Collected by Charles Frederick Hartt. 285 



This species may prove to be identical with T. macidatus 

 lacustiHs Liitken. 



I((('i(stris. jacuhif')i><i.s. 



Head 4]. Head 4. 



Depth 2i Depth 2\. 



A. 24-3-3. A. -27-28. 



Scales 6-34-36-6 to 7. Scales 6 to 7-36-6J. 



Eye 3 in head. Eye 4 in head. 



Humeral spot longitudinally ovate, Humeral spot vertically elongate, 



pale area surrounding it, not bor- situated in the centre of a pale area 



dered posteriorly by vertically curved which is l)ounded posteriorly by a 



border. vertically curved border. 



99. Tetragoiiopterus ilieriiigii Boulenger. 

 Ann. Mag. Nat. Hist., 17-2, 1887 (Rio Grande do Sul). 

 Tetmgonopterus ohscKrus Eigenm. (notHensel), Ann. N. Y. Acad. Sci., 1894 



(Rio Grande do Sul). 



Tctmgonopti'rm pliodus Cope, Proc. Am. Philos. 8oc. XXXIII. , 90, 1894 

 ( Rio Grande do Sul ) . 



Tetragonopterus pliodus cope is unquestionabl3^ identical with 

 specimens sent b^^ Dr. von Ihering to Indiana University from 

 Rio Grande do Sul. On comparison of these specimens, which 

 were identified hy Dr. Eigenmann as T. ob.scuriis, with the de- 

 scription of T. ilieringii there remains little doubt but they be- 

 long to the species described b}- Boulenger. The faint caudal 

 and humeral spots almost disappear in some specimens. I have 

 therefore placed pliodus in the synonom}' of iheringii. 



100. Tetragoiioi>tei'ii!>» or!>ite(lii Liitken. 



Yidensk. Medd. Nat. For. Kjol)., -229, 1874 ( Kio 8. Jiian, Central Amer.). 

 Habitat: — Rio S. Juan, Central America. 



101. Tetragonopterus uiiiliiieatus Gill. 



Pfecihirichflii/s Jf(iiiii/triin)iiiis iDii/ineafus (Jill, Fresh Water Fishes Trinidad, 

 60, 185S ( Trinidad ); Ciiinther, Cat Fish. Brit. Mus., Y., 317, ls64. 



Tetragonopterus unilineatKS Eigenm & Eigenm., Proc. U. S. Nat. Mus., 

 XI Y, 54, 1891. 



Habitat: — Trinidad; Para; Brazil. 



Brazil, scA^en specimens, the color of body very dark silver}-. 



Para, fifteen specimens. 



102. Tetragonopterus elegans Steindachner. 



Flussfische Siidamerika's, lY., 36, ])1. YIL, tig. 4, 1SS2 (Obidos) ; Eigenm. 

 & Eigenm., Proc. V. S. Nat. Mus., XIY., 53, 1891. 

 Habitat : — Obidos. 



