NORTH AMERICAN BUTTERFLIESo 21 



33. FIERI S NELSONIEdw. 



Nelson's "White Butterfly. 

 Similar to P. beckerii but diifers in having the markings on fore 

 wings above, rather more sharply defined, and the spot at the end of 

 central cell is confined to the interspace between the two veins, not ex- 

 tending above the upper, Fig. 12, a. Expands about 2.00. Habitat. 

 St. Michael's, Alaska. 



34. PIERIS OCCIDENTALIS Reak. 

 Western Cabbage Butterfly. 



White, with base of wings powdered with violaceous and grayish. 

 There are two rows of grayish spots crossing the fore wings, one mar- 

 ginal and the other sub-marginal. Hind wings, Avith a marginal row 

 of arrow-shaped spots. Beneath, the markings of both wings are re- 

 peated, but there is an extra spot near the inner angle of fore wings, 

 and the ^^eins of the hind wings are broadly bordered with bright yellow- 

 ish green. The apex of fore wings and whole surface of hind, are strong- 

 ly tinged with yellow. 



Diifers from P. protodice, in having no spot on end of central cell 

 of fore wings. Expands from 1.70 to 2.00. Habitat, Rocky IMountains 

 to the Pacific, from California to Oregon, and north into British Amer- 

 ica. 



Calyce Edw. The above described is the summer form ; the pres- 

 ent is the winter and differs from the summer, in being whiter, only 

 slightly tinged with yellow, but the black markings are rather more de- 

 cided and there is a greenish overwashing below. 



35. PIERIS PROTODICE Bd-Lec. 

 Banded White Butterfly. 



Male, white, faintly tinged with greenish, with a marginal row of 

 triangular spots of dull black on fore Avings, within which is a shorter 

 row, the two being connected by faint edgmgs along the veins. There 

 is a large spot at end of cell that encloses a cur\ed transverse line of 

 white, and below this, on the lower border of the wing, is another spot, 

 paler than the last, and the bases of both wings are grayish, otherwise 

 the hind wings are unmarked. Beneath, the markings are repeated 

 and the veins of hind wmgs are margined with brown, tinged with or- 

 ange and greenish. The tips of the fore wings are also overwashed with 

 the same colors. 



