288 NORTHERN ZOOLOGY, 



? 



Brown marginal band of the primaries broader, internally more deeply indented than those of 

 the male, and spotted irregularly with yellow. 



The American specimens of C. Edusa seem to vary from the English as described by Mr. 

 Stephens, in having the black discoidal spot on the underside of the primary wings ocellated, and 

 from that described by Latreille, 3 in having the series of marginal spots on the underside of the 

 secondaries blind. 



In the two varieties of the male above described, the passage to a simple eyelet on that wing 

 from the sesquialterous one, is by the disappearance of the silvery pupil in B. 



CLXXVIII. Genus PONTIA. Fab. 



(403) 1. * Pontia casta. Chaste Pontiu. 



P. (casta) alls rotundatis integerrimis albis ; primoribus bast costa nigricanti. 



Chaste Pontia, wings rounded, very intire, white ; the primary with the costal nervure blackish at the base. 



PLATE III, FIG. 1. 



Expansion of the wings 2 inches. 



Three specimens taken in Lat. 65°. 



DESCRIPTION. 



Antennas black annulated with white : wings white, the primaries at the anterior margin sprinkled 

 with blackish scales ; secondaries underneath with a few scattered black scales accompanying the 

 nervures; the wings are rounded and very intire. 



I received a species of this genus from Dr. Harris under the name of Pontia oleracea which 

 P. casta approaches, but that is more strongly marked ; its secondaries are pale-yellow underneath, 

 and, as in P. Napi, accompanied on both sides by a broad greenish line. 



3 N. D. D'H. N. vii, 338. 



