RHAMDIA., 133 
Here described from a large series of specimens, including the types of the species, 
measuring from 95 to 280 mm. in total length. 
Pimetodus baronis-miiileri, Trosch., 1865 (Rhamdia baronis-mulleri, Jord. & Everm. 
Bull. U.S, Nat. Mus. xlvii. 1896, p. 151), is probably identical with P. guatemalensis. 
8. Rhamdia godmani. (Tab. XXI. fig. 1.) 
Pimelodus godmani, Giinth. Cat. Fish. v. p. 124 (1864) *. 
Rhamdia godmani, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 1527. 
? Rhamdia sacrijficii, Barbour & Cole, Bull. Mus. Comp. Zool. 1. 1906, p. 156, t. 2°. 
Depth of body about 6 in the length, length of head 4 to 44. Breadth of head 13-14 in its length, length of 
snout 22 to 24, diameter of eye 54 to 7, interorbital width 22 to 31. Lower jaw a little shorter than 
the upper; width of mouth about 2 the width of head. Maxillary barbel extending about to origin of 
adipose fin. Head covered with smooth skin; occipital process extending about 2 of the distance from 
its base to the origin of dorsal. 7 to 9 gill-rakers on the lower part of the anterior arch. Dorsal I 6 
(exceptionally I 5); spine slender, fin rounded. Length of adipose fin 24 to 3 in the length of the fish. 
Anal 11-13. Humeral process not extending beyond the middle of pectoral spine, which is 3 to ? the 
length of the fin and 2 to 4 the length of head. Ventrals inserted behind the last dorsal ray, extending 
3 to 2 of the distance from their base to the origin of anal. Caudal deeply notched. Least depth of 
caudal peduncle 2 to 24 in the length of head or 12 to 2 in the distance from anal to base of caudal. 
Brownish ; dorsal dusky, with a pale band. 
Hab. Mexico! (Sallé), Yucatan?; Guatemata, Baja Vera Paz! (Godman & Salvin), | 
Rio Motagua! (Salvin). 
Here described from eight specimens, including the types of the species, measuring 
from 150 to 270 mm. in total length. 
9. Rhamdia microptera. (Tab. XXIII. fig. 3.) 
Pimelodus micropterus, Giinth. Cat. Fish. v. p. 124 (1864) °. 
Rhamdia microptera, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 153°. 
Depth of body 64 in the length, length of head 43. Breadth of head 13 in the length, length of snout 24, 
diameter of eye 6, interorbital width 3. Jaws nearly equal anteriorly ; width of mouth rather more 
than 2 the width of head. Maxillary barbel extending to middle of dorsal fin. Head covered with 
smooth skin; occipital process extending 2 of the distance from its base to the origin of dorsal. 7 gill- 
rakers on the lower part of the anterior arch. Dorsal I 6; spine slender, fin rounded. Length of 
adipose fin 23 in the length of the fish. Anal 13. Humeral process extending nearly to tip of pectoral 
spine, which is 2 the length of the fin and } the length of head. Ventrals inserted behind the last dorsal 
ray, extending 3 of the distance from their base to the origin of anal. Caudal deeply notched. Least 
depth of caudal peduncle 2! in the length of head and 14 in the distance from anal to base of caudal. 
Dark greyish; fins dusky. 
Hab. Guatemata, Rio San Gerénimo1! (Godman & Salvin). 
Here described from the type, a specimen measuring 170 mm. in total length. 
10. Rhamdia managuensis. (Tab. XXI. fig. 2.) 
Pimelodus managuensis, Giinth. Trans. Zool. Soc. vi. 1868, t. 474°. 
Rhamdia managuensis, J ord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 153’, 
