Dipterous insect and Two-winged insects

Dipterous insect noun - Insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing.

Two-winged insects is a synonym for dipterous insect. In some cases you can use "Two-winged insects" instead a noun phrase "Dipterous insect".

Two-winged insects noun - Insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing.

Dipterous insect is a synonym for two-winged insects. You can use "Dipterous insect" instead a noun phrase "Two-winged insects".