The grub is probably from a Japanese beetle or other scarab type beetle. The 'C' shape is distinctive. The pupa is also probably from a beetle, since moths don't burrow. Insects go through a similar metamorphosis.
Thank you for your comment, dannarchy. Very likely a scarab type beetle indeed! I do think this is a moth pupa however, as beetle pupa looks so different and this so similar(https://biology.stackexchange.com/questions/48238/). Perhaps I assumed it was buried because I was digging around when I found that, while in fact, it could have been just from the surface. I've added your comment on the page.
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