THE XERCES SOCIETY FOR INVERTEBRATE CONSERVATION

Aquatic Invertebrates in Pacific Northwest Freshwater Wetlands
An Identification Guide and Educational Resource

Belostomatidae
(giant water bugs)

large bugs (20-65 mm) with broad, oval, slightly flattened bodies and raptorial front legs; wingtips have numerous veins; a pair of short strap-like appendages may be seen at tip of abdomen

Pleidae
(pygmy backswimmers)

front legs are not raptorial, and are similar to the other legs; tiny (< 3 mm); body is oval and convex