218 m. G.T. Uegan— A Revision 



width 2^ to 2i. Snout ^ the length of head ; suborbital a 

 little narrower than diameter of eye ; barbel nearly or quite 

 reaching gill-opening. Dorsal I 7 ; spine about ^ length of 

 head ; 3 or 4 rays longer than spine ; edge of tin slightly 

 convex; base nearly equal to distance from adipose fin, 

 which is preceded by 3 or 4 median scutes. Anal I 6. Pec- 

 toral spine extending to base of pelvic. Scutes || ; humeral 

 shields widely separated below, and each separated by one 

 scute from base of pelvic fin. Brownish above, yellowish 

 below ; a broad blackish lateral band j fins immaculate. 



Colombia. 

 1-2 (types). 50 mm. Honda. Leigliton. 



From C. CBneus of the same size they differ in the more 

 elongate form, smaller head, longer snout, narrower inter- 

 orbital region^ and more numerous scutes. 



20. Corydoras ceneus. 



Iloplosoma csnemn, Gill, Ann. Lye. N. York, vi. 1858, p. 403. 

 Ceri/doras microps, Eigenm. & Kennedy, Proc. Acad. Pliilad. 1903, 



p. 506. 

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



p. 885. 



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

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

 width 2. Snout as long as or longer than postorbital part of 

 head ; suborbital not very narrow, in the adult its depth 

 about equals the diameter of eye or its distance from upper 

 lip ; barbels usually extending to gill-opening. Dorsal I 7-8 ; 

 spine 5 to § the length of head ; first or second soft rays 

 longest, 2 to 6 rays longer tlian spine, free edge slightly 

 convex; base about equal to distance from adipose fin, 

 which is preceded by 3 to 5 median scutes. Anal I 6-7. 

 Caudal deeply emarginate. Pectoral spine extending to or 

 beyond base of pelvics. Scutes ^^ ; humeral shields not in 

 contact below, on each side separated by a single scute from 

 base of pelvic fins. Brownish above, yellowish below ; a 

 blacki.sli lateral band broadening anteriorly into a blotch, 

 Avhich may join others on occiput and at base of dorsal fin ; 

 fins immaculate. 



Trinidad to La Plata. 



1-3. 70 mm. Granada. Higgins. 



4-5. 50-60 mm. Trinidad. Guppy. 



6-8. 40 mm. „ Hart. 



9. 60 mm. Urucum, Matto Grosso. Borelli. 



10-11. 40-50 mm. Carandasinho, Matto Grosso. „ 



12. 70 mm. Sara, Bolivia. Steinbach. 



