Check first that the taxa are not in the list of additional names ( Sericoderus brevicornis isn't there) . If they are then there is no advantage in creating one in the Coleoptera list.  The Taxon you enter is similar to any other, but it doesn't get a taxon group or sort order (see note below) and  it can't be exported. You can add the taxa into the list (in the right place or at the end), or into the special list designated for user added taxa. If they are all togteher in the 'A List to Hold User Added Taxa'  they are easier to find, but  it doesn't matter as long as you remember where they are. When the taxon goes into the dictionary you need to move the determination. You can do this manually or there are some tools which help with this. Tools include batch updates and there is an addin which is being trialed, which allows a sort order and group to be added to the taxa and also manages changing the entries when the taxon is added to the dictionary.

The addin has been checked by a few people and some minor bugs fixed. It will allow you to add new taxa and also to allocate a taxon group and sort order to them. It has not had enough use for me to be sure it is Ok, but if used to add taxa any problems should be obvious. You may like to give it a try.

It should  appear in the Dictionaries menu. Should have said.

Not good news that it crashed. What happened. All yoiu should need to do is to enter a name, select the rank (eg species). Click on Add and it will ten ask you to choose a parent.  If in testing you choose a high level it will take a while to change the sort orders (it needs to move everthing below the one you have inerted), but this will nolt be the case if the parent is a genus)