64 MEMOIRS OF THE CARNEGIE MUSEUM. 



A large humeral spot over third to fifth scales of lateral line; a dark line from 

 upper part of humeral spot to middle of caudal; caudal spot extending across the 

 entire caudal peduncle, and on middle caudal rays. 



Named in honor of Dr. Alipio de Miranda Ribeiro of Rio de Janeiro. 



Genus XIX. Cheirodon^" Girard. 

 Cheirodon Girard, Proc. Acad. Nat. Sci. Phila., Vol. VII, 1854, p. 199. 



Type : Cheirodon pisciculus Girard. 



Minute fishes ranging from 25 to 60 mm. in length; teeth of the upper and 

 lower jaws similar, with five or more points; usually the tips of the teeth are 

 expanded, more rarely the margins of the teeth are nearly parallel, arranged in a 

 single series; one to three teeth on the maxillary, four to nine teeth on the premaxil- 

 lary (most frequently five) ; cheeks usually nearly completely covered by the third 

 suborbital, but with a naked area around its entire border in C. annce; the origin 

 of the dorsal very nearly equidistant from tip of snout and base of middle caudal 

 rays; adipose fin well-developed; origin of anal about under the last dorsal ray; a 

 variable number of the anal rays and sometimes the ventral rays in the males with 

 numerous hooks, the base of the hook-bearing portion of the anal not infrequently 

 at an angle with the base of the normal portion; interhsemal spines of the caudal 

 peduncle variable, those of the male strong, protruding, sometimes ankylosed and 

 sometimes with broad wing-like lateral processes. Scales thin, regularly imbricate, 

 with a variable number of radial strise. Caudal naked, anal with a few scales in a 

 single series at the base of the anterior rays; scales moderate, between thirty to 

 thirty-six in the lateral series, of which not more than twelve have pores. No 

 humeral spot, the covering of the anterior air-bladder very thin, in a triangular 

 pseudotympanum ; usually a conspicuous caudal spot, more rarely a dorsal spot. 



Range: Amazons, Panama, eastern slope of Colombia, south to the Rio 

 San Francisco, Rio Parahyba, Rio Grande do Sul, and the La Plata basin; western 

 slope of Chili. 



No specimens of Cheirodon pisciculus are at hand. It is possible that the 

 specimens of Cheirodon annce, listed below, the origin of which is unknown, are in 

 reality the types of Cheirodon pisciculus. If so, then the species listed after C. 

 annce are representatives of a genus distinct from Cheirodon. If, however, Cheirodon 

 pisciculus is distinct from C. annce and agrees with the species which here succeed 

 it, then C. annce should be made the type of a distinct genus. C. annce certainly is 

 not congeneric with the other species of Cheirodon here figured. C. microdon and 



'"xe'Pi V = hand; dSuv, 6 = tooth. 



