Comprehensive Description

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General Description

Approximately 7 to 15 mm in length, black and yellow abdomen with a yellow face. Lateral margins of abdominal tergites narrowly, subtly but continuously yellow (see A on image; this can be very faint, especially on older specimens). Males: The upper half of frons dark gray and covered with a waxy, whitish powder (i.e. pruinose), with lower half of frons dark to light yellow. Hind femur is either entirely yellow, or the basal half is black and the rest is yellow. The wing membrane is entirely covered with tiny hairs (i.e. trichose). One or both of tergites 3 and 4 with either widely or narrowly separated yellow spots (see B on image). Females: Similar to male, but all femora entirely yellow, face yellow, frons similar to male but only lower one-third of frons bright yellow (Vockeroth 1992).

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© University of Alberta Museums

Source: University of Alberta Museums

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