THE NYMPHS 



their nephews and nieces of the next brood, the 

 offspring of their more ambitious brothers and 

 sisters that completed their growth and produced 

 eggs for the second brood. 



The species occurs from Canada to North 

 Carolina and west through the Mississippi Val- 

 ley. It is single-brooded in the North and 

 probably both single- and double-brooded in 

 the South. 



The gold-barr'd butterflies to and fro 



And over the waterside wander' d and wove, 

 As heedless and idle as clouds that rove 



And drift by the peaks of perpetual snow. 



Joaquin Miller. 



The Pearl Crescent 



Phyciodes tharos (Phy-ci-o'des tha'ros) 



Plate XXII, Fig. 9, io, 12, 13 



This species varies greatly in the markings of both upper 

 and lower surface; but it can be distinguished from the allied 

 species found in the East by the characteristics given in the 

 table on page 124. It is not always easy to distinguish the 

 sexes; but usually the yellow of the outer half of the fore 

 wings is more broken by black lines in the female than in the 

 male, and frequently the sinuous row of spots just beyond the 

 middle of the fore wings is of a lighter color in the female. Ex- 

 panse of wings one and one-half to one and seven-tenths inches. 



The species is dimorphic. The two forms are not dis- 

 129 



