474 CALIFORNIA ACADEMY OF SCIENCES. 



Steindachner states that in younger individuals the snout 

 is strongly curved and steep. These two figures un- 

 doubtedly refer to the same species. 



465. Corydoras acutus. 



Corydoras acutus Cope, 1. c. (Ambyiacu River). 

 Habitat: Ambyiacu River. 



466. Corydoras amphibelus, 



Corydoras amphibelus Cope, Proc. Acad. Nat. Sci. Phila. 1871, 282 



(Ambyiacu River). 

 Habitat: Ambyiacu River. 



467. Gorydoras hastatus, 



Corydoras hastatus Eigenm. & Eigenm. Proc. Cal. Acad. Sci. 2d Ser. 



i, 166, 1888 (Villa Bella). 

 Habitat: Villa Bella. 



Compressed, comparatively slender. Head as deep as 

 long, its width 1J in its length; profile straight, steep; 

 occipital process triangular; fontanel elongate, extending 

 into the occipital bone; preorbital small. 



Eye large, 1J in the snout, 3J in the head, 2 in the 

 interorbital. Snout little decurved; rictal barbels not 

 extending beyond the eye; lower lip terminating in two 

 barbels. 



Coracoid processes striate, forming a ridge on the sides 

 of the belly. 



Distance of the dorsal spine from the snout 2 in the 

 length; the dorsal spine little shorter than the head. 



Caudal deeply forked, 2f in the length. 



Pectoral spine little longer than the dorsal spine, 

 weakly serrate along both margins. 



Light brown; a jet black lateral band terminating at 

 the base of the caudal in a large arrow-shaped spot which 

 is bordered posteriorly with white, which itself is nar- 

 rowly margined with blackish, the caudal dusky beyond; 

 a jet black line extends on either side from a short dis- 

 tance behind the ventrals to behind the anal fin; body 

 and fins everywhere covered with minute black points. 

 Head 3J; depth 2|; D. 1,7-8; A. 7-8; Lat. pi. ff. 



Two specimens .022 m. Villa Bella. Prof. L. Agassiz. 



