Description: A distinctive species that is sexually dimorphic. Males have fairly dark wings, with two main dark patches. Females only have one main dark patch on the wing, near the tips, and can sometimes lack dark patches all together, just having several dark spots. There is however a key characteristic shared among both sexes: the lack of a bold, contrasting white midline. Unlike other members of this genus, there is no bold white line down the vertex, thorax, and inner margin of the wings. There are several thin pale lines on the thorax, the middle of which extends onto the vertex; however, the two black marks on the tip of the head are bordered by the tan color of the head on both sides, rather than encapsulating a bold white line. This field mark can be clearly seen here. This species ranges in size from 4.5-6.0 mm (Beamer).
For images of pinned male and female specimens, see: UDEL. |