of the Genus Cory doras. 215 



11. Corydoras trilineatas. 



Cope, Proc. Acad. Philad. 1871, p. 281, pi. vi. fig. 2. 

 ? Corydoras acutus, Cope, I. c. 



Very closely related to C. elegans, but with a larger eye, 

 its diameter \ the length of head in a specimen of 49 mm. 

 A yellowish lateral band with brownish margin above and 

 below and blackish median line; dorsal rays blackish supe- 

 riorly ; caudal barred; anal spotted. 



Ambyiacu H. 



According to Eigenmaini this species is the same as 0. 

 agassizii, but it has the shorter snout and broader operculurn 

 of C. elegans. 



12. Corydoras punctatus. 



Cataphractus puiidatus, Bloch, Ausl, Fisch. pi. ccclxxvii. fig. 2 (1794). 



A species resembling C. elegans and C. trilineatus in form 

 and in coloration, tlie dorsal fin blackish superiorly and some 

 spots along the middle of the side; caudal barred. 



Surinam. 



13. Corydoras raimxmdi. 

 Stemd. Anz. Akad. Wien, 1907, p. 84. 



Depth of body 3 to 4 in the lengthy length of head d>\ to 3|-. 

 Diameter of eye 5 to 6 in the length of head, interorbital 

 width 2, length of snout 2. Dorsal I 8. Anal I 6. Pectoral 

 fin usually a little shorter than head. Scutes 23-25/22-23. 

 3 longitudinal series of greyish-violet spots on the body ; 

 a blackish band across middle of dorsal fin ; caudal with 

 cross-bars, 



fiio Parnahyba near Victoria, 



14. Corydoras arm at us. 



CaUichthys armatus, Giinth. Proc. Zool. Soc. 1868, p. 230, fig. 

 ? Corydoras amphihelus, Cope, Proc. Acad. Philad. 1871, p. 282. 



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

 Snout a little longer than eye, the diameter of Avhich is Zl in 

 the length of head ; interorbital width 2. Suborbital narrow, 

 its depth less than ^ diameter of eye ; barbel not reaching 

 gill-opening. Dorsal I 7-8 ; spine as long as depth of body 

 below it ; soft rays decreasing from first, which is a little 

 shorter tlian spine; base equal to or a little more than 

 distance from adipose fin, which is preceded by 4 or 5 

 median scutes. Anal I 6-7. Pectoral spine as long as or 



15* 



