Comprehensive Description

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Differential diagnosis

Allograpta alamacula is very distinct due to the dark apical wing maculae, which is atypical for Allograpta. Also it differs from all other Australian Allograpta species in having the metasternum bare. The New Zealand species, A. ventralis (Miller, 1921) also has a bare metasternum and a faint apical wing macula. However, A. ventralis is quite different, having dichoptic males and narrow petiolate abdomen (Carver and Thompson 2003).

Small flies, 6 mm or less, with face straight, not produced anteriorly, with a large tubercle; oral opening about 2 times as long as wide, with oral apex at level of antennal base; antennal pits confluent; male holoptic; plumula absent; subscutellar pile fringe absent; wing broadly bare basomedially, with apical dark macula; alula broad, as broad as cell BM; metasternum bare; abdomen elongate (Mengual et al. 2009).


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© Mengual, Ximo

Source: Flower flies (Syrphidae)

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