I think maybe it's a quatrain, specifically an envelope rhyme. As to the meter of the lines themselves, the first two appear to be adonic (dactyl+trochee, with the unaccented trochee syllables cesurally omitted), whereas the final two lines in effect mirror the adonic meter, employing iambic feet instead. What a lovely example of double mirroring -- using both the rhyme scheme and the internal meter.

Good to have you back in the fold, Rubrick!!