166 CALIFORNIA iVCADEMY OF SCIENCES. 



18. Corydoras aeneus (Gill.) 



19 Corydoras armatus (Giinther.) 



20. Corydoras paleatus (Jenyns.) 



Corydoras marmoratus Steindachuer; Callichthys punctaius Val. aucl 



Cuv. & VhI. 

 Locality: Uraguay. 



21. Corydoras punctatus (Bloch.) 



Corydoras geojfroy Li&ce^pede; Corydoras nmhiacus Cope. 

 Locality: Jose Fernandez. 



22. Corydoras trilineatus Cope. 



Corydoras agassizii Steindachuer. 



23. Corydoras acutus Cope. 



24. Corydoras amphibelus Cope. 



25. Corydoras hastatus sp. nov. 



Types. No. 7747, two specimens .022 m. Villa Bella. Prof. L. 

 Agassiz. 



Compressed, comparatively slender. Head as deep a& 

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

 occipital process triangular; fontanel elongate, extending 

 into the occipital bone; preorbital small. 



Eye large, 1| in the snout, 3| in the head, 2 in the inter- 

 orbital. Snout little decurved; rictal barbels not extend- 

 ing bevond 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 two 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 i& 

 bordered posteriorly with white, itself narrowly mar- 

 gined with blackish, the caudal dusky beyond; a jet 

 black line extends on either side from a short distance 



