748 AN INTRODUCTION TO ENTOMOLOGY 



it is confined to the males. Nearly all of our species are confined to 

 the Far West. The two following occur in the East. 



The falcate orange-tip, Eiichloe geniltia. — In this species the 

 apex of the fore wings is hooked, reminding one of the hook-tip moths. 

 In the males there is a large apical patch. This butterfly is fcvmd 

 throughout the southeastern part of the United States, not including 

 Florida. It occurs as far north as New Haven, Conn. It is nowhere 

 abimdant. The larva feeds on rock-cress, bitter cress, shepherd's 

 purse, Sisymbrium, and other Cruciferce that are slender in form. 



The olympia orange-tip, Synchloe olympia. — In this species the 

 orange patch is wanting in both sexes. There is a conspicuous black 

 bar at the end of the discal cell of the fore wings, and the apical 

 portion of these wings is gray including a large irregular white band 



The larva is striped lengthwise with pale slate color and bright 

 yellow; the feet, legs, and head are grayish green. It feeds on 

 hedge-mustard and other Cruciferffi. 



III. THE YELLOWS 



The yellows are easily recognized by their bright yellow colors, 

 although in some species whitish forms occur. They abound almost 

 everywhere in open fields, and are common about wet places in roads. 

 To this group belong the larger nimiber of our pierids. 



The roadside butterfly or the clouded sulphur, Eurymus philodice. 

 ■ — The wings above are rather pale greenish yellow, with the outer 

 borders blackish brown. Figure 956 

 represents the male; in the female 

 the border on the fore wings is 

 broader, and contains a sub-margin- 

 al row of yellow spots. The discal 

 dot of the fore wings is black, that of 

 the hind wings is orange. The imder 

 surface is sulphur-yellow. 



This species is dimorphic. The 

 second form is represented only by 

 the female sex, and differs in having 

 the ground-color of the wings white Fig- 95(>—Etiryi}ms philodice. 

 instead of yellow. 



This butterfly often occurs in large niimbers in muddy places_ in 

 country roads, for this reason it may be known as the roadside 

 butterfly. It is also known as the clouded sulphur. Its range extends 

 from the mouth of the St. Lawrence to South Carolina and west- 

 ward to the Rocky Mountains. Its larva feeds upon clover and 

 other Leguminosse. 



The orange sulphur, Eurymus eurytheme. — This species closely_ re- 

 sembles the preceding one in size, shape and markings. The typical 

 form differs from E. philodice in being of an orange color above instead 

 of yellow. This butterfly is found chiefly in the Mississippi Valley 

 and west to the Pacific Ocean ; it is also found in the Southwestern 



