FROM PAEA TO MANAOS. 159 
t 
a supposer que cette localite renferme aussi les cinq espeiees 
de Breves. Yous vo} r ez que nous laisserons encore e'nonne'- 
ment a faire a nos successeurs. 
Adieu pour aujourd'hui, votre bien affectione* 
L. AGASSIZ.* 
* August 22d, morning : between Tajapurii and Gurupl. 
MY DEAR FRIEND : Yesterday was a most instructive clay, above all, in 
the "forest fishes." "We have obtained fifteen species in all. Out of this num- 
ber ten are new, four are found also in Para, and one has been already described 
by me in the voyage of Spix and Martins ; but what is most interesting is the 
proof furnished by these species, taken in their totality, that the fishes inhabit- 
ing the waters west of the group of islands called Mnrajd, when considered as 
a whole, differ from those of the Para river. The list of names which \ve 
have asked from the Indians shows, further, that the number of species found 
in these localities exceeds greatly that which we have been able to procure ; 
for this reason we have left cans at Breves and at Tajapurii in order to complete 
'the collection. I add some remarks which will help you to appreciate these 
differences, if you wish to compare them with the catalogue of the Para species 
which I left with you. Considering all, it seems to me already apparent that 
our voyage will make a revolution in Ichthyology. In the first place, the 
Jacunda of Tajapurii is different from those of Para ; so is the Acara ; then 
we have a new species of Sarapo, and also one of Jeju ; a new species of Rabeca, 
a new species of Anoja, a new genus of Candiru, a new genus of Bagre, a 
new genus of Acary, and a new species of Acary belonging to the same genus 
as that of Para ; also a new species of Matupirim. Add to this a species 
of Aracii, already described, but which is not found at Para, and you will 
have at Tajapurii eleven species which do not exist at Para, to which must 
be added four species which are found at Tajapuru as well as at Para, and one 
which occurs at Para, Breves, and Tajapuru. In all twenty species, of which 
fifteen are new, in two days. Unhappily, the Indians have misunderstood our 
directions, and have brought us but one specimen of each species. There 
remains, then, much to do in these localities, judging from the catalogue 
of names collected by Major Coutinho, which includes twenty-six species from 
the forest and forty-six from the river. We are still lacking at least fifty-two 
species from Tajapuru, even supposing that this locality contains also the five 
species from Breves. You see that we shall yet leave a large share of the 
work to our successors. 
Adieu for to-day, your affectionate 
L. AGASSIZ. 
