95 



spends to NapCEce, is far removed from that form. Pallida $ is 

 immaculate on both sides, its co-form Castoria has a spot on 

 primaries, otherwise immaculate on both sides. The common ? 

 has a gray border to inner margin of primaries, and a spot on same 

 wing: otherwise immaculate on both surfaces. Olcracea wstiva 

 $ is immaculate on both surfaces, the ? also, except that a few 

 scales sometimes suggest a spot on upper side, and sometimes 

 there is a slight and pale bordering to inner margin. 



But Napcece $ has o)ic or two black spots and marginal 

 border, two spots on tinder side, a spot at outer angle of hind zvings 

 on both sides ; the zvhole costal idge on under hind wing deep yellow, 

 things never seen in American examples. The <? has two or 

 three large and deep black spots, &c. In fact, THE $ Nap^^ 

 RESEMBLES BrASSICtE $ MORE CLOSELY THAN IT RESEMBLES 

 THE FEMALE OF THE CORRESPONDING AMERICAN FORM. 



4. ViRGINlENSlS. I described this form as Pieris Virgtni- 

 ensis in Butterflies of N. A., vol. i, and gave accurate figures of both 

 sides of both sexes. The male above is more or less obscured by- 

 brown, or dusted with brown, and often to a considerable degree. 

 In some examples the brown scales are scattered over the whole 

 surface, but are dense on apex, costa and basal half of primaries, 

 and at base and along the principal nervures of secondaries ; a 

 gray patch also on costa of secondaries. Under side always 

 white {Oleracea and Pallida are most often yellow), the nervures and 

 branches bordered zuith ashy-brozvn of a shade not found in any 

 American form except Hulda. Individuals vary in the extent of 

 this brown, from slight to very considerable. The female has the 

 upper surface more obscured, and the brown edging to the 

 nervures and branches is sometimes so extensive as almost to 

 conceal the ground color, as in Hulda. Virginicnsis is smaller than 

 Oleracea, the males averaging 1.7, and no female examined ex- 

 panding over 1,9 inch. The wings as a rule are longer and 

 narrower than Oleracea, though the latter, as before stated, varies 

 in this respect ; and they are delicate as in Oleracea cestiva if 

 any thing more delicate and thinner. 



The first examples of Virgmiensis ever seen by me were re- 

 ceived from Mr. Wm. Saunders, the $ having been taken in On- 

 tario, the s at Quebec. They were sent as Oleracea with several of 

 the latter. I have three males from north and south Colorado. In 

 my collection I have 12 examples, 5 being those mentioned, and 

 7 from Coalburgh. Mr. Mead has taken a female at Stony 

 Clove, Hunter, N. Y., on the Catskill Mountains. 



For several years, and up to 1872, a few individuals were 

 taken at Coalburgh in each year, usually in April, once in last half 

 of March, and once only in May, and there was no other Pieris 

 flying at the same season in these years except Ver)ialis, the spring 

 form of Protodice, and that was seen very rarely, some years not 



