2 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 71 



northern form) entirolj'^ absent; the eight orange spots along the 

 margin of the wing are smaller, due to the broadening of the band 

 of black scales along the veins between them and a rounding off of 

 their outer angles by an invasion of black scales; they are frequently 

 very much reduced in size, especially in the females, and may be 

 almost wholly obliterated by black scales; in the northern form the 

 three apical spots are usually noticeably larger than the others, ex- 

 tending inward between the veins for a greater distance, but in the 

 southern form these spots may be all of the same size, as is usual in 

 the females, or they may decrease regularly from the apex poste- 

 riorly, as is usual in the males; on the hind wings there is very seldom 

 any trace of orange except for the submarginal row of spots, which 

 are restricted by a broadening of the narrow black border of the 

 wings and a heavier development of black scales along the veins, 

 especially in the females; beneath, the marginal band of orange 

 spots is narrower than in the northern form with a more deeply cre- 

 nate inner margin, and the orange markings in the basal half of the 

 hind wings are more or less reduced by a greater development of 

 black along the veins and an invasion of black on all sides; the light 

 markings on the under side are also purer white than in the north- 

 ern form. 



We take great pleasure in naming this forjn for our friend Dr. 

 William Schaus, who first took it at Alexandria, Virginia, several 

 years ago, and whose specimens we have been privileged to study 

 in connection with our own. 



Cojnparisons. — For comparison with our specimens from Cabin 

 John, Maryland, we have before us a series of nine examples from 

 Stoneham, Massachusetts, which were collected on June 27, 1926, and 

 sent to us by our friend Mr. C. V. Blackbiu-n; a female from Lincoln, 

 Massachusetts, July 7, 1923; a female from Weston, Massachusetts, 

 July 9, 1923 (pi. 1, figs. 3, 4); and three males from Newtonville, 

 Massachusetts, July 11, 1923, and June, 1897, all taken by ourselves. 

 Of the northern form we have also examined four males from Ken- 

 dall, New York, three males and three females from New Jei-sey, and 

 a male without locality. Of the southern form we have examined, 

 in addition to our own series, five males and five females from Alex- 

 andria, Virginia, collected by Doctor Schaus. 



We find no difficulty in distinguishing specimens from New Jei-sey 

 and northward from tliose from the vicinity of Washington. Typi- 

 cal examples of each are very distinct, because of the deeper and 

 more lustrous black of the latter, the brighter white of the hght spots, 

 and the restriction of the orange markings. 



One of the specimens from Stoneham, Massachusetts, is nearly as 

 deep black as the southern form; but it has the typical orange mark- 

 ings of the northern. Four of the specimens from Cabin John are 



