406 MEMOIRS OF THE CARNEGIE MUSEUM 



series of teeth ; several of those near the anterior end are canines, of which the third 

 from the end is largest. Sides of lower jaw with minute teeth, a large conical tooth 

 at the outer corner of the jaw, followed forward by four teeth decreasing in size, 

 the median tooth again a large canine; predorsal area scaled. 



260. Heterocharax macrolepis sp. nov. (Plate LXI, fig. 2.) 



Type, 46 mm. to base of caudal. Rockstone. (Carnegie Museum Catalog 

 of Fishes No. 2142.) 



Cotypes, three specimens, 38-42 mm. Rockstone. (C. M. Cat. No. 2143a; 

 I. U. Cat. No. 12318.) 



Cotype, one specimen, 37 mm. Wismar. (C. M. Cat. No. 2144a.) 



Head 3.6-3.9; depth 2.75-3; D. 10 or 11; A. 37 or 38 (or 42 in the Wismar 

 specimen) ; scales 6 or 7-37 to 40-5; eye .5 in snout, 2.3 in head, .5 in interorbital. 



Slender, profile without notable hump or depression ; occipital process extend- 

 ing less than one-fourth the distance to the dorsal; prevcntral area flat, post- 

 ventral area trenchant; maxillary not reaching to the end of the first suborbital; 

 cheeks entirely covered by the second suborbital; distance from tip of snout to 

 end of maxillary equal to distance from tip of snout to middle of eye. Gill-rakers 

 7 + 12. 



Scales regularly imbricate, not notably decreased toward the predorsal area; 

 a median series of about nine scales in front of the dorsal ; about two pairs of scales 

 between the occipital process and the median series; scales with from two to seven 

 radiating striae. Fins naked. 



Origin of dorsal equidistant from snout and caudal; highest dorsal ray 4 in 

 the length; origin of anal a little farther from snout than origin of the dorsal; 

 ventrals reaching anal; pectorals to the ventrals. 



Silvery, without distinct spots. A dark streak along the sides and along base 



of anal. 



Subfamily Acestrorh yn cm n m . 



Acestrorhynchus Eigenmann. 



Xiphorhynchus Agassiz, Selecta Gen. et Spec. Pise. Bras., 1829, 76 (falcatus). 



Xiphorhamphus Muller and Troschel, Horse Ichth., I, 1845, 17 (falcatus). 



Acestrorhynchus Eigenmann, Smiths. Misc. Coll., Quarterly Issue, XLV, 1903, 146 



(falcatus). 



The name Xiphorhynch us is preoccupied by Swainson's genus of birds, proposed 

 in 1827. Xiphorhamphus is preoccupied by Blyth's genus of birds in 1843. 



Type, Salmo falcatus Bloch. 



