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*Infestation is largely confined to the Northern Hemisphere
*Infestation is largely confined to the Northern Hemisphere
=='''Hypoderma bovis'''==
==Identification==
''H. bovis'' are 15mm in length, and have a bumble-bee appearance. The abdomen is yellow, and there is a band of black hairs located down the middle.
Large 13-15mm long.
==Life Cycle==
''H. bovis'' lays single eggs on hairs around the lower legs of the host. The larvae develop and enter the body through the skin, where they migrate to the epidural fat found along the thoracic and lumbar vertebrae of the spine. The larvae stay here for the duration of the winter.
The larvae are palpable as distinct swellings, known as warbles.
=='''Hypoderma lineatum'''==
==Identification==
''H. lineatum'' are 13mm in length, and like ''H. bovis'' have a bee-like appearance.
==Life Cycle==
The eggs are laid in rows of around 6 on single hairs. The eggs then penetrate the skin and move along the connective tissue toward the diaphragm. They will continue to migrate, until they reach the oesphagus where the larvae will spend the duration of the summer.