16 FISHES FROM BRAZIL 



46. Astyanax 'bimaciilatus Linnaeus. 



Many specimens were taken at Para, Lake Extremoz, Lake Papary and 

 Ceara Mirim. 



Specimens of 4 inches in length and over from Para have the caudal 

 spot and lateral band almost entirely absent. British Guiana specimens of 

 all sizes (collected by Dr. Eigenmann) have the spot and band conspicuous. 

 Comparing small specimens the difference is not so great. The anal has 31 

 or 32 rays, and there are from 30 to 33 series of scales. 



The specimens from Lake Extremoz, Lake Papary and Ceara Mirim 

 have the spot and band as in the British Guiana specimens or even darker, 

 and the anal has from 25 to 27 rays. These are perhaps referable to 

 Astyanax bimaciilatus nova Eigenmann, though the lateral band is not so 

 definite as in the picture of the original specimen. Among the smaller 

 specimens of from 2 to 2^^ inches in length are many variations of the 

 humeral spot. Sometimes it is elongate horizontally ; sometimes it is round ; 

 sometimes the faint streak extends up and down from it ; and sometimes 

 the streak becomes so pronounced that the spot is elongate vertically. The 

 larger specimens do not vary in this respect, the spot being always elongate 

 vertically. There are breeding females among these only 2 inches in length. 



In life the Lake Papary specimens were silvery with golden yellow 

 tinges, which were more conspicuous over the faint lateral band. The 

 pectoral and caudal were yellow, the latter much darker, and the anal and 

 ventrals bright red. 



I fail to appreciate the naked predorsal line in either these or the 

 British Guiana specimens, though the latter have been referred by Dr. Eigen- 

 mann to the genus Poecilurichthys, which he differentiates by this character 

 in his key. 



47. Chalcinus angulatus curtus Garman. 



Four specimens were collected by Mr. Mann and Dr. Baker in the Rio 

 Madeira about 400 miles from its mouth. The depth is contained in the 

 length to the caudal from 23/^ to 2^/^ times. 



48. Chalcinus angulatus fuscus Garraau. 



A single specimen taken at the mouth of the Rio Madeira by Mr. Mann 

 and Dr. Baker is evidently referable to the subspecies. The back is dark 

 and has longitudinal dusky stripes following the rows of scales. The lips 

 and barbels are dusky, and the latter are as long as the eye. All of the fins 

 are duskv. 



