vf the Genus Corydoras. 217 



17. Corydoras hastaius. 



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

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



Depth of body 2| in the length, lena;th of head 3^. Diam- 

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

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

 nearly as long as head. Anal 7—8. Pectoral spine a li^tlo 

 longer than dorsal spine. Scutes 22/20 ; humeral shields 

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

 ending at base of caudal in a large arrow-shaped sp(jt, 

 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, j). 123), from Paraguay, is said to be very 

 closely related to hastatus, and perhaps identical with it ; it 

 has the same caudal spot, but the lateral band is represented 

 by an indistinct dusky line. 



18. Corydoras undulatus, sp. n. 



Corydoras 7}iicrops (non Eigenm. & Kennedy), Eigenm. & Ward, Ann. 

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



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

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

 width Ih to If. Snout nearly as long as postorbital part of 

 head ; prseorbital narrow ; barbel nearly or quite reaching 

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

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

 rays longest, fifth 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 deejdy emargiuate. 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 ; fins with or without series of spots. 



La Plata. 



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



2-3. 35 mm. „ Arnold. 



19. Corydoras melanotCBnia, sp. n. 



Depth of body 3j to 3g- in the length, length of head S^- 

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



