2. Antennae three-segmented; terminal segment elongated and often U-shaped in male...(argid sawflies) ARGIDAE
Antennae more than three-segmented.....3
5. Antennae with 13 or more segments; serrate....(conifer sawflies) DIPRIONIDAE
Antennae normally nine-segmented; filiform....(tenthredinid sawflies) TENTHREDINIDAE
10. Antennae long, with 16 or more segments...11
Antennae with fewer than 16 segments.... 12