134 Field Columbian Museum — Zoology, Vol. VII. 



Consul General, for many courtesies; also to Mr. Hodgson, General 

 Manager, and Mr. Tisdal, Assistant General Manager of the Guate- 

 mala Central Railroad, who very materially aided me in transpor- 

 tation. 



Family Siluricl?e. 



Rhamdia parryi (Eigenmann). 



Head 4.1 to 4.3 in length of body; depth 4.5 to 4.8 ; snout to dorsal 

 2.7 to 2.8; length of adipose fin 3.3 to 3.6; snout 2.4 to 2.8 in head; 

 interorbital 3.3 to 3.6; diameter of eye 4.5 to 4.8 ; pectoral spine 1.8 to 

 1.9 ; base of anal 1.3 to 1.6; least depth of caudal peduncle 2.3 to 2.4; 

 anal rays 10 or 11 ; maxillary barbels reaching to middle of base of 

 dorsal fin. Sides with a dark lateral band. 



Caballo Blanco (5), 85 to 126 mm.; San Jose del Idolo (i), 130 mm. 



Rhamdia cabreras Meek. 



This species much resembles the preceding. It has a shorter head, 

 a more slender body, a less elevated dorsal region, and shorter fins. 

 The maxillary barbels are much shorter, their tips seldom reaching 

 base of pectoral spine, and not to its middle. 



Lake Amatitlan (36), 75 to 145 mm. 



Rhamdia god man i (Gtinther). 



Head 2.25; depth 5.45; D. 1.7; A. 10; snout to dorsal fin 2.88 in 

 body; length of adipose fin 2.72; maxillary barbels reaching slightly 

 past origin of adipose fin; base of dorsal 1.83 in head; its height 1.68 ; 

 height of adipose fin 7.45; base of anal 2.90; pectoral spine 2.51; 

 least depth of caudal peduncle 2.58; diameter of eye 6.78; interor- 

 bital 2.58; snout 2.45. 



Color bluish, ventral region white; a light bar on dorsal fin. This 

 species differs from Rhamdia nicaragiiense, which it most resembles, in 

 having a longer head. 



One specimen from El Rancho, 223 mm. 



Family Cliaraciiiida'. 



Aftyanax «neus (Giinther). 



Tetragonopterus fasciatus Giinther, Cat., v, 322, 1864 (part), Hua- 

 muchal; Rio Guacalate; Rio Chisoy, Vera Paz; Mexico; Cor- 

 dova; Guatemala; Central America. 



