EDWIN CHAPIN STARKS 19 



54. Serrasalmo spilopleura Kner. 



A fine specimen of this species was taken by Mr. Mann and Dr. Baker 

 at the mouth of the Madeira River. 



55. Metynnis hypsauchen (Miiller and Troschel). 



A single small specimen was taken at Para. 



56. Metynnis maculatus (Kner). 



One specimen was taken at Lake Papary and two at Lake Extremoz. 

 One of the specimens from the last locality has the anal slightly convex 

 and angulated in front, as in the picture accompanying the original descrip- 

 tion. The other has it more rounded in front and produced at a rounded 

 angle at the anterior third ; probably the mark of the male. It also has the 

 spots larger and more definite than in the others. A much darker spot is 

 present in all of them above the anterior end of the lateral line. 



57. Myleus parma (Gunther). 



Four specimens 6 inches long and one 1 1 inches, taken in the market 

 at Para. The large one has the middle anal rays produced (male), and 

 the procumbent predorsal spine is scarcely evident. The depth (in the 

 smaller ones) is contained lyi times in the length, and the head 4 times. 

 The back is highest at the front of the dorsal, and the ventral outline 

 deepest at the anal, so that the cross axis of the body is oblique. The anal 

 lobe is a trifle longer than the head, and longer than the anterior dorsal 

 rays. The pectoral does not reach to opposite the ventral, which reaches 

 half way, or a little more, from its base to the anal. There are 36 to 38 

 ventral scutes. The front lobe of the anal is black, and all of the ventral 

 fins are margined with black behind. 



58. Mylosoma aureum (Spix). 



Three specimens were taken at the mouth of the Madeira River by Dr. 

 Baker and Mr. Mann. The depth is from lyS to 1^ in the length to the 

 caudal base. The anal is angulated behind the posterior third, as in the 

 drawing published by Spix. There are 43 or 44 ventral scutes, with 4 or 5 

 paired ones surrounding the vent. One specimen has 49 scutes, all of them 

 simple and running at one side of the vent. In this it is apparently ab- 

 normal. 



59. Mylosoma albiscopus (Cope). 



Two specimens taken at Para seem to be referable to this species. The 

 anal is less angulated than in Mylosoma aureum but more evenly rounded, 



