Cope.] ^^ [Jan. 5, 



length without caudal fin. Length of head 3.8 times in the same. Eye 

 three times in head ; exceeding length of muzzle and equal interorbital 

 width. Dorsal fin elevated, narrow ; pectorals narrow, covering basal 

 third of ventrals ; ventrals lauciforni, reaching fourth anal ray. Color sil- 

 very, with an ill-defined silver lateral band. An obscure postclavicular dark 

 spot, and some obscure dark dots on the silver lateral band. No basal 

 caudal spot. 



Length to end of middle caudle radii, 80 mm. ; length to base of caudal 

 fin, 72 mm.; length to base of anal (oblique) 35 mm.; length to base of 

 ventrals, 26 mm.; length of head, 20 mm. 



A single specimen from the Jacuhy. Besides the generic characters, 

 the scales are larger than in the known species of Anacyrtus. 



Chorimycterus tenuis Cope, Amer. Naturalist, 1894, p. 67. 



Char, gen — Denticulate teeth on intermaxillary and dentary bones, 

 and in a single row on the former. On the dentary bone a second inte- 

 rior series of simple teeth. Dorsal and anal fins short ; the former com- 

 mencing in front of the base of the latter. Nares separated by a wide 

 space. Lateral line complete. 



This genus is near to Characidium, but difi'ers in having two series of 

 mandibular teeth. From Piabucina it difters in the separated nostrils and 

 the presence of a lateral line. 



Char, specif. — Form slender ; the depth contained seven times in the 



length less the caudal fin. Profile of muzzle decurved ; mouth small, the 



end of the maxillary nearly reaching the anterior margin of the orbit. 



Eye large, oval, contained in the length of the head three times, and as 



wide as the interorbital space opposite its posterior border. Teeth of both 



jaws rather elongate, with a single lateral denticle on each side of and 



near the acute apex. Length ot head five times in total length without 



3 

 caudal fin. Scale jjg]. Fin radii, D. 11 ; A. 9 ; V. 9 ; P. 12. Pectorals 



2 



elongate, not reaching ventrals ; ventrals reaching about half-way to 

 anal. Caudal fin deeply emarginate. Color silvery, most brightly on 

 the suborbital and opercular i"egions. Scales with slightly shaded 

 borders. 



Total length, 66 mm. ; length to base of caudal fin, 55 mm. ; length to 

 base of anal, 41 mm.; length to base of ventral, 27 mm.; length to base of 

 dorsal, 22 mm.; leng'.li of head, 11 mm. 



This fish is more slender than the Characidiam fasciatum of Reinhardt, 

 and has a different scile formula and coloration. It is still more slender 

 than the C. etheostoma Cope, and C. steindachnerii Cope. 



PsEUDOCORYNOPOMA. DORi^. Perugia, Anil. Mus. Genoa, x, 1891, 646. 

 Bergia altipinnis Steind., Stzber. K. Akad. Wien, 1891, 336. 

 Char. gen. — Dorsal fin originating above the anterior part of the elon- 

 gate anal fin. Denticulate teeth on the premaxillary and dentary bones. 



