Maximum Temps for Flower Beetles

[doc25]

Does anyone know the maximum temp that Flower Beetle grubs can endure? I keep them in an upstairs bedroom so the temp is always high but I recently had to install a steam humidifier due to some free-ranged arachnids. Now the temp is is the mid to upper 90's, depending on the outside tempature. So far they seem fine. Is this safe? Thanks for looking.

 

[Dynastes]

I thought the upper 80s was high. If they're fine in the upper 90s after a few days, much longer probably won't matter. The only problem with keeping grubs at rather high temps is they can develop faster without adding bulk and become small adults.