|Head out of the bag - REK from WOLF|
This is the common Evergreen Bagworm - Thyridopteryx ephemeraeformis. Most of us know them only by their shelters. Back then I would cut them open to extract the "worm," never appreciating that it might actually be a gravid mother full of eggs! Legless and grub shaped it wasn't impressive at all.
|Adult male - Andy Reago & Chrissy McClarren|
Only the head and thorax come out of the bag as they move along feeding and dragging their bags with them while going through 7 molts in around 4 months. They will continually enlarge their bags using silk and what ever vegetation they are on, ranging from cedar to sycamores. Finally they attach the bags to a branch and pupate in it.
|Ted C. McRae|
Pictures of the various instars.
More information is at Beetlesinthebush
and detailed information is in this Smithsonian Institute paper.