Comments for
Large Black Bug Gentle Giant (Predaceous Diving beetle)

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Not always...
by: Anonymous

My understanding is these are not always so gentle and can inflict a fairly painful bite! Good thing these guy seemed to go with the flow :o)
Predaceous Diving beetle
by: Moni

Betty
As reported below in the comments these beetles feed and live mostly in the water.
They may have only come to your trees because of lights nearby....they will be returning to the water.

Are you sure this is the same beetle you saw??

You could send in a photo of your beetles so we can be sure.
Similar Beetle FOund
by: Betty

There are dozens on only one of our trees.They seem to be mating.
Never seen them before.
Would like more information on them.Will they damage the tree?
Predaceous Diving beetle
by: Moni

Pam
Looks like you have a predacious diving beetle, genus Dytiscus.
The adults will fly to lights at night so perhaps that is probably why you found it in the grass. The larvae are sometimes called water tigers. Both the larvae and adults are predaceous and feed on fish, mosquito larvae, other aquatic invertebrates, and sometimes tadpoles and salamanders.
Here is a site for more pics and information.
http://bugguide.net/node/view/14511

Here is another one found in Ontario on the Insect ID.
http://www.simplegiftsfarm.com/large-beetle-found-in-southern-ontario.html#ixzz0KcSIIqQE&D

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