740 A N INTROD UCTION TO ENTOMOLOG Y 



Family PAPILIONID^ 



The Swallow-tails and the Parnassians 



This family includes the swallow-tail butterflies, which are common 



throughout our country, 

 and the parnassians, 

 which are found only on 

 high mountains or far 

 north. These insects are 

 distinguished from all 

 other butterflies found in 

 our fauna by the fact 

 that vein M2 of the fore 

 wings appears to be a 

 branch of cubitus, mak- 

 ing this vein appear to be 

 four-branched, and by 

 the fact that the anal 

 area of the hind wings is 

 more reduced than the 

 anal area of the fore wings, 

 the former containing 

 only a single anal vein, 

 the latter two in the 

 parnassians and three in 

 the swallow-tails. 



This family includes 

 two well-marked sub- 

 families, which are dis- 

 tinguished as follows. 



A. The outer margins of the 

 hind wings usually with one 

 or more tail-like prolonga- 

 tions; ground color of 

 wings black or yellow; the 

 base of the first anal vein 

 preserved as a spur-like 

 branch of vein Cu (Fig. 

 945) ; radius of the fore 

 wings five-branched, p. 740 



Papilionin/E 



AA. The outer margin of the hind wings rounded, without a tail-like prolonga- 

 tion; ground color of wings white; radius of fore wings four-branched; the 

 first anal vein wanting (Fig. 951). p. 744 Parnasshn^ 



Subfamily PAPILIONIN^ 



The Swallow-tails 



These magnificent butterflies are easily recognized by their large 

 size and usually by their tail-like prolongations of the hind wings. 



Fig. 945. — Wings of Papilio polyxenes. 



