1913.] NATURAL SCIENCES OF PHILADELPHIA. 535 



ventral pointed. Color largely pale. Obscure or pale humeral 

 blotch. No caudal blotch. 



One species in the Madeira River basin. This genus appears 

 allied to Holoshesthes Eigenmann, and Holoprion Eigenmann, in the 

 completely denticulated maxillary. It differs, however, in the 

 simple conic teeth and more numerous anal rays. From Holoshes- 

 thes it differs in the incomplete 1. 1. Coelurichthys Ribeiro I have 

 been unable to consult. 



(Ilpcw^, saw; /^/"z/^-a, bream; in allusion to the superficial resemblance 

 to the bream.) 

 Prionobrama madeirae sp. nov. Fig. 9. 



Head 4^; depth 3|; D. ii, 8; iii, 32, i, P. i, 12; V. i, 7; scales 

 39 in 1. 1. to caudal base, and 4 more on latter; 10 tubes in 1. 1.; 12 

 scales transversely between dorsal and ventral origins; 15 scales 

 before dorsal to occipital process; head width 2 in its length; head 

 depth at occiput 2; mandible 2|; least depth of caudal peduncle 1|; 

 ventral 1; snout 3| in head, measured from upper jaw tip; eye 3; 

 maxillary 2|; interorbital 3. 



Body well compressed, elongate, ovoid in contour, deepest at dorsal 

 origin, lower profile a little more evenly convex than upper, post- 

 ventral trenchant and other edges convexly rounded. Caudal 

 peduncle well compressed, its length about f its least depth. 



Head rather small, compressed, upper profile nearly straight and 

 much less inclined than more convex lower, and flattened sides but 

 slightly constricted below. Snout convex over surface and anteriorly 

 in profile, and its length about f its width. Eye large, rounded, not 

 elevated, its centre about first f in head. Pupil rather large, verti- 

 cally ellipsoid. Eyelids free, not adipose-like. Mouth superiorly 

 terminal, broad, with short commissure. Lips firm. Maxillary 

 free, rather slender, well inclined beyond front eye edge, though not 

 to that of pupil. Teeth uniserial, conic, simple, small, nearly uniform. 

 In upper jaw teeth continuous along edge of maxillary to its lower 

 extremity. Mandibular teeth slightly larger and recurved at 

 symphysis, also at their anterior termination along sides of mandib- 

 ular rami, and beyond latter point teeth uniformly small and incon- 

 spicuous if present. Inner buccal folds broad. Tongue depressed 

 free and rather pointed in front. Mandible convex over surface 

 protrudes slightly and rami not elevated inside mouth. Nostrils 

 together, large, level with upper eye edge, anterior simple pore and 

 posterior wide crescent. Interorbital evenly convex. Suborbitals 

 smooth, and large infraorbital completely covers cheek. Hind 



