Done.

Most instars are stages within nymphal (for hemimetabolous) or larval (for holometabolous) insects, which seems a bit too granular to me for this general field, so if you're interested in tracking instars, I'd suggest making a separate field, like "instar." Also, when searching for "larva" using this field, I'd expect to see all insects in a particular instar, but if we added instars here, they wouldn't show up in that result. Open to argument if others would like that here, though.

Oviposition is a behavior by sexually mature adults, not a developmental stage, so no, that wouldn't fit here. Maybe use http://www.inaturalist.org/observation_fields/707, which has an "egg laying" type, or a more free form field like http://www.inaturalist.org/observation_fields/2, or make your own field.

Agreed. I think another curator may have added it, but I'm going to remove it as an option here since I agree it makes more sense in another field.

I'm trying to keep this generally applicable to all insects, so if you want to track order-specific life stages like "subimago," I'd recommend making a separate observation field, like "Mayfly life stage" or something.

How should we search for this now that these are removed from the "more filters"? Thanks!

When looking at an observation with this observation field, you can click the name of the observation field and click the "Observations with this field and value" link. Same goes for annotations.