

 orbit, and corresponds to the nineteenth scale of the lateral line. 

 The first anal ray corresponds to the second of the dorsal. Dorsal 

 and anal fins stibquadrangular, rather low, longer than high in the 

 male, and as long as high in the female. Two-thirds of caudal 

 covered with small scales. Brown above and on the sides, pale 

 below ; females A^th a very indistinct dark band along the side. 

 Fins immaculate ; anal with.a light margin. 



The sexual opening of the female is not attached to the anterior 

 anal rays. 



Guatemala ; Western Ecuador. 



a. Many specimens, 3 inches long. Lake of Duenas. From Mr. 



Salvin's Collection. 

 h. Several specimens, 2-3 inches long. Lake of Amatitlan. From 



Mr. Salvin's Collection. 



c. Male, 3| inches long. Kio Guacalate. From Mr. Salvin's Col- 



lection. 



d. Many specimens, from 3 to 3| inches long. Western Ecuador. 



From Mr. Eraser's Collection. 



6. Fundulus pachycephalus. 



This species is closely allied to F. guatemalensis, but has a thicker 

 head and smaller eye. 



D. 13-14. A. 15. V. 6. L. lat. 35. L. transv. 12. 



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

 toral, is contained thrice and one-fifth or thrice and four-fifths in 

 the total length (without caudal). Head very thick and broad, its 

 length being contamed thrice and one-third in the total. Inter- 

 orbital space very broad, slightly convex, its width being one-half 



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