Comprehensive Description

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General Description

Approximately 7 to 15 mm in length, black and yellow body, face yellow. Although S. torvus looks superficially very much like both S. ribesii and S. vitripennis (refer to descriptions for these two species), its distinctive characteristic is that both males and females have hairy eyes. The hairs on the male eyes are denser and longer than those on the female eyes, however this characteristic is quite clear for both sexes (under a microscope). As well, the yellow bands of tergites 3 and 4 are complete, and both sexes have a hind femur that is black for approximately the basal three-quarters (Vockeroth 1992).


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© University of Alberta Museums

Source: University of Alberta Museums

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