eigenmann: the cheirodontin^. 



97 



prominent median cusp and four, rarely five, more or less graduate cusps on each 

 side, the two edges of the teeth not quite symmetric; maxillary with two or three 

 broad teeth; mandible with eight graduate teeth, the anterior ones very wide at 

 the tip, contracted at the base, with a prominent median point and three or four 

 slightly graduate points on each side of it, the tips of the lateral points forming a 

 slight curve beyond which the median point projects somewhat, the median cusp 

 at least twice as wide as the two cusps on either side of it; the edges of the teeth 

 overlapping more and more toward the sides of the jaw. Gill-rakers 6 + 10. 



Origin of dorsal about equidistant from tip of snout and tip of adipose, its 

 height equal to the length of the head; adipose well-developed; caudal lobe a little 

 longer than head; origin of anal about under vertical from tip of last dorsal ray, 

 its margin nearly straight from the ninth ray, its base about equal to the head. 

 Origin of ventrals about equidistant from snout, with the origin of the dorsal just 

 reaching anal, or falling short of it by one scale ; pectorals not quite reaching ventrals. 



Lateral line nearly straight; scales everywhere regularly imbricate; caudal 

 naked; anal with a few scales at the base of the anterior lobe; about six feeble 

 interhsemals ; caudal in male without hooks or special scales. 



A silvery lateral band; a conspicuous caudal spot, not continued to the middle 

 of the central caudal rays; anterior margin of dorsal membrane dark. 



54. Odontostilbe madeiras Fowler. 

 Odontostilbe madeiroe Fowler, Proc. Acad. Nat. Sci. Phila., 1913, p. 527 (tributary 



of the Rio Madeira near Porto Velho) . 



Fig. 36. Odontostilbe madeiroe Fowler. (After Fowler, Proc. Acad. Nat. Sci. Pliila., 1913, p. 527.) 



Range : Madeira basin. 



This species is known from the types only. It may be synonymous with 0. 

 Paraguay ensis. 



