Lestes rectangularis is a species of damselfly

Damselfly

Damselflies are insects in the order Odonata. Damselflies are similar to dragonflies, but the adults can be distinguished by the fact that the wings of most damselflies are held along, and parallel to, the body when at rest...

 commonly called the slender spreadwing.

Adults are about 50 millimetres (2 in) long, with a wingspan of 30 millimetres (1.2 in). Its wings are translucent in contrast to a long, slender abdomen. The eyes are blue and there is a blue shoulder stripe. L. rectangularis can be distinguished from other spreadwings

Lestidae

Lestidae is a rather small family of cosmopolitan, large-sized, slender damselflies. They are of the order of the dragonflies and are commonly known as "Spreadwings." There are two subfamilies in Lestdae. The first subfamily is Lestinae. Damselflies in Lestinae rest with their wings partly open...

 by the lack of a blue tip on its abdomen

Abdomen

In vertebrates such as mammals the abdomen constitutes the part of the body between the thorax and pelvis. The region enclosed by the abdomen is termed the abdominal cavity...

. It lives near ponds, marshes, and bogs, where it flies during the summer months.