Garden March Fly

Bibio hortulanus can reach a body length of about 6.5–8.5 millimetres (0.26–0.33 in). Wing length is of about 9.5 mm. This species has an evident sexual dimorphism. The body of males is completely black and slightly smaller than the female. The thorax is covered by black hairs, with gray hairs on the sides of breast and abdomen. Head, proboscis and palpi are blackish-brown, whereas legs and halteres are black. The eyes are enormous and contiguous, while in the females they are smaller and clearly separated. The short and robust antennae are inserted under the eyes. Wings are transparent or whitish, but brownish along the costa. In the females the dorsal surface of the thorax and the abdomen is orange-red, while prothorax and sides are black. Head, antennae and palpi are black. Legs are black. Wings are brownish-yellow, with dark brown costa. This species is rather similar to Bibio pomonae, but this last species has red-colored femurs.

This species is present in most of Europe (Austria, Belgium, British Islands, Czech Republic, Denmark, France, Germany, Greece, Italy, Latvia, Liechtenstein, Norway, Poland, Portugal, Slovakia, Spain, Sweden and Switzerland), in North Africa and in the Middle East.