of the Genus Coryduvas. 217 



17. Corydoras hastatus. 



Eigenm. & Ei^enm. Proc. Calif. Acad. (2) i. 1888, p. 160, and Occ. 

 Pap. Calif. Acad. i. 1890, p. 474. 



Depth of body 2f in the lengtli, lenn^th of head 3^. Diam- 

 eter of eye 3^ in length of head and 2 in interorbital width. 

 Barbels not extending beyond eye. Dorsal I 7-8 ; spine 

 nearly as long as head. Anal 7-8. Pectoral spine a liule 

 longer than dorsal spine. Scutes 22/20 ; humeral shit Ida 

 not in contact below. Light brown; a jet-black lateral band 

 ending at base of caudal in a large arrow-shaped spot, 

 bordered posteriorly with white and again with a narrow 

 blackish margin ; minute black points on body and fins. 



Amazon at Villa Bella. 



Corydoras australis, Eigenm. & Ward (Ann. Carnegie 

 Mus. iv. 1907, p. 123), from Paraguay, is said to be very 

 closely related to hastatus, and ])erhaps identical with it ; it 

 has the same caudal s{)Otj but the lateral band is represented 

 by an indistinct dusky line. 



18. Corydoras undulatus, sp. n. 



Corydoras mia-ops (non Eigenm. & Kennedy), Eigenm. & Ward, Ann. 

 Carnegie Mus. iv. 1907, p. 123, pi. xxxviii. figs. 2, 3. 



Depth of body 21 to 2^ in the length, length of head 3^ to 

 4. Diameter of eye 5 to 6 in length of head, interorbital 

 width 1^ to If. Snout nearly as long as postorbital part of 

 head ; prseorbital narrow ; barbel nearly or quite reacliing 

 gill-opening. Occipital plate a little longer than broad. 

 Dorsal I 7-8 ; .^pine | length of head ; second and third soft 

 rays longest, tifth as long as spine ; base of fin longer than 

 distance from adipose, which is preceded by 3 or 4 median 

 scutes. Anal 1 7. Caudal deeply emarginate. Pectoral 

 spine extending to base of pelvics. Scutes ||^ ; humeral 

 shields not in contact below, on each side separated by a 

 single scute from base of pelvics. Yellowish, with dark 

 purplish spots tending to run together, forming undulating 

 longitudinal bands ; tins with or without series of spots. 



La Plata. 



1 (type). 55 mm. La Plata. WolterstorfF. 



2-3. 35 mm. „ Arnold. 



19. Corydoras vielanotcenia, sp. n. 



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

 to 3|. Diameter of eye 5^ in the length of head, interorbital 



