Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Home » Guide » Arthropods (Arthropoda) » Insects (Insecta) » Beetles (Coleoptera) » Ground and Water Beetles (Adephaga) » Predaceous Diving Beetles (Dytiscidae) » Dysticinae (Dytiscinae) » Acilius » Acilius mediatus
Photo#265536
Dytiscid - Acilius mediatus
Copyright © 2009 tom murray

Dytiscid - Acilius mediatus
Groton, Middlesex County, Massachusetts, USA
April 12, 2009
Size: 12.4mm
This might be Acilius mediatus, but it just looks a little different to me.

Images of this individual: tag all
Dytiscid - Acilius mediatus Dytiscid - Acilius mediatus Dytiscid - Acilius mediatus Dytiscid - Acilius mediatus
Contributed by tom murray on 12 April, 2009 - 7:24pm

Moved
Moved from Predacious Diving Beetles.
… Tim Loh, 12 April, 2009 - 7:52pm

Yes, female A. mediatus
Another species that might be similar would be A. fraternus- in both species, females are non-sulcate (with no elytral ridges) and the hind legs are dark in colour (dark red to black). However A. fraternus is larger (min. size= 13 mm) and may not/rarely occur in your area (northern limits- NY)
… Tim Loh, 12 April, 2009 - 7:52pm

Disclaimer: Dedicated naturalists volunteer their time and resources here to provide this service. We strive to provide accurate information, but we are mostly just amateurs attempting to make sense of a diverse natural world. If you need expert professional advice, contact your local extension office.

Contributors own the copyright to and are solely responsible for contributed content.
Click the contributor's name for licensing and usage information.
Everything else copyright © 2003-2009 Iowa State University, unless otherwise noted.

Bugguide is hosted by Iowa State University Entomology.