Subject: What’s this Stripey Beetle
Location: Carmel Valley, CA
June 25, 2013 10:50 pm
Hello – this cute fella was hanging on my screen at 10:30pm and seems to have had a lucky escape as there was spider web on one foot. About an inch long, white and green striped beetle with brown ”really cute” face. Very mellow and gentlemenly.
Thanks much!!
Signature: Kimberly

Ten Lined June Beetle

Ten Lined June Beetle

Dear Kimberly,
This impressive beetle is a Ten Lined June Beetle,
Polyphylla decemlineata, a large Scarab Beetle that is found throughout much of western North America.  According to BugGuide:  “Adults feed on tree foliage; larvae feed on roots of shrubs/trees.”  Adults which fly during midsummer are attracted to lights and they make a squeaking sound known as stridulation when they are handled.  Even though the common name indicates they are found in June and your specimen was found in June, and even though the subfamily they belong to, Melolonthinae, is commonly referred to as May Beetles, we have selected your submission as the Bug of the Month for July 2013 since they are most commonly sighted in July.

Thank you so much as I really enjoyed him and now learning about him. Honored to be the Bug of the Month!!  You have a very cool site.

Comment:  July 24, 2013 12:13 pm
I’m so happy to have found your website!  Thank you for making the Polyphylla decemlineata your July Bug of the Month.  We have one of these delightful fellows in our backyard and his behavior is quite baffeling.  We find him on his back every day or so, and think he must be dead.  Then later in the day or the next we seem him walking about.  Do they sleep on their backs?  We jostled him a bit one day, thinking he was dead, and his legs wiggled.  We turned him over and he walked away.?…
Signature: Natalie

Hi Natalie,
We aren’t certain why you keep finding Ten Lined June Beetles on their back, but sometimes beetles fall that way and it takes them some time to right themselves.



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Location: Carmen Valley, California

3 Responses to Bug of the Month July 2013: Ten Lined June Beetle

  1. Jack Sonke says:

    The person who wrote in said they lived in Carmel Valley, CA. Its location is actually near the Central Coast east of Carmel, CA which is much more an agricultural area nearer to Salinas Valley.

  2. twiz says:

    We have found 4 of these at my work in the last week. Corvallis Oregon. They do make strange noises when I try to relocate from the car lot

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