Breeding Dorcus Titanus

Currently I have my mating pair housed together and I seem to have no luck getting them to mate. The male seems to be keen, but both if them only come out at night and I've yet to observe them actually mating. Neither of them seems to be feeding actively. Is there a way I can tell if they have mated? I have heard that they tend to eat more around the time that they start mating so I will continue to provide them with lots of food.

 
Are they hanging out together? Is the male staying close by when female is feeding? Then yes,  they have mated. How old are they since emerged? Once female has mated, yes, she will eat all nights long for couple days. What subspecies is that? depending on subspecies, you may have to separate them once mated. Males may kill the females sometimes.

 
currently the male is out all day and the female is largely out at night, though not every night. I introduced a little hard rotted wood for them just in case. The male is feeding a lot, and generally if the female appears the male is not aggressive towards her. I think they have been out for only a month. The subspecies is palawanicus. Would they have reached sexual maturity by this time?

 
The male is feeding a lot, and generally if the female appears the male is not aggressive towards her.
Good sign for now. Still unknown whether they ACTUALLY did it or not. Probably did...

Would they have reached sexual maturity by this time?
When did they emerge? Disregarding the subspecies, Dorcus titanus sspp. only need about just couple months (1-3 months) to be matured enough to mate and reproduce. Have you tried placing male on female to trigger the mating?

 
I have, but the male got tense and started to attack. I find that just keeping them together keeps the male calmer and makes him less likely to attack for now. I believe they actually emerged in early March, around the 10th

 
I have, but the male got tense and started to attack. I find that just keeping them together keeps the male calmer and makes him less likely to attack for now. I believe they actually emerged in early March, around the 10th
I would separate them for now, and wait for another month to put them together. Keeping males and females not yet matured won't become a friend, they will get stress from each other. I would suggest you to keep them separate for now.

 
I noticed the female digging aggressively into some rotted wood I provided in the tank. Quite a substantial amount of wood was just hollowed out. Could this be a sign that they have mated?

 
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