Canadian Butterflies. 347 



•when they issue from its body through a multitude of minute holes 

 and spin their cocoons of yellowish silk in little heaps on each side 

 of the now shrivelled skin of their victim which then falls lifeless 

 to the ground. 



Only three species are found in North America. They are 

 JP. oleracea, protodice, and casta. The two first of these occur in 

 Canada, and the third which is very closely allied to oleracea, but 

 differs in being less strongly marked, and in having no tinge of yel- 

 low on the underside, is described by Kirby in his " Northern Zo- 

 ology" as inhabiting the Hudson's Bay territories. P. cleomes 

 of Boisduval is an aj^oria. 



Species 1. — Pieris Oleracea, the Grey-veined White. 



Pontia oleracea (Harris), Emmons, Agri. N. Y, Ins., p. 204. 

 All the wings above pure white, the base and tips slightly dusky, 

 the nervures blackish brown, and strongly marked ; underside 

 also white, slightly tinged with yellowish green, the nervures on 

 the posterior pair edged with dusky scales ; antennae with the club 

 black, tipped with brownish white, the rest brown palest on the 

 underside, and faintly annulated with white ; palpi white, thorax 

 and abdomen black, clothed with Avhitish hairs ; legs black ; ex- 

 pansion of the wings 2 inches. 



Dr. Harris, who first named this species, states that the female 

 lays her yellowish eggs upon the leaves of cabbages, radishes or 

 turnips about the first of June ; that they are hatched in about a 

 week, and that the caterpillars attain their full size in three weeks ; 

 they measure an inch and a half in lengjth, and are of a pale green 

 colour, and feed indiscriminately upon every part of the leaf. They 

 remain about eleven days in the pupa state. 



This species is not mentioned by Boisduval. It appears in May, 

 and continues up to September. It is common in the Northern 

 States, Upper Canada, and the Eastern Townships. It also occurs 

 about Montreal, St. Hilaire, and Quebec, but does not appear to be 

 very numerous at either of these places, and we do not remember 

 to have noticed it at Sorel. 



Species 2. — Pieris Protodice. 



Plate vi., fig. 3, male ; 4, female ; 5, female underside. 



Pieris Protodice, Boisduval and Leconte, Ico., &c., des Lepidop- 



teres, &c., de I'Amer. Sept. t. 1, p. 45, pi. xvii, fig. 1, 2, 3' 



The anterior wings are white with a large, black, trapezoid spot 



placed in the middle before the margin, and an oblique, spotted 



