About Perizoma alchemillata (Linnaeus, 1758)
This species, Perizoma alchemillata, is very similar in colour and pattern to Perizoma affinitata, but is generally smaller, and often has a double indentation on the inner margin of its band. Compared to Perizoma affinitata, it has clearer and more regular white marks at the hindmargin of the forewing, the pale band on its dark hindwing tends toward obsolescence, it has black dashes on the veins in the distal area of the forewing, and it is generally less variable. A named form, peterseni, has a well-expressed white antemedian band; the postmedian white band is also generally somewhat widened, and sometimes a complete white subbasal band is even present. This form is the prevailing type in Estonia and possibly Scandinavia, is more common in Scotland than in England, and can occur as an aberration in many other localities. The larva of Perizoma alchemillata is short and sturdy, with some short bristles. It is light green with two red longitudinal stripes along its back. This species is distributed across Europe, Asia Minor, Transcaucasia, Siberia, and the Altai Mountains.
