Presence of a prolonged head does not always mean the insect
has sucking mouthparts. Scorpionflies (Mecoptera) for example have a head prolonged
ventrally into a beak-like structure with chewing mandibles that move sideways.
Snout beetles (weevils) have the front of the head prolonged into a snout with
chewing mandibles at the tip.
images of the mouthparts from more than one angle are often critical for identification.