284 



The South American Characinidse 



Ttiragonoptcni.'i rintlaris Liitkeii, Overs. Dan. Selk., No. 3, 132, 1874 (Kio 

 das Velhas and affluents); id, Velhas-FIodens Fiske, XIII., 215. pi. V., figs. 

 13 and 14, 1875 (Rio das Velhas). 



Tetriigonnpfcntu rif/ciiinrniiiiondii Cope, Proc. Amer. Philos. Soe., XXXIII., 

 89, 1894 (Rio Grande do Siil). 



Tetragonoptenis laticeps Cope. 



A comparison of the excellent description and plate of eigen- 

 manniorum with numerons specimens from Rio Grande do Sul 

 leaves little doubt but that this is one of the variations of fasci- 

 atiis. T. laticeps. which is also very well described and flgitred 

 may prove to be the same ; the only character that separates them 

 is the absence of maxillar}' teeth in laticeps, but the single tooth 

 that is sometimes present in the maxillary of fasciatus may very 

 readily be mistaken for an inter-maxillary tooth. 



The following table has been compiled to show the extent of 

 the known variations of the species : 



cigenmannioru m. 



Scales 7-32 to 36-6 



D. 11 



A. 23 to 24 



Head 4 



Eye 3 in hea<l=iu- 



terorbital. 

 Depth 2}i 

 No maxillary teetli 



laticeps 

 6-37-4>^ 

 D. 11 

 A. 20 

 3.75 to 4 



(Eigenm). 

 fasciatus. 



(Steind). 

 fasciatus. 



(Liitken). 

 rividaris. 



(> or 7-32 to 36-4 to 6 6}'2, 38 to 40-5 5 to 6-33 to .38-6 or 



D. 11* 



A. 2 or 3, 19 to 25 

 4 

 3 to 31^ L 2%-4 



interorbital. 

 2.6 2V.^-3 



No max. Max. 1-3 teeth, 

 teeth. 



I). 10 

 A. 18-20 



3 



D. 11 

 A. 19-20 

 4 

 3 



2%-3 



Max. teeth 1-3. 



I 



Habitat : — Brazil ; British Guiana. 



97. Tetragoiioptei'iis fasciatus intemipta Liitken. 



Tetragonoptcnix rirulaiis infcrnqtla Liitken, Velhas-FIodens Fiske, XIII., 

 215, 1875; Eigenm., Ann. X. Y. Acad. Sci., 1894 (Rio Grande do Sul). 



TctragoiKijjteruN liitken ii Boul. Ann. Mag. Nat. Hist., 1887 (Rio Grande do 

 Sul). 



The description of lutkenii leaves little doubt but that it is 

 identical with specimens in the museum of Indiana University 

 from the Rio Grande do Sul. These specimens are in all proba- 

 bility the T. rividaris of Liitken which has an interrupted lateral 

 line. 



98. TetragoiiO]>teriis jaculiieiisis Cope. 



Proc. Amer. Philos. Soc., XXXIIL, 88, 1894 (Rio Grande do Sul). 



*Tlie number 10 in Eigenmanu, Ann. N. Y. Acad. Sci., VII., 624, 1894, 

 should he 11. 



