NO. 1556. LIST OF CHARACIN FISHES— EIGENM ANN AND OGLE. 27 



Scales 8-4:5-7; 8-40-6; 8-39-7; A. 29, 28, 29; head 3. 6 or 3.5; 

 depth 2.7-3; e}^^ hirge, 2.8-2.6 in head; interorbital 3.25 in liead; 

 maxillary long-, equal to eye, having two narrow teeth. 



Elongate, body deepest a little behind origin of pectorals; dorsal 

 placed behind the origin of ventrals, its origin equidistant from front 

 of eye and ])ase of middle caudal ra^^s. Highest dorsal ray equal to 

 head without opercle: pectorals reaching ventrals, ventrals to anal. 



A faint humeral spot; caudal spot distinct, not reaching end of 

 middle caudal rays. A silver^' lateral band. 



This species is closely related to fischi>ri, with which the specimens 

 were confounded. They differ in the smaller scales. 



Astyanax bimaculatus ( Linnaeus ) . 



No. 34437. Five specimens. Para, Brazil, presented by J. C. 

 Brevoort. 



No. 34453. One specimen, Para, Brazil, presented by J. C. 

 Brevoort. 



No. 34591. Five specimens (?), Brazil, presented by J. C. Brevoort. 



No. 36764. Five specimens, British Giiiana, British Museum. 



No. 44957. Four specimens, Lagoa Santo, Brazil, presented by Chr. 

 Liitken. 



Astyanax bimaculatus lineatus (Perugia). 



Nos. 1621, 1695, and 3065, and one without number; five specimens. 

 Paraguay, collected by Page. 



Astyanax orthodus Eig-enmann, new species. 



Type. — Cat. No. 55655, U.S.N. M. Specimen 92 mm. long to origin 

 of caudal, Truando, Colombia, Michler and Schott, collectors. 



This species is identical with Astyimax himaculatus in apparently 

 all characters except the teeth. In hvmaeulatas the teeth of the inner 

 series of the premaxillary are convex behind; the denticles correspond 

 to this convexity and are therefore arranged in a curve. This curve 

 varies from a crescent to U -shape in a specimen from Piracicaba. In 

 orthodus the anterior and posterior surfaces of the teeth are al'ke, the 

 denticles being arranged in nearly a straight line. These species differ, 

 therefore, as M'tcralestes differs from Myletes. 



Head 4; depth 2f ; D. 11; A. 33; scales 6-40-6 above ventrals, 8 

 above origin of anal. Dorsal and ventral profiles equally curved, the 

 ventral curve continuous, the dorsal profile very slightly concave over 

 the eyes; eye a little more than 3 in the head; interorbital 2i: maxil- 

 lary distinctly longer than in a specimen of hhnaculatus of the same 

 size, longer than eye, a little less than 3 in the head; maxillary with a 

 single tooth. 



In the position of the dorsal, equidistant from tip of snout and base 

 of upper caudal rays, and the position of the ventrals the specimen 

 agrees exactly with one of hlinaculatus of equal size from Rio Grande 



