8. FTJNDULUS. 321 



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

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

 violet sjiot 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 (IG). 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 sliglitly jirojecting 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-fourth 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 corres])onds to the second of the dorsal. Dorsal 

 and anal fins subquadrangular, ratlier 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 with a very indistinct dark band along the side. 

 Fins immaculate ; anal with a light margin. 



The sexual oi^ening of the female is not attached to the anterior 

 anal rays. 



Guatemala • Western Eciiador. 



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

 Salvin's Collection. 



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

 Mr. Salvin's Collection. 



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

 lection. 



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

 From Mr. Fraser'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 candal). Head very thick and broad, its 

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

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



VOL. VT. 



