The caterpillar when full grown is green above, with black warts, from which arise whitish and blackish hairs. There is a darker line along the back, and a yellow line low down on the sides. Underneath the colour is whitish-grey. The spiracular line is dusky, but not conspicuous, and the spiracles are blackish surrounded with yellow. It has been stated that caterpillars fed upon hedge garlic and horseradish produce light butterflies, and that those reared on mignonette and watercress produce dark butterflies. Barrett mentions having reared a brood of the caterpillars upon a bunch of watercress placed in water and stood in a sunny window, but he does not refer to anything peculiar about the butterflies resulting therefrom. He states, however, that from eggs laid in June the earliest butterfly appeared within a month, and the remainder by the middle of August, only one remaining in the chrysalis until the following June. [Illustration: _Pl._ 10. =Green-veined White Butterfly.= _Eggs, natural size and enlarged; caterpillar and chrysalis._] [Illustration: _Pl._ 11. =Small White Butterfly.= 1, 2, 4 _male (spring)_, 3 _do. (summer)_; 5, 7, 8 _female (spring)_, 6, 9, _do. (summer)_.] Caterpillars may be found in June and July and in August and September. The chrysalis is green in colour, and the raised parts are yellowish and brown. This is the most frequent form, but it varies through yellowish to buff or greyish, and is sometimes without markings. Generally distributed throughout the British Islands, but its range northwards does not seem to extend beyond Ross. In Europe it is generally common, and extends through Western and Central Asia to Siberia, and, according to Leech, is found in North Japan. In Amurland and Corea it is represented by the form _orientis_, Oberth. It occurs in North-West Africa, the Canary Isles, and the Azores. In America it is found in the Northern States and in California. The Bath White (_Pieris daplidice_). The Bath White (Plate 14) is such a rare visitor to this country, that any one who captures a specimen may congratulate himself on the event. During the whole of the last century not more than sixty specimens seem to have been recorded as taken in England, and ten of these were captured between 1895 and the present time. Nearly all of these were netted on the south or south-eastern coast, and in the months of July or August, but chiefly the latter. The occurrence of specimens in May or June appears to be quite exceptional.