Great Grig

Jerusalem Cricket/Potato Bug
Location:  Spokane, WA
October 2, 2010 2:48 am
Hello! Thanks to your website, I was able to identify a bug I’ve seen several times in my life, and seriously creeped out by.
I clean an elementary school in a rural area, and always find them in the tiled bathrooms far from any outside doors. I wonder what it is they are looking for…water? Somewhere cool?
These are very hearty creatures I have also discovered. One time, visiting in the Sierra Mountains, I got up in the morning to put on my shoes. A bit later I realized I had a rather uncomfortable rock in my shoe, but was unable to stop what I was doing to remove. Roughly half hour later, I pulled off my shoe and slapped the heel into the palm of my hand catching a really angry Jerusalem Cricket. I then promptly flipped out completely, flinging the insect in the air and released a piercing scream. I was completely taken by surprise something that size survived under my foot. Since that day, I have to say, it’s been on my mind what that insect was.
Thanks again for the great site with the awesome information!
Signature:  Corey Douglas

Great Grig

Hi Corey,
Jerusalem Crickets and your insect, a Great Grig,
Cyphoderris monstrosa, are all in the same suborder Ensifera, the Longhorned Orthopterans, but they are in different families.  The Great Grig has a much more limited range, as it is only found in the Pacific Northwest.  According to BugGuide, Great Grigs are found in:  “coniferous forests containing Lodgepole Pine, Englemann Spruce, and Mountain Hemlock; adults hide beneath leaf litter during the day, and become active at night, climbing tree trunks and continuing high into the branches to feed, sing (males), and mate.”

2 thoughts on “Great Grig”

  1. Haha, my room is in a 100 year old basement. I just recently found one of these guys for the first time. Good to see I’m not the only one freaked out by the size of these buggers.


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