Characters of tibiae.

(A-C) Spinules and rastral spines present on distal part of tibiae (alate viviparous females): (A) Drepanosiphum platanoidis; (B) Drepanaphis acerifoliae; (C) Yamatocallis tokyoensis Drepanosiphinae SEM. (D-F) Only spinules present on distal part of tibiae (apterous viviparous females): (D) Drepanosiphoniella aceris Drepanosiphinae; (E) Periphyllus testudinaceus; (F) Caricosipha paniculatae Chaitophorinae SEM. (G-N) Distal part of tibiae smooth (apterous viviparous females): (G) Chaitophorus populeti; (H) Trichaitophorus koyaensis SEM; (I) Lambersaphis pruinosae; (J) Pseudopterocomma hughi LM; (K) Atheroides serrulatus; (L) Chaetosiphella stipae; (M) Laingia psammae; (N) Sipha (Rungsia) maydis Chaitophorinae SEM.