212 Mr. C. T. Regan— A Revision 



not in contact below, eacli separated by 1^ scutes from base 

 of pelvic fin. A lateral series of 4 or 5 dark oblong spots, 

 the tliird below the adipose fin ; a similar series of spots on 

 the back ; dorsal dusky anteriorly and usually with spots on 

 the rays ; caudal usually barred with series of spots ; lower 

 fins immaculate or anal sometimes with a spot. 



1-4 (types). 50 mm. La Plata. Doria. 



5. Corydoras paleafu.t. 



Callichthys paleatus, Jenvns, Zool. ' Bea^^le,' Fish. p. 11.3 (1842). 

 Corydoras marmoratus, Steind. Denkschr, Akad. Wieii, 1879, p. 26, 



pi. V. fig. 1. 

 Corydoras paleatus, Eigenm. & Eigenm. Occ. Pap. Calif. Acad. i. 1890, 



p. 471. 

 ? Corydoras aurofrenatus, Eif?enm. & Kennedy, Proc. Acad. Philad. 



1903, p. 507; Eigenm. & Ward, Ann, Carnegie Mus. iv. 1907, 



pi. xxxviii. fig. 4. 

 Corydoras ehrhardti, Steind. Anz. Akad. Wieu, 1910, p. 60. 

 ? Corydoras meridionalis, R. von Ihering, Rev. Mus. Paulist. viii. 1911, 



p. 381. 

 ? Corydoras nattereri triseriatns, von Ihering, t. c. p. 386, 

 ? Corydoras Jlaveolus, von Ihering, t. c. p. 387. 



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

 3^. Snout as long as or a little longer than postorbifal part 

 of head ; diameter of eye 4 to 5 in the length of head, inter- 

 orbital width 2 to 25. Suborbital narrow ; barbel rarely 

 reaching gill-opening. Dorsal I 7-8 ; spine § to as long as 

 head ; soft rays decreasing from first, which is longer than 

 spine ; base nearly equal to distance from adipose tin, which 

 is preceded by 2 or 3 median scutes. Anal I 6. Pectoral 

 spine extending to or beyond base of pelvics. Scutes 22— 

 24/20-22 ; humeral shields not in contact below, each sepa- 

 rated from base of pelvic fin by one scute. Three oblong 

 dark spots along middle of side, respectively below the dorsal 

 and adipose fins and on the caudal peduncle, connected with 

 less detinite spots on the back ; both series of spots may 

 unite to form longitudinal bands ; dorsal dusky anteriorly 

 and with spots on the rays ; caudal barred ; lower fins each 

 with a single spot ; sometimes some or all the fins immaculate. 



La Plata; Rio Grande do Sul ; Sta. Catharina. 



1 (one of the types). 35 mm. Cambridge Mus. 



2-3. 70 mm. Buenos Ayres. White. 



4-6. 60 mm. Parana. Salmin. 



7-9. 25 mm. R. Grande do Sul. von Ihering. 



10-11. Dried. Cordova. 



12 (co-type of C. ehrhardti). Joinville. Steindachner. 



