Two Longhorned Borer Beetles: Flatfaced Longhorn from Oklahoma and Long Jawed Longhorn from Arizona

bugman

March 2nd, 2009 at 11:44 am

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unknown longhorns not on wtb!
Mon, Mar 2, 2009 at 7:15 AM
Hi,
I have two unidentified longhorn beetles that I haven’t seen on What’s That Bug before. I looked through all the beetle pages and didn’t see either of them there. The first one is a little grayish-brown longhorn that is about 1 cm long. It was found in central Oklahoma. I have found several of these this year, ranging from brown to grey, and all of them have been found under loose boards. The second is about an inch long and is orange and black. This one was found in the Arizona desert five or six years ago. I appreciate any help you can provide.
Josh Kouri

Flat Faced Longhorn

Hi Josh,
We have been scouring BugGuide to try to provide you with speculations on your identifications, and then we will consult with experts to see if our identifications are correct. We believe your Oklahoma specimen may be Flat Faced Longhorn with no common name, Ecyrus dasycerus. Images on BugGuide look quite close. BugGuide has this information: “Size 4 to 10 mm. Identification ‘Variable in size, and darker and lighter variants occur, but the combination of body shape and the dark, inverted arc-like marking at the elytral base is distinctive (though the mark is sometimes faint).’(1) Season ‘Flight: April-August in Eastern North America.’(1) Food variety of hardwoods, esp. oak. Remarks ‘Attracted to UV lights.’ ” The photo on your finger indicates the small size of the specimen which matches the description on BugGuide

Flat Faced Longhorn

We haven’t had any luck identifying your Arizona specimen, and we are now running late for the day. Hopefully Eric Eaton can provide an ID or some assistance.

Long Jawed Longhorn

Update: From Eric Eaton
Mon, 2 Mar 2009 09:32:27 -0800 (PST)
Happy birthday, Daniel!
The Arizona longhorned beetle is a specimen of Trachyderes mandibularis. One of the larger and more colorful species down here….The specimen in the image is a female. Males have much longer antennae, and sometimes exaggerrated jaws.
Those little flat-faced longhorns are really tough to ID, so I’m not even going to venture a guess on genus and species….
Eric

Thanks for the greeting Eric, and thanks for the identification of the Long Jawed Longhorn.