Just got back from wikipedia. I was trying to answer a question one friend asked: what is the stage of development after chrysalis. Of course it's butterfly, but is there a standard biological term, we wondered?
The answer is imago. Imago is synonymous with the adult (sexually mature, winged) stage of development not just in butterflies, but in all Holometabola (
Endopterygota), insects that undergo Holometabolism (metamorphosis).
These include: beetles, flies, lacewings, fleas, caddisflies, mosquitos, ants, bees, and of course butterflies. There are more, but you can just go to the
link for a complete list.
So it's embryo (egg), larvae (caterpillar), pupa (chrysalis), and imago (adult).
Incidentally, the plural of imago is imagines.Also, the pupa stage of a mosquito is called a 'tumbler', FYI.