Two other allied families, the Cercopidae and Jassidae, are more numerously represented in our islands.
Various, Encyclopaedia Britannica, 11th Edit...(2012)
Valve: a small, transverse or triangular piece behind the last full ventral segment, at base of plates in male Jassidae and allies.
Smith, John. B., Explanation of Terms Used in Entomo...(2010)