genus: Aeshna

Twenty species of Mosaic Darners are known to North America.  These rather medium to large size darners have a dark brown thorax with blue, green or yellow lateral stripes that may be straight or irregular in shape. These patterns may show unique designs in each species.  In the mature males the abdomen has blue or green spots on each segment. Wings may be clear, tinged brown or have dark patches at the bases depending upon the species.   A black T-spot is present on the forehead, some species may have a black line across the upper part of the face.

Females vary considerably, and in most species there are two or even three color forms, one like the male, and others more green or yellow.  Females in this genus oviposit singly, without the male attached.

The members of this subgroup can definitely be a challenge to ID in the field due to their varying color forms and patterns.  The lateral thoracic stripes are an important way of identifying them but in many instances, hand examination of the genitalia is necessary.

Mosaic Darners inhabit lakes, bogs, fens, swamps, slow streams and often can be seen flying over open fields.