hermit flower beetle

(Osmoderma eremicola)

Conservation Status
hermit flower beetle
Photo by Norm & Peg Dibble
  IUCN Red List

not listed

     
  NatureServe

NNR - Unranked

     
  Minnesota

not listed

     
           
           
           
           
           
           
           
 
Description
 
 

Hermit flower beetle is a large, fairy common, scarab beetle that resembles a May beetle or June beetle. It occurs in the eastern United States from Maine and Minnesota south to South Carolina and Kansas and in adjacent Canadian provinces. It is found from May to August in rotten logs and tree holes in woodlands and orchards.

The adult is robust, flat, 13 16 to 1¼ (21 to 32 mm) long, dark brown, and shiny. There is a deep excavation on the head between the eyes.

The exoskeletal plate covering the thorax (pronotum) is covered with deep pits (punctures) and has a deep excavation at the front. The triangular plate between the wing bases (scutellum) usually does not have punctures in the middle and on the sides. The hardened wing covers (elytra) are smooth, not wrinkled. They have rows of fine punctures and scattered smaller punctures, the latter becoming more dense at the sides. The abdomen is densely covered with short brown hairs that poke out from under the elytra.

The larvae are white and large, up to 2 long.

 
     
 

Size

 
 

Total Length: 13 16 to 1¼ (21 to 32 mm)

 
     
 

Similar Species

 
  Rough hermit beetle (Osmoderma scabra) is smaller, no more than 1 long. As the common name suggests, the elytra are wrinkled, not smooth.  
     
 
Habitat
 
 

Woodlands

 
     
 
Biology
 
 

Season

 
 

July through early September

 
     
 

Behavior

 
 

Hermit flower beetle is active at night and will occasionally come to lights. It hides during the day in a bark crevice near the base of a hardwood tree. When disturbed it exudes a strong leathery odor.

 
     
 

Life Cycle

 
 

 

 
     
 

Larva Food

 
 

Decaying wood in the trunks and branches of old hardwood trees

 
     
 

Adult Food

 
 

Sap of hardwood trees

 
     
 
Distribution
 
 

Distribution Map

 

Sources

24, 27, 29, 30.

 
  7/27/2019      
         
 

Occurrence

 
 

Fairly common

 
         
 
Taxonomy
 
 

Order

Coleoptera (beetles)  
 

Suborder

Polyphaga (water, rove, scarab, longhorn, leaf and snout beetles)  
 

Infraorder

Scarabaeiformia  
 

Superfamily

Scarabaeoidea (scarab, stag and bess beetles)  
 

Family

Scarabaeidae (scarab beetles)  
 

Subfamily

Cetoniinae (fruit and flower chafers)  
 

Tribe

Osmodermatini (Osmodermini)  
 

Genus

Osmoderma  
       
 

The genus name Osmoderma means “smelly skin”. Adults exude a leathery odor when disturbed.

 
       
 

Synonyms

 
 

 

 
       
 

Common Names

 
 

 

 
       

 

 

 

 

 

 

 

Glossary

Elytra

The hardened or leathery forewings on an insect used to protect the fragile hindwings, which are used for flying, in beetles and true bugs.

 

Pronotum

The saddle-shaped, exoskeletal plate on the upper side of the first segment of the thorax of an insect.

 

Scutellum

The exoskeletal plate covering the rearward (posterior) part of the middle segment of the thorax in some insects. In Coleoptera, Hemiptera, and Homoptera, the dorsal, often triangular plate behind the pronotum and between the bases of the front wings. In Diptera, the exoskeletal plate between the abdomen and the thorax.

 

Tarsus

The last two to five subdivisions of an insect’s leg, attached to the tibia; the foot. Plural: tarsi.

 

 

 

 

 

 
 
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Norm & Peg Dibble

 
 

Huge beetle in my living room!!

I am grossed out!!! I sat down in our living room a while ago to brush my cat and saw this huge beetle crawling out from under our coffee table!! So I put her down quickly and took photos, first things first.

Then managed to put a Dixie paper cup over it and slowly slide an index card under the cup, like we often do with some bees/moths to carry them outside where they belong. I was worried that my cat would try to paw it but luckily she paid more attention to me getting the cup etc.

I just can't figure out how this got inside. We have a fireplace and under our living room is a crawl space, but we rarely have bug problems, and they are small if any. Could it really have flown in through the door with us?

I can't recall ever running into one in our 40 years of owning a home and gardening. It is black and bigger than a June bug. I took some photos from under the table and some on our sidewalk after letting it go. Our carpet has a pattern of 3" squares with circles in them. I'm sure glad it didn't try to fly! I'm very afraid of spiders, by the way.

  hermit flower beetle  
       
    hermit flower beetle  
           
 
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Other Videos
 
  Huge Beetle! Scarab (Osmoderma Eremicola)
DevHackMod Channel
 
   
 
About

Published on Jul 22, 2017

Found this bug while walking in Toronto, Canada, and it was one of the largest I've ever seen around here. Identified it as a scarab (osmoderma eremicola)!

 
  Osmoderma eremicola
jiborama
 
   
 
About

Published on Jul 12, 2008

There was a lack of videos about Osmoderma on youtube.

No, it's not the most pertinent thing EVER about this insect, but please, don't hate me for that. :)

Specimen caught July 9 in Ste-Julie, Québec, Canada

 
       

 

Camcorder

 
 
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J. Mcgie
7/25/2021

Location: Minneapolis, MN 55418

   
  Norm & Peg Dibble
7/25/2019

Location: Maple Grove, MN

I am grossed out!!! I sat down in our living room a while ago to brush my cat and saw this huge beetle crawling out from under our coffee table!! So I put her down quickly and took photos, first things first.

Then managed to put a Dixie paper cup over it and slowly slide an index card under the cup, like we often do with some bees/moths to carry them outside where they belong. I was worried that my cat would try to paw it but luckily she paid more attention to me getting the cup etc.

I just can't figure out how this got inside. We have a fireplace and under our living room is a crawl space, but we rarely have bug problems, and they are small if any. Could it really have flown in through the door with us?

I can't recall ever running into one in our 40 years of owning a home and gardening. It is black and bigger than a June bug. I took some photos from under the table and some on our sidewalk after letting it go. Our carpet has a pattern of 3" squares with circles in them. I'm sure glad it didn't try to fly! I'm very afraid of spiders, by the way.

hermit flower beetle  
           
 
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Created: 7/27/2019

Last Updated:

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