No one, so far as I know, has yet attempted to explain, in accordance with Mr. Darwin's views, a life-history in which the mouth is first mandibulate and then suctorial, as, for example, in a butterfly.
"On the Origin and Metamorphoses of Insects"
Sir John Lubbock
Among these insects, while the mouth of the imago is of the normal mandibulate type adapted for eating solid food, the larval mouth is constricted and the slender mandibles are grooved for the transmission of liquid food.
"The Life-Story of Insects"
Geo. H. Carpenter