Although small, these Horseflies pose a serious threat to livestock as well as humans. Both the male and female of most of the Hybomitra have three stripes on each eye as shown in the second picture above. The wing is clear behind the sub-apical spot up the wing margin. Chrysops relictus flies from mid-May to mid-September peaking in late June and July. The flight period of Hybomitra ciureai is mid-June to mid-August. It is found through most of Europe and in Russia, Mongolia, China and Japan. The males have hairy eyes but those of females are weakly haired or bare and there is a raised ocellar tubercle. There are approximately 3000 species of horseflies around the world, of which about 350 are found in North America alone. In life the eyes of Tabanus sudeticus are blackish-brown with a coppery sheen. The increased stress load can quickly compromise the health of an animal. Haematopota pluvialis can be found in a wide range of habitats from May to October. The front corners of tergite 2 are pale yellow with yellow hairs The overall appearance is rather variable ranging from a yellowish form to a blackish form. The antennae have four terminal segments, or fewer making a total of not more than seven antenal segments. Most horse flies and deer flies are found in brushy or low lying pasture areas near creeks, streams or tanks that provide damp soils in which the immature stages develop. Horse and deer flies belong to the same family. Tabanus sudeticus is a very large rather dark species (body length about 25 mm) with small equilateral pale median abdominal triangles which do not reach the foregoing tergites, and (usually) little or no lateral reddish colour on the abdomen. They are a bit larger than house flies and slightly rounder as well. Horse Fly Identification. 2. The other names by which they are known include breeze fly, forest fly, ear fly, or deer fly. Hybomitra distinguenda is a common species throughout Europe inhabiting various types of biotypes. Humans can also make use of repellents during the summer to protect themselves from horse fly attacks. Horse fly, any member of the insect family Tabanidae (order Diptera), but more specifically any member of the genus Tabanus. The facets in the upper two thirds of the compound eye of the male are, with the exception of those on hind margin, at least four times the size of the rest. Hybomitra distinguenda (Yellow-horned levels horsefly). Adult black, including wings, or nearly black, brown-purple. Horse flies are dark in color often appearing almost black (above right) while deer flies [ picture of deer fly] are somewhat smaller and more colorful. If I am a male adult, I will only drink nectar from flowers or juices from fruit. March Fly (Tabanidae family ) March Flies (also known as Horse Flies) are large strongly built flies with large eyes - the male's eyes meet in the middle. 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