[Bikkuri]

Is the harlequin the same bug that clusters in corners of rooms and bite? From what I recall, they also stink.

Yes, that is correct ;^)

That's the Harlequin Beetle. Different critter, altogether: ~

Ironically enough, just 2 or 3 dats ago, I specifically looked this type up (having a problem with them here in Japan)..

Harmonia axyridis:
   Harlequin ladybird (Ladybug.... Brit's Ladybird is so annoying to me..)
      It is commonly known as the Harlequin ladybird (because it occurs in numerous colour forms).
       (I know that you specified the Harlequin Beetle, but, same Wiki talking about the Harlequin Ladybug: )

~

  Worldwide propagation
    Many people now view this species as a nuisance,[5] 
    partly due to their tendency to overwinter indoors and the unpleasant odor and stain left by their bodily fluid when frightened or squashed, 
    as well as their tendency to bite humans.[5]

I alwqays find it strange that when i am researching something, usually, a few days later, there is always a thread about what I was researching (o.O) lol ;^)

[Bikkuri]

Apologies, forgot to include the link :p
Harmonia axyridis / Asian Ladybug / Harlequin Ladybug

Also, apologies about misspell/typos :p

[Carriage Hill]

I used to buy cartons of them in, FedEx Overnight, from Texas, for the greenhouses and never had a smell or bite.

Then, I switched to praying mantids, which became like pets to me. We’d cultivate their breeding in our nursery stock growing fields, harvest the chrysalis (cocoons), and let ‘em hatch out in the GHs, every spring.

[1_Rain_Drop]

Thank you!
They do stink and bite!