560 PROCEEDINGS OF THE ACADEMY OF [Oct., 



Head 3f to 3|; depth 3 to 3^; D. ii, 7 or ii, 8; A. iii, 24, i to iii, 

 27, i; scales 34 to 36 in 1. 1. to caudal base and 2 or 3 more on latter; 

 6 scales above 1. 1.; 5 scales below 1. 1. to anal origin; 12 or 13 pre- 

 dorsal scales; snout 3| to 3f in head; eye 2^ to 2|; maxillary 2} to 

 24; interorbital 2f to 2f ; length 24 to 33 mm. 



Closely related to the preceding specie-, though apparently differs 

 in the smaller head and deeper body. 



(Named for Mr. Edgar A. Smith.) 



CHALCIN.E. 

 Chalcinus angulatus (Agassiz). 



Five from the Falls of Guajaramirim, Madeira River, approxi- 

 mately Lat. S. 10° 47', Long. W. 65° 23', Brazil. September, 1912. 



One young example from the Madeira River near Porto Velho, 

 Brazil. January-February, 1913. 



GASTEROPELECIN.E. . 

 Gasteropelecus securis Filippi. 



One from the Madeira River, about 200 miles east of W. Long. 

 63° 54', Brazil. September, 1912. 



Five from tributary of Madeira River near Porto Velho, Brazil. 

 January-February, 1913. 



These specimens all appear to be identical with Filippi's account.^ 

 They also agree with examples I have studied, from Pebas and the 

 Ambyiacu River, as Gasteropelecus stellatus Kner,'" and thus fall 

 within my subgenus Thoracocharax. - 



GNATHOCHARAX gen. nov. 

 Type Gnathocharax steindachneri sp. nov. 



Body elongately ovoid, profiles unlike anteriorly, upper straight 

 and lower convex. Preventral with median keel, over which scales 

 pass. Head rather upturned. Snout short, broad. Eye very 

 large, with free eyelids. Mouth terminal above. Maxillary very 

 oblique, elongate. Teeth uniserial in jaws, none on maxillary and 

 mandible with several canines. Mandible slightly project?. Inter- 

 orbital low. Gill-rakers lanceolate, 3+9, long. Scales large, 

 cycloid. Caudal and anal bases scaly. Lateral line incomplete, 

 only on few scales from shoulder. Dorsal inserted posteriorly, 

 moderate. Adipose fin placed over last anal rays. Anal long, 



^Rev. Mag. Zool, 1853, p. 165. Rio Napo. 

 ^^Proc. Acad. Nat. Sci. Phila., 1906, p.. 4.52. 



