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pancakesfordinner

Found beetle larvae - rhino beetle?

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Hope the pic is good enough. 

My boyfriend was digging up stones from an old flowerbed and uncovered these two larvae. He is not a fan of insects but put them in a safe spot for me :)

Only beetle species I've seen in my yard up has been Hemiphileurus illatus. Is that what these are? Any guess how old they are? I'd like to try to raise them but my first and only try at raising a larva didn't go well. If I decide to put them back what's the best spot to put them back in, since their original home isn't there anymore? 

Thanks!

Beetle Larvae.jpg

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I can't ID them for you, but they certainly look plump and well fed! If you have soil from the flowerbed that they were living in, you could put that in a container and see if they pupate. If you put them back, put them back in the same flowerbed if it's available. If you were digging up the entire flowerbed, I'd say put them in whatever is nearby that has a similar soil type. If they don't like it they'll go elsewhere. :)

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It doesn’t seem that there are many reference photos online of Hemiphileurus larvae, but those look like flower beetle larvae (cetoniidae) larvae to me. If the grubs “walk” on their backs, they’re definitely flower beetle grubs, but if they try to use their legs to move right side up then they’re something else.

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That reminded me I saw what I thought was a June bug in the area, but it could have been a type of flower beetle so those are all possibilities. I'm a little worried about keeping the right conditions without knowing the species but I'm going to give it a shot and hope I get to find out. Thanks for the references :)

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Just because you saw Hemiphileurus illatus, that does not mean these larvae also are H. illatus. It could be many other scarab species including Dynastine, Melolonthine, Cetoniine, etc.. That is the most general morphology of scarab larvae. Their size does not seem to be large enough for any larger scarabs like Dynastes spp. or Strategus spp. It can possibly be any of smaller scarabs like Hemiphileurus sp., however, there are many different species of scarabs available here and there.

Are you located in Arizona?

Just put them back to where they are found, or acquire soil from where your boyfriend found these larvae, and keep them in a small container with ventilation holes punched. Water it when needed, and see what comes out of it. Their appearance does look like they are pretty much well developed, and is in the late L3 stage.

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