Species name: Fannia canicularis (L.).
Family: Muscidae
Some species of the genus Fannia are commonly found breeding in animal manure and confined livestock facilities. The most common is the little house fly, Fannia canicularis (L.).
The little house fly is about 5–6 mm long; smaller than the house fly. The adult is blackish-gray with three indistinct black dorsal longitudinal stripes. The sides of the thorax are a lighter color; the legs are black; the halteres yellow. The head is gray with black frontal stripes and gray sides.
Like the house fly, the male eyes are nearly together (holoptic), while the female eyes are further apart (dichoptic). The antennae are like those of the house fly, but the arista on each is slender and covered with a fine pubescense. The wing has the second anal vein strongly curved towards the first anal vein (Figure 16B).
The fourth longitudinal vein (M1+2) is straight (not bent as in the house fly). The abdomen in the basal portion is yellowish.
The adults of the closely-related species Fannia scalaris (Fabr.) resemble the little house fly, but can be distinguished by the presence of a definite crest on the apical part of the mid-leg tibia. Fannia canicularis has no such crest.
Fannia scalaris is known as the latrine fly because of its occurrence in human privies. It is less commonly found in animal manure.
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