Haematopota pluvialis male · žabalis ♂ ^Thumbnails»Haematopota pluvialis male · žabalis ♂^Thumbnails»Haematopota pluvialis male · žabalis ♂^Thumbnails»Haematopota pluvialis male · žabalis ♂

Haematopota pluvialis male · žabalis ♂

EN · common horse fly, notch-horned cleg fly, cleg
DE · Regenbremse
LT · paprastasis žabalis
LV · aklenis, parastā lietene
PL · jusznica deszczowa


Haematopota pluvialis and Haematopota crassicornis are very similar. The males of both species have eye-bands that stop halfway up, while females of both species have eye-bands over the whole of the eyes. However, males of H. pluvialis have an orange third antennal segment. H. pluvialis has brown mottled wings whilst those of H. crassicornis are generally grey.

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.
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