These horse flies can be encountered during the daylight hours from late May through late October. The males are harmless and feed on nectar, while the females feed on mammal blood, mainly cattle and horses, needing blood for developing eggs. When they bite they inject fluids inhibiting the coagulation of blood, which flows out in such a way that allows the horsefly to lap it. They are also able to bite humans painfully. Females lay their eggs at the base of grass-stems or on the surface of moist soil with a high preference for undisturbed old-field-pasture which has not been ploughed or fertilised. The larvae develop as predators in soil.
email address (visible to admins only) :
comment (mandatory) :
built on Piwigo | mobile