The yellow spear-winged fly or Lonchoptera lutea, is the type species of the genus Lonchoptera

Lonchoptera

Lonchoptera, a genus of spear-winged flies , are tiny to small , slender, yellow to brownish-black bristly Diptera. Their common name refers to their subacute wings, which have a distinct and sexually dimorphic venation...

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Adults vary a great deal in colour, from yellow to dark brown. The anteroventral bristle

Bristle

A bristle is a stiff hair or feather. Also used are synthetic materials such as nylon in items such as brooms and sweepers. Bristles are often used to make brushes for cleaning uses, as they are strongly abrasive; common examples include the toothbrush and toilet brush...

 of the middle tibia is missing from the distal half. Scutellum brown to yellow. first and second antennal segments yellow, the third being dark, with a subapical arista

Arista (biology)

In insect anatomy the arista is a simple or variously modified apical or subapical bristle, arising from the third antennal segment. It is the evolutionary remains of antennal segments, and may sometimes show signs of segmentation...

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Unlike most Lonchoptera, Lonchoptera lutea shows a marked preference for unshaded habitats. It is widespread and often very common throughout most of Europe, extending into parts of Asia.