. The moths of the British Isles . 2/Y. 137. / .1, 2. Brindled White-spot. >c 5-7. Grey Birch. ;, 4. Square , 9. Horse Chestnut. A317. GREY BIRCH. 317 sub-marginal line is whitish, inwardly shaded with dark greyish,especially at the middle and towards the front margin. Thehind wings have two cross lines corresponding with the firstand third on the fore wings. There is a good deal of variationin the amount of dark speckling, and this is occasionally soheavy that the insect becomes dark grey in colour ; I havetaken such specimens at Oxshott in Surrey. Dark aberrations areperhaps more fr
. The moths of the British Isles . 2/Y. 137. / .1, 2. Brindled White-spot. >c 5-7. Grey Birch. ;, 4. Square , 9. Horse Chestnut. A317. GREY BIRCH. 317 sub-marginal line is whitish, inwardly shaded with dark greyish,especially at the middle and towards the front margin. Thehind wings have two cross lines corresponding with the firstand third on the fore wings. There is a good deal of variationin the amount of dark speckling, and this is occasionally soheavy that the insect becomes dark grey in colour ; I havetaken such specimens at Oxshott in Surrey. Dark aberrations areperhaps more frequent in the north of England, but the speciesis more local and less plentiful in that part of the country. The caterpillar, which may be beaten from birch, and some-times alder, in July, is bright apple green with yellowish lineson the sides and back; the ring divisions are yellow, and thehead is tinged with that colour. (Adapted from Porritt.) Some-times the caterpillars are brownish, or greenish grey in generalcolour. The moth
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