IUCN threat status:

Not evaluated

Comprehensive Description

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General Description

Approximately 7 to 16 mm in length, black and yellow body. Eye bare, face yellow. Distinguishing between S. ribesii and S. vitripennis is quite difficult, however S. ribesii has the bm cell entirely covered with tiny hairs (i.e. trichose, see A on image) (Gilbert 1986). All specimens have tergites 3 and 4 with a yellow band rather than spots; these bands are usually complete but slightly divided in the middle in some specimens (see B on image), with this species generally showing a lot of variation in the shape of abdominal bands (Vockeroth 1992). Males: Frons usually completely dark, although it may be yellow on bottom one-fifth on some specimens. Hind femur either yellow or black on basal two-thirds. Females: Similar to males, although mid and hind femora only black right at base, with most specimens having a hind femur that is completely yellow (Vockeroth 1992).

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Source: University of Alberta Museums

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