COLLECTION OF FISHES FROM BUENOS AIRES 453 



white ; dorsal short, its origin over some part of the last third of 

 the ventrals, a little nearer caudal than tip of snout. Scales 

 caducous, crenulate. 



A dark band along the entire back, median predorsal line 

 free from pigment ; a faint dusky streak along the upper part 

 of the side to the middle of caudal ; no humeral spot ; upper 

 lip black, tip of snout and lower jaw dusky ; sides of head and 

 body without pigment cells. 



The reproductive organs indicate that the larger specimens 

 are mature. 



Type in Mus. Princeton Univ., a specimen 85 mm. long, 

 from Buenos Aires; coll. Prof. W. B. Scott. Cotypes in the 

 collections of Princeton and Indiana Universities (No. 11364, 

 Mus. Ind. Univ.), 14 specimens 58 to 85 mm. long, from same 

 place. 



STOLEPHORID^). 



Ilisha flavipinnis (Valenciennes). 



Two specimens. 

 Stolephorus olidus Gtinther. 



Seven specimens. 



Upper margin of silvery band well denned, the lower margin 

 not, the silvery area in the adult covering the entire sides. Anal 

 about 26; depth about 5.5 (4.5 in the types). 



MUGILID^. 

 Mugil platanus Giinther. 



Five specimens. These agree with Giinther's description, 

 except that in the three better preserved specimens and the 

 smallest the upper half of the base of the pectoral is black, the 

 rest of the fin uniform. 



ATHERINID^. 

 Atherinichthys bonariensis Cuvier & Valenciennes. 



Four specimens. 

 Atherinichthys argentinensis Cuvier & Valenciennes. 



Origin of spinous dorsal behind anus. A. 1, 15 ; scales 50, 

 8 between dorsal and anal ; depth 6.5 to base of caudal ; head 

 4.33 ; scales rounded behind; pectorals equal head less mouth ; 

 lateral band one sixth depth of body. 



