ANCESTRY AND CLASSIFICATION. 



253 



indicate with little doubt the progress of events 

 in the geologic history of higher lepidopterous 

 life, and leave a record of advance 

 which is completely falsified by 

 removing the swallow-tails to the 

 summit of the order. Attention has 



recently been 



drawn to one of 



these features by 



Bates, who at the 



view. 



same time has pro- 

 posed one of the most rational 

 systems yet advanced ; it has, 

 however, been known and used 

 in dividing butterflies since the 

 time of Linne and Geoffroy. I 

 refer to the 

 s t r u c ture of 

 the front legs, 

 where funda- 

 FIO. i73.-side view of mental distinc- 



forc legs and appendages 



of Euphoeades Troilus, tlOUS O C C U r 



X 5 ; a, tibia and tarsus of 



SffinVtougSteMle. flies In ^ 



lowest family, or skippers [Fig. 

 172], as in the moths, all the 



legS are developed tO an equal further enlarged ; c, mid- 

 dle leg of mate. 



extent ; they only differ in pro- 

 portional lenth ; in the swallow-tails [Fig. 173] 



FIG. 174. Side view of 

 and appendages of 

 ~ioe,x5; 



