Janus

Janus is a genus of stem sawflies in the family Cephidae, established by Stephens in 1829. These insects belong to the suborder Symphyta, the primitive sawflies that lack the narrow waist characteristic of most other Hymenoptera. The genus name Janus refers to the Roman two-faced god, though the specific morphological basis for this naming in the context of these insects is not documented in available sources. Members of this genus are part of a small family of herbivorous insects whose larvae bore into plant stems.