218 Mr. C. T. Regan— ^ Revision 



width 2| to 2\. 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 f length of 

 head ; 8 or 4 rays longer than spine ; edge of fin 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 ; fins immaculate. 

 Colombia. 



1-2 (types). 50 mm. Honda. Leigh ton. 



From C. ceneus 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 ceneum, Gill, Ann. Lye. N. York, vi. 1858, p. 40.3. 

 Corydoras 7mcrops, Eigenm. & Kennedy, Proc. Acad. Philad. 1903, 



p. 606. 

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



p. 385. 



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 § 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. 

 Ckudal 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.sh lateral band broadening anteriorly into a blotch, 

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

 fins immaculate. 



Trinidad to La Plata. 



