PIERIS WOLLASTONI.
Plate I.—Fig. 1.
This butterfly is allied to the Cheiranthi, but is a distinct variety, only recently met with in this island. Mr. Butler, of the British Museum, has named and fully described this insect, which has hitherto only been found in Madeira, but is now for the first time enumerated in the list of Teneriffe Lepidoptera. It is somewhat smaller than the Cheiranthi, measuring not more than two and a half inches in expanse. The reverses of the female (which is illustrated) and of the male are of a grey tinge, in place of the rather bright yellow shade of the Cheiranthi, sprinkled over with fine black dots. The apical patch is also grey, and both sexes have long black spots on the fore-wings. The upper surface is cream-white; the female has two distinctly marked long black spots on the fore-wings; the male having none. The black apical markings are similar in both sexes, and a small black spot is seen on the inner margin of the hind-wing of both male and female.
There are no observations to record on the caterpillar and pupa, as the specimens of the fly (one of which is illustrated) were netted; but very possibly larvæ may be found gregariously with the Cheiranthi in like manner to the Callirrhoe and Atalanta, or the Plexippus and Chrysippus.
The specimens taken were netted about 500 feet above the sea.