Hi everyone, just wanted to share my experiences. While I have no data on breeding Mantichora, Anthia breeding is possible, but very very tricky.
That larva photo in the link that Matt posted is indeed an Anthia sexmaculata L1 with 100% certainty. The L1 is an active predator that prefers to hunt soft-bodied insects. Getting to this stage in the breeding is relatively easy if you know a little bit about the biology and habitat of the beetles (these are psammophile beetles found in the desert). Each female lays a single HUGE egg from which this larva hatches. On very rare occasions with good conditions and feeding, a female can lay 2 eggs. How to trigger them to lay eggs is another story (see last paragraph).
While Anthia adults can live for years, they have a very short life cycle or development. They hatch from the egg at an enormous size (think of it as if they lost the first larval stage, in which they were supposed to be tiny), so there are only two intars. The L2 larva of Anthia looks completely different from L1. It is pale, fat, with very short legs and essentially immobile, making it look more like a grub rather than a carabid larva. Feeding at this stage is extremely difficult and must be done by hand, as the larva barely moves. In the wild they feed on ant brood in the nest or in a chamber made by L1 that connects to the nest. The larva is also extremely sticky at this stage (not sure if it helps it in feeding), which can later cause problems in pupation.
As for Mantichora, it is a tiger beetle. I would assume that for good breeding you need moist, almost wet, clay-type soil with a good depth to allow the larvae to burrow vertically or diagonally. Most tiger beetles I know are extremely seasonal (much like carabids). So some experimenting with temps and humidity level is a must.
those larva are amazing critters