California Maple Aphid and Nymphs | Periphyllus californiensis
Adult female California maple aphid (Periphyllus californiensis) with a cluster of nymphs gathered on the underside of a leaf of a Japanese maple tree (Acer sp.) in the autumn. A couple of the nymphs appear to be in the process of moulting. These aphids go through several nymphal instars before taking on adult form.