Cope.] 698 [May 17, 
GENERAL OBSERVATION. 
The 121 species enumerated in the preceding pages are distributed 
among the following natural families. 
SVM bran Ghid eis. eo rnerue a sdagesoebwasaeewause se eedarney wincaniatel 1 
Hypophthalmide............. ne eRe A Aaiewns Gewese = a wag tonelavecasisiess 2 
Siluride........... Siteeoiay sess’ Seeinaw es F540 WARE RAS ox eae ka . 36 
ASPTCCINING siccwccc cuisine a oda enews oaks Utah aewarn es aeeaes 2 
SlErMOP VST 2c aca.g Nsstceds earceeeenata af Adee a Seda lopdnmbauacded eaves beacause 10 
Characinide.....0.......... seavdely Sb ae MeO See beanie ies 52 
OStCOPIOSSIN Bis Sonate Ger eeeksawonobek eseleecamiatmaedee ee eae ees 2 
CY PrinOd OMA is nwencadeies Raawe sks HeNeneale ea WaaneMek tuk dese vase 1 
Belonide:, v5 aaweons :6 24 dewadeeads pesca 4h be oe tee wea Sa eee Raneeees 1 
Tetrodontidees swscacide-ves ac aakeioa decode ae hese seer eit sesame 1 
Chromidides: vssies aseacs bc idencesee $e Staal Bua acvaeei nem aauai ac aee ok oon reas 13 
121 
The preceding families have all been known heretofore as occurring 
in the fresh waters of South America, so that an analysis of the contents 
of this catalogue must relate chiefly to the genera and species. In so 
doing I first point out two genera which are characteristically marine, which 
have been shown by Ginther and Steindachner to inhabit the Brazilian 
Amazon. I have proven that their distribution extends even to the Pe- 
ruvian Amazon, 2500 miles from the sea. They are: 
I. Belone L. Tetrodon L., represented by one species each. 
I next enumerate four species which are confined to the Alpine waters 
of the Amazon, having been brought by Prof. Orton from the elevations of 
from 10,000 to 11,400 feet. These are : 
II. Arges sabalo, C. V. 
Trichomycterus dispar Tsch. 
Trichomycterus gracilis C. V. 
Tetragonopterus tpanquianus Cope. 
These represent the two families of Stluride and Characinidea, which 
are distributed everywhere in the neotropical realm. Of the Charact- 
nide, Tetragonopterus is universally distributed Of the Siluride, Arges 
is Alpine, but whether found in the waters of the Pacific Slope as well 
as the Atlantic, I am not informed. The other genus, Trichomycterus, 
is Alpine and West Coast, occurring from Equador to Southern Chili. 
The two species enumerated above are the only ones from Atlantic 
waters yet known. ‘This is one of the few cases where a West Coast form 
crosses the great water-shed. It is well known that many genera are 
common to the waters of both coasts, and even, according to Giinther, the 
species Macrodon trahira. 
I next note the genera which have so far not been found on the lower or 
middle Amazon, and which may be regarded as characteristic of the Peru- 
