Currently viewing the category: "Rain Beetles"
What's That Bug? does not endorse extermination

Subject: What kind of bug is this
Location: California Sierras
November 4, 2016 5:49 pm
I found this beetle yesterday November 3rd. I tried to identify it myself but no luck
Signature: Paul

Rain Beetle

Rain Beetle

Dear Paul,
This is a Rain Beetle in the genus
Pleocoma, a group that is endemic to western North America, mainly California and Oregon.  Your individual is a male.  Females are flightless and they live underground.  The winter rains stimulate metamorphosis and males fly in the rain to seek mates.  Are you able to provide us with more specific location information?  We will contact Gene St. Denis to see if he is able to identify the species.

Hi Daniel
Thank you for your help- I believe your right about it being a Rain Beetle. I went to your link and saw it referenced HWY 88 and Amador County. I am located about 35 miles south in the sierras in Calaveras County. Where by the way Mark Twain wrote the Calaveras Jumping Frog story (if you heard of that). I am in the town of Arnold elevation 4000 feet. The day I found it was right after a heavy rain which was what your link said
Thank you for your help!

Thanks for the additional location detail.  We hope Gene St. Denis can provide a species name for you.

What's That Bug? does not endorse extermination

Subject: Pleocoma hovorei La Rue 2007
Location: Paynes Creek, Tehama Co. California,USA
January 26, 2016 10:04 am
I went up to Paynes creek off of Highway 36 , west of Red Bluff on November 15, 2015 and set up my Home Made Black lights Vein Traps at 5:00 am and waited. It had and was raining @ 48 degree ambriant air temp with light winds. Soon several nice Black Pleocoma males started flying and several went into the traps and several went right by with me … with me chasing right after them in a hurry even with my net ! Soon 6:45 am sounded shut down time and I packed it up . These Shiny Black ” Little Fuzzy Butts ” were named after my Mentor from the 1960’s and 1970’s , the Late ” Frank Hovore ” a Giant of the Entomology World and One Great Man . He is missed by all. Gene St. Denis -Sierra Nevada Research- South lake Tahoe , California , USA
Signature: Gene St. Denis

Rain Beetle: Pleocoma hovorei

Rain Beetle: Pleocoma hovorei

Good Morning Gene,
We are so lucky that you continue to provide us with a diverse sampling of the unique California Rain Beetles.  We see your images are also featured on BugGuide.  We also located this marvelous YouTube video of mating
Pleocoma hovorei.

Rain Beetle: Pleocoma hovorei

Rain Beetle: Pleocoma hovorei

What's That Bug? does not endorse extermination

Subject: Los Angeles County Rain Beeltes
Location: Sanberg area, Los Angeles County, CA USA
January 23, 2016 6:43 pm
Here are some pictures of the Beautiful Pleocoma badia hirsuta males that Joe and I collected near Sanberg, Los Angeles County, CA with Black lite vein traps from 5:00 am to 6:45am on Jan. 14 and 15 , 2016 . Scattered rain 52 degrees with soaking wet ground . We tried to find some female Pleocoma …..but, as usual they were Hiding very well from us. One of these days … Gene St. Denis -Sierra Nevada Research – South Lake Tahoe
Signature: Gene St. Denis

Rain Beetle

Rain Beetle

Hi Again Gene,
Thanks for providing us with your latest Rain Beetle images as well as providing the conditions surrounding the collection. 

Rain Beetle

Rain Beetle

What's That Bug? does not endorse extermination

Subject: Pleocoma linsleyi
Location: Sanberg, L.A. Co.,California,USA
January 21, 2016 8:10 am
January 14 and 15th 2016 I drove down to L.A. county area around Mt Pinos and Sanberg with Joe during the last storms in search of the Rain Beetles called Pleocoma linsleyi – males. We were successful! We also found a couple Pleocoma badia males as well. Home made Blacklites were the ticket from 5:00 to 6:45 am . Cheers, Gene St. Denis – Sierra Nevada Research – South Lake Tahoe, California USA
Signature: Gene St. Denis

Rain Beetle

Rain Beetle

Dear Gene,
You are amassing quite a collection of different species of Rain Beetles.  Thanks for providing us with documentation of what the 2016 rains are producing.  In the future, you may send larger digital files as the quality of the smaller files is considerably less detailed when posted online.

What's That Bug? does not endorse extermination

Subject: Pleocoma fimbriata – male
Location: Pioneer and Hwy 88 , Amador County, California, USA
November 5, 2015 11:08 am
I believe these Pleocoma to be a ” Plecoma fimbiata-Linsley 1938 “- males due to locality association . During heavy rain in predawn to just after sunrise, located this fellow under street lite . Also, then collected nice series under the lights at all the markets, gas stations , local stores, and streetlights . All around the quaint small community’s along High 88, of Pine Grove and Pioneer. Many were found later during the day dead or just barley moving on the ground . Many ,many very flat road kills…sniff, sniff. Got some on my home made plexiglass black lite vein traps as well . 22 mm for the smallest runt to 35 mm for the largest furry with calipers. Soil was wet down past 12 inchs. No females or burrows located. Racoon s, dogs, coyotes, and domestic cats were observed to consumed several . Gene St. Denis _ Sierra Nevada Research , South Lake Tahoe , California USA
Signature: Gene St. Denis

Rain Beetle

Rain Beetle

Hi again Gene,
We can see that when added to your sighting from last year, your number of Rain Beetle species sightings is increasing with the frequent and early rains we are having in California this year after so many years of drought.  Are you by any chance donating any of your specimens to local Natural History museums?

Rain Beetle

Rain Beetle

Rain Beetle

Rain Beetle

What's That Bug? does not endorse extermination

Subject: Pleocoma blaisdelli -males
Location: Don Pedro Reservoir , Tuolomne County, California, US
November 5, 2015 10:53 am
I headed down to 49 and Don Pedro Reservoir 11/3/2015 ( during our first heavy soaker rains ) and set out a couple of my home made Plexiglas vein Black lite bucket traps just off a dirt road and waited . 56 degrees Rain. Finally the lord sent down more rain and at 5:00 am to 6:10 am a very nice series of males newly hatched , very sharp horned , and scratch free ! Very Shiny black elytra covers and golden brown Fur ! I believe these ” Rain Beetles ” to be males of ” Pleocoma blaisdelli Linsley 1938 ” , due to locality association , number of antennae segments, and Physical Description . The males lengths were exactly ( on metal calipers ) 20 mm to 28 mm long. 7 lamillie segments . I did not find or locate any females or their burrows .
… Gene St. Denis , Sierra Nevada Research , South Lake Tahoe , California
Signature: Gene St. Denis

Rain Beetles

Rain Beetles

Dear Gene,
We are positively thrilled to post your images of this Rain Beetle emergence.  From your information, it sounds like you went out on a Rain Beetle safari, and that you were quite successful.  The life history of Rain Beetles in the genus Pleocoma is quite fascinating, and we often marvel at the intricate complexity of the lives of certain insects, and we can’t help but to wonder how the immobility of the female Rain Beetle, who lives deep underground, enables the species to survive, but that also leads to the diversity in the genus and the location specificity of the different species.

Rain Beetles

Rain Beetles

What's That Bug? does not endorse extermination