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Have a Crab Spider Problem?


The adult Dobsonfly is a large, winged insect that grows up to 5” long with long antennae and pinchers. They are nocturnal and attracted to bright lights found near waterways. The adults on live only seven days, usually long enough to mate, then the female lays her eggs near water.

The Dobsonfly lives most of its life in its larval stage living underwater, where it grows to about 3” long and feeds on other underwater insect larvae. They are often used as fish bait but have h3 pinchers and can bite humans.

After a few years the Dobsonfly larvae move onto land to pupate into adults. They remain in a cocoon for the winter, emerging in spring or summer as adults. The adult female’s pinchers are h3 and can leave a painful bite. The adult male’s pinchers are large but are rarely able to bite. Both will release a stinky anal spray to deter predators.




up to 5”


The Thomisidae are a family of spiders, including about 175 genera and over 2,100 species. The common name crab spider is often applied to species in this family, but is also applied loosely to many other species of spiders. Among the Thomisidae, "crab spider" refers most often to the familiar species of "flower crab spiders", though not all members of the family are limited to ambush hunting in flowers.

Control Advice

Crab Spiders prefer outdoors. If you find one inside, capture it in a cup and take it outside where it will prey on insects in your yard.

Active Seasons

Crab Spiders are most active in spring, summer and fall.

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