1878.] 
699 
[Cope. 
vian portion of its course. This list is obviously only provisional, as explo- 
ration of the Amazonian basin has not progressed sufficiently to enable us 
to assert the restricted distribution of any type. 
Thus the genus Otocin- 
clus Cope, first obtained from the Peruvian Amazon, has been ascertained 
by Steindachner to occur near Rio Janeiro. Zathoraz and Triportheus first 
determined from western species, occur on the Lower Amazon. The genera 
remaining are : 
III. Siluride; Brochis Cope; Chenothorax Cope; Physopyzis Cope ; 
Agamyzxis Cope; Pariolius Cope. 
Characinide ; Aphyocharux Gthy.; Iguanodectes Cope; Stethaprion Cope. 
Finally, the species which have not yet been found below the Peruvian 
boundaries are as follows. I include species previously described by myself 
from Pebas, in the essay on The Fishes of the Ambyiacu River,* also 
those described by Gill from Orton’s first collection, and by Gunther from 
those of Bartlett, 
IV. Silurid@.... ccc cee cone 44 
Pseudorhamdia Blk........... 1 
Pimelodus Lac... ............. 4 
Euanemus M. T............... £ 
Epapterus Cope................ 1 
Anchenipterus U. V............ 3 
Centromochlus Kner........... 1 
Doras: La )..s.06 cee sag saass ede 1 
Zathorax Cope.........eee eee 2 
Agamyxis Cope.............. 1 
Physopyxis Cope.............. 1 
Dianema Cope.........------- 1 
Brochis Cope...............04- 2 
Chenothorax Cope...........- 2 
Gastrodermus Cope..........+. 5 
Hypoptopoma Gthr............ 3 
Otocinclus Cope.........-..6+: 1 
Liposarcus Gthr........-.. 000. 3 
Plecostomus Art .........+.005 3 
Chetostomus Heck............ 5 
Pariolius Cope...............- 1 
Trichomycterus..............- 2 
ASPrediNid@. 66. .cecerecees 3 
Bunocephalus Kner........... 2 
Dysichthys Cope.............. 1 
Characinid@. .......00ec eens 53 
Anodus Spix- -nceceews sss csons 2 
Curimatus Cuv.............00. 5 
Prochilodus Agass.... ........ 2 
Reeboides Gthr.............005 3 
Anacyrtus Gthr...... 0.0.0... 3 
Xiphorhamphus M. T.......... 2 
Hydrolycus M. T............4. 1 
Xiphostoma Spix.............. 1 
Characidium Reinhd.......... 2 
Aphyocharax Gthr............ 2 
Schizodon Agass.............. 1 
TIguanodectes Cope ............ 1 
Odontostilbe Cope............. 1 
Leporinus Spix.... ........... 3 
Hemigrammus Gill............ 1 
BryconwM Vi. scdinannicere 4 
Tetragonopterus Cuv.......... 6 
Triportheus Cope........... wwe 
Stethaprion Cope.............. 2 
Chalceus Cuv..... see eee ceeee 1 
Serrasalmo Lacep............. 2 
Metynnis Cope........ .....--- 1 
Myletes Cuv........ seeseeeee 3 
Pyrrhulina C. V...... 200-55 1 
Holotaxis Cope......--....-206 2 
Chromidid@.... cccecceeceee 10 
Acatta, Heck s:si.0 eves eeeiisweus 6 
Geophagus Heck.............. 1 
Crenicichla. Heck. ............. 3 
Total number of specics not yet 
known below the Peruvian 
AMaZONesacauencewntsssst4 120 
«Proceed. Philada, Academy, 1872. 
