47l> CALIFORNIA ACADEMY OF SCIENCES. 



yond the eye; lower lip ending in two small barbels. 

 Breast and belly entirely covered with skin. 



Dorsal fin when depressed reaching the adipose fin. 

 A rather broad naked area between the dorsal and adi- 

 pose fins. 



Brown; a series of large dark spots along the sides, 

 with a corresponding series of smaller spots on the back 

 and below; center of the lower fins blackish; caudal and 

 dorsal fins marbled with dark. 



Head 3; depth 2|; D. I, 7; A. 7; Lat. pi. ff. 



Three specimens .02 m. Uraguay. Professor Wyman. 



463. Gorydoras punctatus, 



Cataphractus />it>i<'futnx Bloch, pi. 377, tig. 2; Bloch & Schneider, 



"Syst. Ichthyol. 108," 1801; Lacepede, Hist. Nat. Poiss. v, 125, 



1803 (Surinam). 

 Hoplisoma punclata Swainson, Nat. Hist. Fish. etc. ii, 304, 1839 



(name only). 

 Callichthys punctatus Giinther, Cat. Fish. Brit. Mus. v, 329, 1864 



(Essequibo). 

 Corydas punctatus Eigeum. & Eigenm. Proc. Cal. Acad. 2d Ser. i, 



166, 1888 (Jose Fernandez). 



Corydoras ge.o/roy Lacepede, Hist. Nat. Poiss. v, 147, 1803 (loc.?). 

 Corydoras ambiacus Cope, Proc. Acad. Nat. Sci. Philad. 1871, 280 



(Ambyiacu River). 

 Gasterodermus ambiacus Cope, Proc. Am. Philos. Soc. xvii, 1878, 



681 (Nauta). 

 Habitat: Guiana; Solirnoeus and Maranon. 



Corydoras ambiacus Cope, is probably the male of punc- 

 tatus. The description of that species agrees with the de- 

 scription given by Giinther and with our specimens. 



Short and deep; head as deep as long; profile very 

 steep, rounded above and in front of the eyes; fontanel 

 elongate, extending into the occipital bone; the width 

 of the occipital equals its length to the tip of the process, 

 its margins regularly concave. A conspicuous mucous 

 canal extends from the anterior nares back and down 

 behind tlio eye. 



Eye large, H in the snout, 3J in the head, 1-jf in the 



