142 Annals of the Carnegie Museum. 



78. Mylossoma albiscopus (Cope) Piranha. 

 Bahia Negra (394). 



79. Myleus levis Eigenmann & McAtee, sp. nov. (Plate XLII, Fig. 2). 

 Type No. 10156, Bahia Negra, Dec, 1901 (296) 143 mm. 

 Head 3.5 ; depth 1.5 ; D. 27 ; A. 36 ; abdominal serrae 45 ; lat. 



line about 112. 



Form rather polygonal ; nearly straight or slightly concave from 

 snout to end of occipital crest, thence to within 2 cm. of the dorsal 

 fin the anterior margin is strongly arched, thence is straight to the 

 dorsal. From the front of the dorsal to the caudal the back is evenly 

 curved. Caudal peduncle slender, about equal to eye, 2.8 in head. 

 The basis of the anal is straight and meets the ventral profile at a large 

 angle (about 60 degrees). The ventral surface is bounded by a 

 straight, horizontal outline from anal to a point slightly in advance of 

 the ventrals, thence evenly arching to in front of the pectoral, where 

 it is slightly concave. 



Lateral line complete, decurved from above middle of pectoral to 

 below end of dorsal. 



Opercle rounded ; maxillary small, strap-shaped, partly sheathed in 

 first suborbital, not reaching eye. Mandible with 5 strong teeth on 

 each side, the inner 3 large and with slightly wavy edges, the outer 

 two quite small. There are 2 hooked, conical teeth in the middle 

 behind the anterior row ; premaxillaries with two series of teeth, the 

 outer composed of 10 teeth similar to those of the mandible and the 

 inner with 4 broad, concave-topped teeth in a straight row across the 

 jaw. Jaws equal ; snout .8 in eye. 



Dorsal fin rounded, highest in front. Caudal broad, subtruncate ; 

 pectorals 1.2 in head ; ventrals narrow, 2 in head, not reached by the 

 pectorals, nor reaching vent. Anal strongly falcate, the third ray 

 very long and heavy, 1.2 times head. 



Color plain dark brown, lighter below lateral line. Fins clear, 

 except a wide basal portion of the dorsal dusky and a heavy black 

 blotch on the margin of the anal from the longest to the 13th ray, 

 widest on the 4th and 6th rays. 



80. Charax caliurus Eigenmann & Kennedy, sp. nov. (Plate XLIII, 

 Fig. 1.) 



In Proc. Acad. Sci. Phila., Eigenmann & Kennedy describe a 

 specimen, No. 9969 of the I. U. Collection. It was supposed to be 

 the young of squamosus. The present collection contains specimens of 



