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rove beetle - Platydracus immaculatus

rove beetle - Platydracus immaculatus
Hammond, Ontario, Canada
September 13, 2008
Size: about 1.5 cm
This rove beetle was on our front walkway in the early morning sun. The closest match I could find in an internet search is Platydracus stercorarius, which looks similar to this one. I was hoping maybe someone may be able to help ID it. Thanks!

Images of this individual: tag all
rove beetle - Platydracus immaculatus rove beetle - Platydracus immaculatus

Found one of these guys today
Found one of these guys today in North Eastern NY. Just in from outdoors felt something in my shirt.. took it off and got this surprise crawling up my side. Will upload the picture soon.

Moved from Platydracus.

Wow, excellant find!
This is Platydracus immaculatus, a less common species of the genus. Seems that the more recent Ontario specimens (along with a couple other rarer large staphs) are all coming from the Ottawa region... (I have super old specimens from London, Ontario). I wonder if your area is one of the last decent patches of habitat in Ontario that they prefer? Anyways, this is something special and I wish I could find one in southern Ontario.

Additional note:
To distinguish this from macu*losus, a very common and similar species in eastern NA, note that immaculatus has:
uniformly pale legs, no velvet patches along the dorsal abdomen, a reddish head with dark markings, distinct gold patches along the dorsal abdomen and it is also smaller than maculosus.

Thanks for your photo Sharon,


P. immaculatus
This was a lucky find for me. At first glance from a few yards away I thought this was a piece of mulch on the walkway, but the insect lover in me had to walk over and check it out. When I couldn't find an image match online, I figured this would be either a variation of a common species or, as you said, something special. How exciting that it was the latter! Thank you so much for the ID, Adam. :)

Your photo
Hi Sharon,

I couldn't find your email in your profile so I hope you see this. I was wondering if you would allow your photograph to be used in a presentation a colleague of mine is giving to the Ministry of Natural Resources. I was asked to provide some slides on rove beetles that might be of interest to conservation and I think a live picture would really help.


Adam Brunke

am sorry for the late reply. I wouldn't mind at all if you used my photos. Thank you very much. :)

you're right about Platydracus, can't confirm the species

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