44 MEMOIRS OF THE CARNEGIE MUSEUM. 



the first four tricuspid, the last four conical. The first four forming a continuous 

 series with those of the premaxillary the four conical ones on the distally curved 

 portion of the bone. Gill-rakers about 5 + 8. 



Scales thin, the margins obscure, a single row of scales along the base of the 

 anal rays; a few scales along the base of the caudal lobes. 



Origin of dorsal slightly behind the middle of body; height of dorsal equal 

 to length of head; caudal lobes about equal to the height of the dorsal; origin 

 of anal about equidistant from the snout and origin of its last third; ventrals small, 

 reaching the anal; pectorals equal to the head less snout, reaching to middle of 

 ventrals. 



Translucent, a median dusky band along middle of caudal peduncle, fading 

 out forward and continued narrowly on middle caudal rays; scales of back faintly 

 marked with chromatophores, which become restricted to the margin of the scales 

 on the upper part of the back. Chin and maxillary black, sometimes a dark streak 

 back from upper part of gill-opening. 



Genus IX. Parecbasis-" Eigenmann. 

 Parecbasis Eigenmann, Indiana University Studies, No. 20, 1914, p. 45. 



Type : Parecbasis cydolepis Eigenmann. 



Teeth tricuspid, in a single series on anterior part of mandible and premaxillary, 

 none on the maxillary or sides of the mandible; upper margin of the maxillary 

 for its entire length heavy, then passing abruptly into a broad, thin, blade-like 

 expanded portion extending to the convex free margin; sides of mandible raised; 

 adipose fin well-developed; caudal partly scaled; lateral line complete. Origin 

 of the dorsal in front of the middle. Cheeks entirely covered by the third sub- 

 orbital, no apparent pseudo tympanum ; frontal fontanel very short. 



20. Parecbasis cyclolepis Eigenmann. (Plate V, fig. 2.) 

 Parecbasis cyclolepis Eigenmann, Indiana University Studies, No. 20, 1914, p. 45. 

 Range : Madeira and Amazons. 



5495, C. M., type, 74 mm.; 5496, C. M., paratype, 80 mm. San Antonio de 



Rio Madeira, Nov. 3, 1909. Haseman. (Two other specimens from the 



same place taken by the same collector at the same time have been placed 



in exchange in the Museum of the Indiana University.) 



6893a, C. M. 50 mm. to end of lateral line. Santarem, Dec. 9, 1909. Haseman. 



6894a-c, C. M., 3, largest 78 mm., San Joaquin, Sept. 6, 1909. Haseman. 



^^ Tapkaffaats, v = a, goiiig out aside from. 



