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I have been seeing them more and more frequently indoors. I am currently in the Midwest United States, weather has been unusually warm for December, and there are many trees nearby. Can someone please help identify this?

The pictures are of the same bug, but from different angles.

BUG!!!!!!!!!!BUG!!!!

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Brown marmorated stink bug (Halyomorpha halys):

bmsb-http://bugguide.net

See here, here, here or here for information.

These have become hugely invasive in the Northeast and Mid-Atlantic (and slowly Southeast) portions of the U.S. as well as along the West Coast.

The brown marmorated stink bug (Halyomorpha halys) is native to Eastern Asia, and likely 1st started spreading around the U.S. in Pennsylvania in the early 2000s.

bmsb map - wikipedia.com

Finally, you can see an image of the life stages of H. halys here.

Update:

Just for clarification, other brown stink bugs do exist and can be easily confused with H. halys. This article from UF IFAS, for example, demonstrates how to differentiate H. halys from Euschistus servus:

enter image description here

See here and here for additional ID tips and further reading.

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  • $\begingroup$ Though the brown marmorated stink bug is non-native and hugely invasive, the bug's 'ick' factor is not as bad as the native stink bugs that smell WAY worse! I guess the difference is, people rarely find native species indoors while these Asian ones infest homes in the winter, bringing them into closer contact with most people. $\endgroup$
    – theforestecologist ♦
    Commented Jan 21, 2016 at 14:53
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    $\begingroup$ Also if you see one of these insects, please consider reporting it! Though the battle is likely lost, there are still attempts to actively manage against the spread of these stink bugs. Google "report brown marmorated stink bug" and find a local organization or university that is collecting data in your area /region $\endgroup$
    – theforestecologist ♦
    Commented Jan 21, 2016 at 14:56
  • $\begingroup$ I've been seeing them for two decades in the Pacific Northwest! $\endgroup$
    – user3970
    Commented Aug 11, 2016 at 0:04
  • $\begingroup$ General info about some common stink bugs foudn in the midwestern US: Stink Bugs of Ohio Soybean $\endgroup$
    – theforestecologist ♦
    Commented Jul 12, 2019 at 18:03
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    $\begingroup$ @DavidTonhofer a quick search shows this insect was found in Europe as early as 2007 (Wermelinger et al., 2008). Zhu et al. (2012) created predictive models of their range expansion 8 years ago, which predicted spread throughout much of Europe (See Fig 6). Leskey & Nielsen, (2018) confirm that H. halys has established populations in many European countries as of 2018. (See map in Fig 1). $\endgroup$
    – theforestecologist ♦
    Commented Mar 17, 2020 at 16:40

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