GEOGRAPHICAL DISTRIBUTION. 265 



balance in the sub-family is more than restored 

 by the superior number of Blues in Europe, 

 where there are thirty-eight species to our thir- 

 teen ; fourth, that while the numbers of the Typ- 

 ical butterflies on the two continents are almost 

 equal, there is no similarity of representation in 

 the groups composing the family, excepting in the 

 Whites ; for the Orange-tips (Frugalia) number 

 seven in Europe and two in America, the Yel- 

 lows ten in Europe and twenty in America, the 

 Swallow-tails [Fig. 190] 

 three in Europe and nine in 

 America, and the Parnas- 

 sians (Parnassii) six in Eu- 

 rope and none in America. 

 Notwithstanding such 



,-! . ,, FIG. 189 Euphyes Metacomet, 



Striking Contrasts, there nat. size ; the left side represents 



the upper surface of the male ; the 



are many apparent resem- right the upper surface of the 



female, attached to the body. 



blances ; but upon analysis 



nearly all of these disappear. Take, for example, 

 the two most striking cases, the Angle- wings 

 and the larger Skippers [Fig. 191], in both of 

 which the numbers are the same in the two coun- 

 tries ; in the latter only two of the eight Amer- 

 ican and four European genera are common to 

 both countries, and in these two the representa- 

 tion is very unequal, one genus having six spe- 

 cies in America against two in Europe, and the 

 other fourteen in Europe and two in America. 



