PIERTS. 321 



10. P. marginalis Scudder. Pr. Best. Soc. N. H. VIII, Sept. 1861, 183. 



This species is most closely allied to the preceding P. venosa. 

 The ground color is as in venosa, but almost devoid of markings ; 

 base of all the wings black ; costal border of primaries with a nar- 

 row black band, extending about half its length ; a few grayish 

 scales at the tip of wings ; outer edge of primaries, and posterior 

 edge of secondaries with a very fine black line, slightly swollen at 

 the tips of the nervures ; fringe white ; beneath as in P. venosa, 

 with the secondaries and apex of primaries more yellowish ; males 

 and females alike in their markings. 



Body black, with some white hairs above, and a considerable 

 number of yellowish white ones beneath ; antennae as in P. venosa. 

 The wings expand two inches. 



I have seen only two specimens (1 ?, 1 J") which are in the 

 Museum of Comparative Zoology. The female came from the Gulf 

 of Georgia, and the male from Crescent City, California. They 

 were obtained by Mr. Agassiz. 



Scudder. 



11. P. pallida Scudder. Pr. Bost. Soc. N. H. VIII, Sept. 1861, 183. 



Above, very pale-yellowish, nearly white ; base of both wings 

 and basal half of costal border of primaries dotted with grayish 

 scales ; whole costal edge of primaries black; the male has, in ad- 

 dition, a band of grayish scales on the posterior border of prima- 

 ries as in the male of P. venosa, turned abruptly towards, and 

 sometimes interrupted at the angle, extending to the third inferior 

 nervule ; and in the middle of the space between the first and 

 second inferior nervules, as in both sexes of P. venosa, a cluster 

 of grayish scales. 



Beneath, secondaries and apex of primaries yellowish, with some- 

 times a few indistinct grayish scales scattered along the nervures, 

 otherwise quite immaculate. 



Body, above black, with scattered yellowish hairs ; beneath yel- 

 low ; antennas as in P. venosa. The wings expand two inches. 



This species was obtained by Mr. Alex. Agassiz, at the Gulf of 



Georgia. I have had before me five specimens (3 9,2 g ), which 



are in the Museum of Comparative Zoology. 



Scudder. 



21 



