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balloon fly

any member of a family of flies in the insect order Diptera that are named for their swollen abdomen. It is also characterized by an extremely small head and a humped back. Some adults have a slender proboscis (feeding organ) and feed from flowers, whereas others lack a proboscis and probably do not feed in their adult stage. Eggs are laid on leaves and flowers. Upon hatching, the larvae are small and flat. They eventually come in contact with a spider that they board. They then burrow into the spider's body, where they feed as internal parasites.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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