The undead spicebush swallowtail moth was named Purple by Michael, following a similar thought process to when he named Blue.
With these two included, Michael now had seven named undead and a total of 25 undead under his control.
This also meant that his next daily Evolution Points would amount to 26 points—provided he didn't continue reviving more corpses and turning them into Evolution Point generators.
Of course, this wasn't possible.
With the insect-related matters out of the way, Michael moved to the place where he had stored the monster corpses he'd bought from the Association and began using {Undead Revival} on them.
As for why he didn't evolve his insect undead immediately, it wasn't because he didn't want to—it was because he preferred to do so only after successfully testing {Undead Summoning} on them.