What is the difference from the oral apparatus of lice and beetles?

Lice have a so-called piercing-sucking mouth apparatus, while in beetles it is a gnawing one. Lice are a suborder of miniature obligate ectoparasites. They are credited to the squad of lice. They can be called precisely highly specialized parasites.
Beetles are precisely the order of insects. Some members of this order can grow up to twenty centimeters in length. There are about four hundred species of beetles on our planet.