Miscellaneous. 157 
the country is very sandy and dry, with a scrubby, shrubby vegeta- 
tion ; there are however some patches of forest, and in these, Lepi- 
doptera are rather abundant ; there are several lovely Hrycinide new 
to me, and many common insects, such as Heliconia Melpomone 
and 4graulis Dido, abundant, which we hardly ever saw at Para: 
Coleoptera I am sorry to find as scarce as ever. I hope however to 
do better at Montalegre, as the hills there are near a thousand feet 
high, and must I should think produce some. I wish to know what 
is thought of Cuyaba in the province of Matto Grosso as a locality ; it 
is at the head of the Tapajoz and Paraguay River ; there is a com- 
munication from here, salt bemg taken up. I could also from Rio 
Nigro get up the Madeira to Matto Grosso city, or up some branches 
into Bolivia. Is Bolivia at all known? I see in the Museum Cata- 
logue only five or six Erycinide from it, from Mr. Brydges’ collec- 
tions. I see there is a branch of the Andes in it the highest in 
America, and its capital cities appear higher ground than even Bogota 
or Quito. Hither of the localities can be I think quite as easily reached 
as the Andes up the Amazon ; at all events I should like to know if 
the ground is open and likely to be good, for some future time, if not 
just at present. I shall I think get up the Rio Nigro towards the 
sources of the Orinooko, but I am rather fearful that all N. Brazil 
is rather poor in Coleoptera. 
“September 14th.—I believe I shall now start for Montalegre 
tomorrow, having a canoe lent me ; I have however found so many new 
species of Lepidoptera, that I shall probably stay here a month on my 
return before going to Rio Nigro, unless indeed I find Montalegre so 
very good as to induce me to spend till December there. I do not 
think that you need send me anything till I write again. Pray write 
whenever you can, and give me all the information you may be able 
to obtain, both as to what things are wanted in any class or order and 
as to localities. 
“The Tapajoz here is clear water with a sandy beach, and the bathing 
is luxurious ; we bathe here in the middle of the day, when dripping 
with perspiration, and you can have no idea of the excessive luxury 
of it; the water is so warm that then is the healthiest time. Oranges 
are about fourpence a bushel here, and are far the best fruit ; large 
pineapples twopence to fourpence, but we seldom eat them. The 
more | see of the country, the more I want to, and I can see no end 
of, the species of butterflies when the whole country is well explored. 
Remember me to all friends.”’ 
1 am, Gentlemen, your obedient Servant, 
SAMUEL STEVENS. 
ON THE GENUS GREGORINA. 
M. L. Dufour has applied the name uf Gregorina to some micro- 
scopic organisms which live as parasites in the intestinal canal of 
some insects, especially of larve. M. Koelliker found that these 
creatures were composed of a single cell, and are as simple as some 
of the lower genera of plants. ‘Some objections urged against this 
monocellular nature, by Henle and Fantzius, have induced M. Koel- 
