The food plants of _Cardamines_ include the cuckoo-flower (_Cardamine pratensis_) and the bitter cress (_C. impatiens_), after which the insect is named, also water-cress (_Nasturtium officinale_), winter cress (_Barbarea vulgaris_), rock cress (_Arabis perfoliata_), hedge mustard (_Sisymbrium officinale_), Jack-by-the-hedge (_S. Alliaria_), wild mustard (_Brassica Sinapis_), &c., and the eggs of the butterfly may be found on these during May and June. The caterpillar (Plate VIII, fig. 2) is green, with a white stripe on each side, and its body is covered with short hair. In July it is fully grown, and ascends a stem of the food plant to prepare itself for its long winter sleep. The chrysalis (Plate VIII, fig. 8) is a very peculiar object. Both ends are much elongated and sharply pointed; and the foremost extremity stands out at an angle with the stem to which it is attached. This butterfly should be looked for during April and May, but in mild seasons it may often be met with in March. _The Wood White_ (_Leucophasia Sinapis_) The distinguishing feature of this butterfly (see Plate II, fig. 1) is the extreme lightness and delicacy of its build. Its wings are narrow, and rounded at the tips; and the only mark to relieve the white ground of the upper side is a squarish blotch at the tip of the fore wing, and even this is either very indistinct or entirely absent in the female. The under surface is clouded with a pale greenish tint. This insect may be looked for in May and again in August, in paths and clearings in woods, where it moves along with a slow but steady flight, hardly ever seeming to rest for a moment. It is not by any means a common butterfly, but is very widely distributed, and sometimes appears in considerable numbers in certain favoured spots. Among the localities recorded may be mentioned Torquay, Exeter, Plymouth, South Dorset, New Forest, Reading, Darent Woods, Morecambe Bay, Haslemere, Windermere, &c. The caterpillar is of a beautiful green colour, and is covered with short whitish hairs. A darker green stripe runs down the middle of the back, and a bright yellow stripe along each side. Its food plants are the tufted vetch (_Vicia Cracca_), bird's-foot trefoil (_Lotus corniculatus_ and _L. pilosus_), bitter vetch (_Lathyrus tuberosus_), and the everlasting pea (_L. sylvestris_). The chrysalis is a very beautiful object. Its colour is a delicate green, tinged with pink; and the wing-cases project in beautiful curves much beyond the general surface. _The Pale Clouded Yellow_ (_Colias Hyale_) The ground colour of this butterfly (Plate II, fig. 2) is very variable. It is usually a sulphury yellow, and on this account the insect is commonly known as the Clouded Brimstone; but sometimes the yellow is exceedingly pale--almost white--and tinged with green.