Where does the old skin typically split to allow the caterpillar to emerge during a molt?

Answer

Along the back of its head capsule

The process of emerging usually involves the caterpillar pushing its way out, splitting the restrictive old skin along the back of its head capsule.

Where does the old skin typically split to allow the caterpillar to emerge during a molt?

#Videos

Caterpillar Shedding - YouTube

skinlarvacaterpillarSwallowtailmolt