of the Genus Covydora^. 211 



the lenoth. Snout more than ^ tlie length of head ; cliametei* 

 of eye 6 in length of head, interorbital width o. Suborbital 

 narrow; barbel nearly reaching gill-opening; males with 

 bristles on sides of snout. Dorsal I 7—8 ; spine about | 

 length of head ; soft rays decreasing from first, the fourth or 

 fifth as long as spine ; base equal to or less than distance 

 from adipose fin. Anal I G-7. Pectoral spine extending a 

 little beyond base of pelvics. Scutes 26-27/22-23 ; humeral 

 shields wide apart, each separated by 2 scutes from base of 

 pelvic fin. Dark blotches at bases of dorsal and adipose fins 

 alternate and are connected with a series of blotches on tlie 

 side, which may unite to form a band ; head spotted or 

 reticulated ; dorsal and caudal with series of spots on rays ; 

 lower fins with or without spots. 



1-4 (co-types of C. eige7i- Near Saatos. R. von Ihering'. 



manni). 45-60 mm. 



3. Corydoras micracoMthus, sp. n. 



Depth of body 3 to 3^ in the length, length of head 4. 

 Diameter of eye 6 or 7 in length of iiead ; snout as long as 

 postorbital part of head or interorbital width. Suborbital 

 narrow; barbels nearly or quite reaching gill-opening. 

 Dorsal I 8 ; spine ^ the length of head ; fin small, rounded, 

 its base less than its distance from adipose fin, which is 

 preceded by 1 or 2 median scutes. Anal I 6. Pectoral 

 spine not reaching base of pelvic fin. Scutes 25/22; humeral 

 shields widely separated below, each separated by 2 scutes 

 from base of pelvic fin. Yellow, with a series of 3 to 6 dark 

 brownish or purplish spots along the side and a second series 

 on the back ; dorsal dusky anteriorly, sometimes with spots 

 on rays ; caudal barred ; lower fins immaculate. 



1-8 (types). 35-50 mm. Salta, Argentina. Borolli. 



9-10. „ „ Steinbach. 



4. Corydoras microcephalus, sp. n. 



Depth of body 3 in the length, length of head 3f . Snout 

 as long as or a little longer than postorbital part of iiead ; 

 diameter of eye 4^ in the length of head, interorbital width 2-|. 

 Suborbital narrow ; barbel nearly reaching gill-opening. 

 Dorsal I 6-7 ; spine | to | the length of head ; first and 

 second rays longest, the edge of fin slightly convex ; base 

 about equal to distance from adipose fin, which is preceded 

 by 1 or 2 median scutes. Anal I 6. Pectoral spine ex- 

 tending to base of pelvics. Scutes 22-23/20 ; humeral shields 



