Hi.
There were no successfull inter-species-crossings:
The only case of which I konw of a hybrid Ps. ocellata x wahlbergii did not reach adulthood.
Hierodula were not crossbred, just because someone thought they were. Most crossbreedings were not crossbreedings but just misdeterminations.
Hybrids are rare and, if existing at all, infertile.
I do not see any sense in this, except when done for taxonomic purposes.
Regards,
Christian