456 



PROCEEDINGS OF THE ACADEMY OF 



[Oct. 



physis. Greater portion of maxillary basally with a jagged denticulate 

 edge. Tongue fleshy, triangular and little free in front. Inter- 

 orbital space convex. Gill-opening forward opposite anterior margin 

 of eye. Rakers 9+15, lanceolate, a little longer than filaments or 

 I of eye. Scales striate. Tubes of lateral line simple. Vent close in 

 front of anal. Color in alcohol olivaceous-brown, greenish tint prob- 

 ably due to copper in preservative, and back a little darker. Fins 

 all brownish, bases of pectoral, ventral and caudal with a little dusky 



Fig. 45. — Rceboides myersii (Gill). 



tint. A dusky humeral blotch above lateral line about size of orbit, 

 and also one of same shade on base of caudal, though both rather 

 indistinct. Iris dusky-reddish. Length 6| inches (caudal damaged). 

 Three from the Peruvian Amazon, 



The 3 examples from the Ambyiacu show : Head 3^^ to 3|- ; depth 2f 

 to 2f ; D. II, 9, rarely ii, 8; A. iv, 47, i to 52, i, frequently 49, i; scales 

 about 84 to 86 in lateral line to base of caudal ; snout 3^ to 4 in head ; 

 eye 3^ to 3f ; maxillary If to H; interorbital 3^ to 3-|-; pectoral li 

 to 1^; ventral If to If; total length of body (caudals mostly damaged) 

 3| to 6^ inches. 



