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Updated: May 29, 2025


Habitual evils are those which are least felt; and men born in America do not suffer the same intensity of pain as Europeans recently arrived. Perhaps, also, the destruction of forests round the inhabited places, although slow, will somewhat tend to diminish the torment of the tipulary insects.

In descending great rivers, the rowers take the middle of the current, where there are few mosquitos; but in ascending, they are obliged, in order to avail themselves of the dead waters and counter-currents, to sail near the shore, where the proximity of the forests, and the remains of organic substances accumulated on the beach, harbour the tipulary insects.

The night was extremely dark, and we could not in less than two hours reach the village of Maypures. We were wet to the skin. In proportion as the rain ceased, the zancudos reappeared, with that voracity which tipulary insects always display immediately after a storm.

It was believed that the pines and ranunculuses, the stags, the rats, and the tipulary insects of the north of Europe, were to be found in Japan, on the ridge of the Andes, and at the Straits of Magellan.

These rivers, like the Orinoco, cross thick forests, but the tipulary insects, as well as the crocodiles, shun the proximity of the black waters. Possibly these waters, which are a little colder, and chemically different from the white waters, are adverse to the larvae of tipulary insects and gnats, which may be considered as real aquatic animals.

Satisfied with our observations, we left the rock of Culimacari at half past one on the morning of the 12th. The torment of mosquitos, to which we were exposed, augmented in proportion as we withdrew from the Rio Negro. There are no zancudos in the valley of Cassiquiare, but the simulia, and all the other insects of the tipulary family, are the more numerous and venomous.

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