The way they do this is 28 Years Tyler Skaggs 1991 2019 thank you for the memories shirt. A lot of species do lay their eggs on the host directly, but a lot of the host species have learned to recognises their own species of botfly, and will run away when they approach. So a lot of botflies use what is called an intermediate vector- they lay their eggs on another animal which will reliably land on the desired host. Dermatobia hominis uses a mosquito, or sometimes a tick. Some species develop in the gut, so they’ll position the eggs near an orifice or somewhere they know the host will lick.
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Horses, for example, tend to itch their noses against their front knee if you think about 28 Years Tyler Skaggs 1991 2019 thank you for the memories shirt, it does make sense, so the equine botfly lays its eggs there. When the horse itches its muzzle, the larvae crawl up its nose. Most species, however, develop beneath the skin- so when the egg hatches, the larvae just burrow in. Note the ruler for scale. This is not a small maggot. Imagine having a load of them growing under your skin! Those black dots are spines, by the way- they point backwards to stop the maggot being pulled out.