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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Polyphaga » Scarabaeoidea » Earth-Boring Scarab Beetles (Geotrupidae) » Bolboceratinae » Bolbocerosoma » Bolbocerosoma tumefactum
Photo#56495
Bolbocerosoma tumefactum - male
Copyright © 2006 Frank Guarnieri

Bolbocerosoma tumefactum - Male
7 km east of Paw Paw, Morgan County, West Virginia, USA
May 22, 1989
Size: 12 mm
Hovering low in dry grassy small forest clearing.

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Bolbocerosoma tumefactum - male Bolbocerosoma tumefactum - male
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Contributed by Frank Guarnieri on 8 June, 2006 - 6:22pm
Last updated 15 January, 2013 - 6:32pm

Bolbocerosoma tumefactum
Tentative ID made by going through the collection at University of Maryland several years ago. You cannot see the detail well here but there is very small horn on the head and an incredible amount of sculpturing on the anterior pronotum.
… Frank Guarnieri, 8 June, 2006 - 6:27pm login or register to post comments

 
Outstanding
No doubt about genus - will pull key for sp., probably right. The nice thing about this group is that spp. can be determined reliably by pattern of black markings (the black spot on the pronotum is key here). This is a male, females have pronotum unarmed.
… Phillip Harpootlian, 8 June, 2006 - 6:32pm login or register to post comments

 
yep
the black spot (sometimes merging with basal black area) on the pronotum and the elytra with lateral black markings NOT converging with sutural black stripe. From New York to Georgia, west to Ohio and Tennessee.
… Phillip Harpootlian, 9 June, 2006 - 12:18pm login or register to post comments

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