These larval pictures are actually a different specimen of the same species collected from the same locality at the same time. As noted with the adult photo, the collection date for the adult is actually the date it was collected as a larva (the adult was reared in the lab). I would have left no date except the system does not allow for it. If you leave the date space blank it autofills to Dec. 1, 1969 (and that is clearly incorrect).

is reserved for images of the same exact individual insect, not same species, same insect. So I unlinked, and added thumbs, the approved method. Then I removed the date on the adult (just deleted the whole line). I think that is what you intended?