Sometimes caterpillars continue to feed in the autumn instead of hibernating. This, at least, has happened to Mr. Frohawk on two occasions, notably in 1893, when he had several individuals of a brood, from eggs laid by a female of the _valesina_ form, that departed from the usual custom of their kind by feeding and growing until they eventually passed through all the stages and emerged perfect butterflies in September and October of that year. Something similar occurred in a brood that he was rearing in the autumn of 1895, but on this occasion only one caterpillar continued to feed beyond the normal time. The English name by which we now know this, the largest of the six British Argynnids, seems to have been given to it by Moses Harris in 1778. Sixty years or so before that date it was called the "Greater Silver-streaked Fritillary." Fortunately, in this case, as in others where the vulgar tongue is entomologically concerned, the law of priority does not apply, so that the name Silver-washed, which so well expresses the underside ornamentation, may be retained. [Illustration: FIG. 25. =Aberration of var. valesina.=] The butterfly is probably to be found in most of the Southern English and Welsh counties, especially where there are extensive woods. In North Devon, however, it occurs in places where there is not much in the way of woodland. It is abundant in the New Forest, and also in some parts of Ireland. Although it has been observed as far north as the Clyde, it is scarce in North England and Scotland. The _valesina_ form is to be seen, in July and August, in the New Forest every year, and sometimes in numbers. This variety has been reported from Kent, Sussex, Devon, and Dorset; also from "near Reading" and "the border of Hertfordshire." [Illustration: _Pl._ 50. =Silver-washed Fritillary.= 1, 3 _male_; 2, 4, 5 _female_.] [Illustration: _Pl._ 51. =Silver-washed Fritillary.= _Egg, natural size and enlarged; caterpillar and chrysalis._] Abroad, the typical form is distributed through Europe and Asia to China, Corea, and Japan. The _valesina_ variety is uncommon in Northern Europe, but in some parts of China it seems to be the dominant form. The High Brown Fritillary (_Argynnis adippe_).