25S Mr. C. T. Re^ran on 



XXX. — Dcscrijitionn of Six new Freshwater Fishes from 

 Mexico and Central America. By C. Tate Regax, B.A. 



Pivielodus Boucardi. 



Depfh of boily 6i in the lentrtli, length of head 4. Breadth 

 of head \\ in its leiiajth, length of snout 2t, diameter of eye 6, 

 interorbital width 3. Lower jaw nearly as long as the 

 iip|»er ; maxillary barbel extending to origin of adipose fin. 

 Head covered with smooth skin ; occipital process rather 

 strong, extending 1 tlie distance from its base to the origin of 

 dorsal. Dorsal I (5, the spine slender, the fin rounded, as 

 high as long. Adipose fin \ the length of the fish. Anal 14. 

 Pectoral spine with serrated inner edge, about i the length of 

 the fin and ^ the length of head ; humeral process long, 

 nearly reaching the middle of the fin ; ventrals originating 

 nearly below the last dorsal ray, extending more tiian § of 

 the distance from their base to the origin of anal. Caudal 

 deeply notched, the lobes rounded, the lower the larger. 

 Least depth of caudal peduncle ^ the length of head. 

 Blackish. 



Hah. Yucatan [Boucard). 



A single specimen, lUO mm. in total length. 



rimelodus hrachycephalus. 



Depth of body 5| to 6^ in the length, length of head 5^ 

 to .Oi. Breadth ot iiead 11 in its length, length of snout 2| 

 to '6, diameter of eye 5 to 6, interorbital width 3 to 3^. 

 Lower jaw a little shorter than the upper ; maxillary barbel 

 extending to the basal part of pectoral. Head covered with 

 smooth skin ; occipital process short. Dorsal I 6, the spine 

 slender, the fin rounded, as high as or higher than long. 

 Length of adipose fin 3| to 3j in the length of the fish. 

 Anal 12-13. Pectoral spine with serrated inner edge, about 

 ^ the length of the fin and | the length of head ; humeral 

 process short ; ventrals originating beliind the dorsal, ex- 

 tending ^ to I the distance from their base to the origin of 

 anal. C'audal moderately notched, the lower lobe rounded 

 and rather shorter than the upper. Least depth of caudal 

 peduncle § or more tlian § the length of head. Brownish. 



JIah. Guatemala, Rio Nacasil {Snlvin). 



Six specimens, measuring up to 190 mm. in total length. 



