216 Mr. C. T. Pti'gan— ^ Revision 



longer than licad, extending to or beyond middle of pelvics. 

 Scutes 22-23/20 ; humeral shields not in contact below, each 

 separated by one scute from base of pelvic fin. Sides with 

 small dark spots, strongest anteriorly, and forming longitu- 

 dinal series above and below the lateral line ; traces of spots 

 on dorsal rays; other fins immaculate. 

 R. Amazon. 



1-2 (types). 60 mm. Xeberos. Higgins. 



3-4. 55 mm. Huallagas. „ 



5-8. 30-35 mm. E. Jurua. Bach. 



According to Cope's description C. amphihelus seems 

 differ from C. armatus only in the barred caudal fin. 



to 



15. Corydoras polystictus, sp. n. 



Depth of body 2^ to 2| in the length, length of head 3^ to 

 3i. Snout strongly decurved, a little longer than diameter 

 of eye, which is 3 in the length of head; interorbital width 2. 

 Suborbital narrow ; barbel nearly reaching gill-opening. 

 Dorsal I 7 ; spine nearly as long as head ; soft rays de- 

 creasing from first, which is as long as or a little longer than 

 spine ; base more than distance from adipose fin, which is 

 preceded by 2 median scutes. Anal I 6. Pectoral spine as 

 long as head, extending to middle of pelvics. Scutes 21- 

 22/i9-20. Longitudinal series of small dark spots on sides 

 of body and on rays of dorsal fin ; other fins immaculate. 

 1-2 (types). 35 mm. Descalvados, Matto Grosso. Ternetz. 



16. Corydoras melani'siius, sp. n. 



Calliddhys pimctatits (non Bloch), Giinth. Cat. Fish. v. p. 229 (1864). 



Depth of body 2\ in tlie length, length of head 3^. 

 Snout nearly -^ length of head ; diameter of eye 3^ in the 

 length of head, interorbital width 2 to 2^. Suborbital 

 narrow, its depth about | diameter of eye ; barbel not 

 reaching gill-opening. Dorsal I 7 ; spine as long as head ; 

 soft rays decreasing from first, which is as long as spine ; 

 base a little more than distance from adi|)Ose fin, which is 

 preceded by 4 median scutes. Anal I 6. Pectoral spine as 

 long as or longer than head, extending to or beyond middle 

 of pelvics. Scutes 21-23/19-20; humeral shields not in 

 contact below, each separated by one scute from base of 

 pelvic fin. 3 or 4 series of small dark spots on side; dorsal 

 fin blackish, the colour extending on to the back below it ; 

 other fins pale, immaculate. 

 1-2 (types). 50 mm, Essequibo. Ehrhardt. 



