go here Biting midges can be a nuisance to campers, fishermen, hunters, hikers, gardeners, and others who spend time outdoors during early morning and evenings, and even during the daytime on cloudy days when winds are calm.
They will readily bite humans; the bites are irritating, painful, and can cause long-lasting painful lesions for some people.
A common observation upon experiencing a bite from this insect is that something is biting, but the person suffering can not see what it is.
Biting midges are sometimes incorrectly referred to as sand flies. Sand flies are insects that belong to a different biological group and should not be confused with the biting midges.