63 



PIERIDAE 



PlERIS NAPI FRIGIDA Scild. 



In our Contributions Vol. Ill, p. 58, we referred to this race 

 as the spring form of acadica Edw. and figured our conception of fri- 

 gida on PI. VII, Figs. 1, 2. This identification was based on two Lab- 

 rador specimens in the Scudder Collection, evidently the 2 $'s men- 

 tioned by W. H. Edwards in his article on P. napi (1881, Pap. I, pp. 

 92/3) and with which our figured specimen (fig. 1) agreed exactly. 



A recent visit to Cambridge, combined with a careful study of 

 Scudder's original description and the discovery in the main collection 

 of a specimen under the name frigida labelled "Labrador, Packard", 

 has led us to the conviction that the 2 5 's in the Scudder collection 

 cannot be considered as types or as even typical of frigida. 



Scudder's original description was drawn up ostensibly from 2 

 S 's and 2 9 's collected on Caribou Is. Straits of Belle Isle by Prof. 

 A. S. Packard ; it is therefore reasonable to suppose that the specimen 

 labelled "Labrador, Packard" in the main Cambridge Collection is 

 at least one of the type lot, especially as it agrees far better with Scud- 

 der's rather vague description than do the 2 cj 's in the Scudder col- 

 lection which further show no evidence on the label of having been 

 received from Packard. This Packard specimen is labelled $ but 

 seemed to us to be a 9 although the abdomen is so badly crushed 

 that with a low power lens (the only one available) it was impossible 

 to definitely determine the sex. 



A study of the original description has shown several points of 

 discrepancy between the text and the so-called frigida specimens of 

 the Scudder collection ; in the first place the under surface of the 

 wings is given as "dirty-white, tinted with very pale greenish yellow" 

 whereas Scudder's S 's and our series from Newfoundland show a 

 rather brilliant yellow coloration on secondaries and at apex of pri- 

 maries ; they further show on upper side of primaries considerable 

 apical dark suffusion, (usually more so than in our figured $ ) and 

 the 9 's have the two subterminal round spots of primaries fairly 

 well developed ; none of these latter points are mentioned in the descrip- 

 tion and indeed the fact that Scudder compares frigida to olcracea 



