Ultrastructure of scales in and around the scent glands patches of P. alveus A Scent glands patches B Scales in the scent glands patches (S1: The first scale (androconium); S2: The second scale) C Ultrastructure of the first scale in the scent glands patches D Type 1 scales around the scent glands patches E Ultrastructure of type 1 scale around the scent glands patches F Type 2 scales around the scent glands patches G Ultrastructure of type 2 scale around the scent glands patches.