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Many of the hematophagic (blood-eating) species are pests in beach or mountain habitats. Some other species are important pollinators of tropical crops such as cacao. The blood-sucking species may be vectors of disease-causing viruses, protozoa, and filarial worms. The bite of midges in the genus Culicoides causes an allergic response in equines known as sweet itch. In humans, their bite can cause intensely itchy, red welts that can persist for more than a week. The discomfort arises from a localized allergic reaction to the proteins in their saliva, which can be somewhat alleviated by topical antihistamines.
Fine, great, now you know all there is to know about them, only you can't immediately identify the species and sub species, but who cares? What you really want to know is: WHEN WILL THEY LEAVE ME ALONE???
According to local lore, they disappear near St. John's Day (San Juan), which is on June 24 (that's next Friday!!). There is no guarantee that the blasted insects can read a calendar but you will notice at some point, maybe a day or two after San Juan, that you don't notice them any more.