I can still remember my delight as a child when I found a catasarcus weevil, put it on a finger, and felt it hanging on for dear life as I tried to remove it. Weevils are harmless, galumph along and look cute. This link provides an excellent introduction.

a very general rule of thumb is the longer the snout the deeper the eggs are laid.
The Haplonyx species (pear-shaped weevil) was about to drill into a Drummonds mallee bud.
The file below describes the life cycle of another Haplonyx species

Tuart bud weevil and gregarious gall weevil |
Large weevils are similar. Catasarcus weevil larvae chew eucalypt roots, and Leptopius species (wattle pigs) chew acacia roots. Both pupate underground. This Foxypress recounts fossilised Leptopius pupal cases (clogs) that I found at Mukinbudin.