THE TRIBE OF THE CRESCENT-SPOTS 135 



with many other silver spots scattered over the under sur- 

 face of the hind wings. 



Meadow Fritillary {Brenthis bellona) . Expanse 2 inches. 

 Easily known by the absence of silver spots on all the 

 wings. The wings are long in proportion to their width. 



THE TRIBE OF THE CRESCENT-SPOTS 



The members of this tribe have the following combina- 

 tions of characters: scaly antennae, with a short stout 

 club some three times as long as broad, and a pair of 

 slender palpi in which the terminal joint is only about half 

 as long as the middle one. There may or may not be a 

 slight ridge running lengthwise of the naked part of the 

 antennal club. 



Although more than fifty distinct species belonging to 

 this tribe have been found in North America, very few 

 of these are distributed through the eastern part. Only 

 four are so abundant and widely distributed that they need 

 be treated of here. 



Baltimore Checker-spot 



Euphydryas phaeton 



To the naturahst those islands in the seas which are 

 remote from the mainland have long been of especial in- 

 terest. The life upon them is likely to show the results 

 of many generations of living under unique conditions. 

 The plants and animals are generally distinctive, many of 

 the species having characteristics which differentiate 

 them markedly from those upon the mainland. They 

 show in a thousand ways the effect of isolation and so are 



