Cattle warble fly (Hypoderma)
Larva — Diptera
Identification key : 
Maggot (fly larva) (Larva) 
Flies (brachyceran Diptera) (Adult (and nymphs resembling the adult))
Scientific name : Hypoderma bovis
Other names : cattle grub
Fly whose larvae migrate through the body of cattle and form swellings under the skin of the back, from which they emerge at the end of their development.
Source : Wikipedia — Hypoderma bovis — Wikipedia
This page lists the bio-preparations in the collection that other references associate with this opportunist: Cattle warble fly (Hypoderma).
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