The caterpillar has grown about 1 mm in length and has also increased in diameter.
The caterpillar's head is now smaller in diameter than it's body. The tentacles still have not formed.
This caterpillar is about 7 days older than the caterpillar that hatched Tuesday.
The football shaped openings on the side of each body segment are called "Spiracles" and are the openings to the respiratory system of the caterpillar. There is a spiracle opening on each side of the body segments of the thorax and abdomen and connect to a web of tracheae that supplies oxygen to the body.