Here's some Reticulitermes from my main colony, kept in a rather large plastic container filled with sandy soil and "bundled" 3mm thick sprucewood planks.
Note the many brownish, larger individuals: these are adultoid reproductives. It's a peculiar caste very reminiscent of the primary royals (in fact, they just look like scantily sclerified primaries) that arise from the same stage, the last nymphal instar. Their greatest peculiarity for non-primaries is that upon maturing they actually unfolds well developed membranaceous wings very similar to the formers', though a bit smaller and "curlier" and as such unsuitable for flight. This caste will never leave the parent colony anyway, dealating inside it to mate and breed among themselves.
I have a ton of these in my main colony, which is convenient because if i want to create a new colony by gemmation i can simply throw some of them along with the workers and have instant egg production without needing to wait for the development of neotenics.
