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Updated: July 5, 2025
Some observations of mine on a species of Orni-thomyia a fly parasitical on birds might possibly be of use in considering the question of the anomalous position in nature of insects possessing the instincts and aptitudes of parasites, and organs manifestly modified to suit a parasitical mode of life, yet compelled and able to exist free, feeding, perhaps, on vegetable juices, or, like the ephemerae, on nothing at all.
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