432 PROCEEDINGS OF THE ACADEMY OF [Oct. 



mandibulars large and powerful in front. A small basal maxillary tooth 

 inside. Tongue flattened, rounded and a little free. Interorbital 

 space convex. Gill-opening extending forward not quite opposite end 

 of maxillary. Rakers 9 + 12?, lanceolate, and shorter than filaments 

 which are f of eye. Each scale with a few striae. Tubes of lateral line 

 simple. Vent close in front of anal. Color in alcohol pale brown, 

 back a little darker than sides and lower surface with more or less 

 silvery reflections. A silvered streak from humeral region, including 

 rather vertical dusky-brown humeral blotch, to caudal, where it 

 becomes dark brownish and continues out on median rays. Fins all 

 dull or pale uniform brownish. Iris brassy-brown. Length 2|i 

 inches. 

 Astyanax moorii (Boulenger). 



Tetragonopterus moorei Cope, Proc. Amer. Philos. Soc. Phila., XXXIII, 



1894 (January 5), p. 107. Near Chapada, in Matto Grosso, from the 



headwaters of the Paraguay. H. H. Smith. 



Head 3f ; depth 3; D. iii, 9; A. iv, 28, i; scales 37 in lateral line to 

 base of caudal, and 3 more on latter; 9 scales obliquely from origin of 

 dorsal to lateral line; 7 scales from origin of anal to lateral line; pectoral 

 11 in head; ventral If; snout 3| in head measured from tip of upper 

 jaw; eye 3f ; maxillary 2; interorbital space 3. Body elongate ovoid. 

 An obtuse median predorsal keel, also one on postdorsal and post- 

 ventral regions, preventral region rounded. Head rather short, deep, 

 compressed, muzzle blunt. Mouth a little inclined. Maxillary reaches 

 middle of eye and its expansion f of same. Maxillary with several 

 basal teeth. Tongue fleshy, little free. Interorbital space convex. 

 Opercle deep, and second infraorbital with rather indistinct strise. 

 Gill-rakers 10 + 12, shorter than filaments, which are f of eye. Each 

 scale with a few striae. Tubes of lateral fine simple. Color in alcohol 

 brown, more or less with dull silvered reflections. Lower surface paler 

 or duller brownish than back. A blackish humeral blotch larger than 

 orbit. Side with a broad grayish diffuse streak from gill-opening 

 above towards base of caudal. In latter region this grayish shades 

 into dusky or blackish and extends out on median caudal rays. Fins 

 otherwise all pale brownish, dorsal and caudal a little darker. Jaws 

 a little brownish in front. Iris light brown with a dark brown jing. 

 Length 4^ inches. 

 Astyanax bimaculatus (Linnseus). 



Tetragonopterus caudimaculatus Cope, Proc. Amer. Philos. Soc. Phila., 



XXXIII, 1894 (January 5), p. 107. Headwaters of the Tocantius. H. 



H. Smith. 



Head 3^; depth 2f ; D. iii, 9; A. iv, 31, i; scales 40 in lateral fine to 



