Yes yes... all of that BUT...

The detirmining factor would be the sclerotisation of the spermathecae. If this has not taken place and can be clearly visible in the exovium, it's no use mating a sub adult female. In my opinion (and very limited experience) they will mate, but I think the chances of the sperm surviving until the female decides to make an egg case will be very slim.

I have read that especially with H. Lividums that a smaller female has a better chance of dropping an eggsac than a larger female.

thanx scarab....i have mature female en sub adult........and i think ill mate them both just for the experience with te sub adult femal.

Its worth a try, no harm can come to the T except if the male gets a bit rough but otherwise why not.
Have meet many breeders that breed smaller females with success.
Good luck with the breeding, what species are you breeding by the way?

Ruff, i am going to breed chillian rose normal colour........i hgave a nother question......is the normal and the red form just colour forms of the same specie so they can interbreed or are they difrent sub specie or specie?

Whats that sound? Oh, just crickets... LOL! Tough question, but a question I would love to know the answer for. +1 Carlo.