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a genus of flies, the horse botflies, the larvae of which develop in the gastrointestinal tract of horses and may sometimes infect humans.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


A genus of botflies belonging to the family Oestridae, order Diptera. The larvae infest horses.

Gasterophilus hemorrhoidalis

A species that infests the noses of horses.

Gasterophilus intestinalis

A species that infests the stomachs of horses.

Gasterophilus nasalis

The chin fly, which lays eggs on hair shafts on the lower lip and jaw of horses.
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