150 Bulletin 4y, United States National Museum. 



but few of the following species have been examined as to this character, 

 we are forceil to refer all to the single genus lihamdia. {Nhamdia or Bagre 

 da Rio, a Portuguese name, applied by Marcgrave to Rhamdia sebw, and 

 written " Rhamdia" by Valenciennes, perhaps a misprint.) 



Khamdia: 



a. Koiilauellc in tlieadult notcontiniied behind the eyo; maxillary band of teeth not widened 

 at the edge; occipital process present. 

 (<. Sides with a dark lateral bund; maxillary Iiarbcls rcachinf; little beyond front of adi 

 pos(^ fins; pectoral spine short. w agnf.ri. ^S^'^. 



na. Species with the fontanelle uudescribed, most of tlieni probably belonging to lUimiiddla. 

 r. .\nal r.aysll or 12. 



(I. Adipose fin moderately long, 3V4 to Z% in length. 



e. Maxillary barbels very long, reaching tip of ventr.als. 



BARONIS-MULLEUI, 234. 



ee. Maxillary barbels reaching end of dorsal. 



/. Depth 6% iu length. motagoensis, 235. 



ff. Depth b]{i in lengtli. BRAcnYPTERA, 236. 



ihl Adipose fin short, 4 in length; barbels short, not reaching tip of pectorals. 



SALVINI, 237. 



cc. Anal rays 13 



g. Adipose fin sbort, about 4 in length; barbels reaching end of dorsal. 



iiYPSELi'urs, 238. 

 (7(7. Adipose fin moderate, 3 to SJ/^ in length. 



h. Occipital process rather short. laticauda, 239. 



Ml. Occipital process rather long. godmani, 240. 



ggg. Adipose fin long, more than y^ of length. 



1. Barbels very long, the longest reaching middle of adipose fin. 



GUATEMALENSIS, 241. 



a. Barbels moderate, the longest reaching front of adipose fin. 



NICARAGUENSIS. 242. 



in. Barbels shortish, the longest reaching end of dorsal. microptera, 243. 

 ccc. Anal rays 14 ur 15. 



j. Adipose fin long, more than ^^ of length. manaotjensis, 244. 



j). Adipose fin medinm, 3^^ in length. polycaulu.s, 245. 



Ehamdella, (diminutive of Ehar>i<lia): 

 aaa. Fontanelle continued backward to the occipital process, with a bridge across it behind 

 the eye. 

 k. Upp(!r .jaw scarcely longer than lower; tail deep; pectoral spine about li the head. 



PETENENSIS, 246. 



kk. Upper jaw longer than lower; pectoral spine 2 to 2J in head; dorsal spine very weak, 

 about 2|^ in head, caudal fin about 5 in length. parryi, 247. 



Subgenus RHAMDIA. 



233. RHAMDI.i WAONERI, (Gunther). 



(BARm:i)0.) 



Head 4i; depth 5 i to 7. D. I, 6; A. 9 to 11. Head flat above, with 

 vertical sides; occipital process narrow, reaching about halfway to dorsal 

 spine; maxillary barbel variable, never reaching to end of adipose lin, 

 sometimes little beyond base of dorsal ; gill rakers 3 + 7; caudal deeply 

 divided; its lower lobe broad and rounded, the upper pointed. Color 

 brown, Avith many dark dots; a dark lateral band, darkest forward; base 

 of dorsal pale. Rivers of Central America, on both sides of the moun- 

 tains, very abundant. (Eigenmann.) (Named for Prof. Moritz Wagner, 

 an authority in zoogeography.) 



