GENERAL CHARACTEBS 9 



you can straighten out these hmbs, and tlien the difference in 

 length to be observed between them and the other four is very 

 striking indeed. They are also thinner than the middle and hind 

 legs ; and, unlike these, are not provided with claws. 



Fig. 8.— I>ia(u;am of the Wixgs of a Butterfly. 



I. Fore wing. — 1-5, subcostal iiervules ; 6, 7, disooidal nervules ; 8-10, mediiiii 

 nervules ; 11, submedian iiervure ; 12, internal nervure ; 13-15, disco-cellular 

 nervules ; IC, interno-median nervule ; 17, median nervure ; 18, subcostal 

 nervure ; a, costal nervure ; b, costa or anterior margin ; c, apex or anterior 

 angle ; d, posterior or hind margin ; e, posterior or anal angle ; /, interior or 

 inner margin ; g, base ; h. discoidal cell. 



II. Hind wing. — 1, 2, subcostal nervules ; 3, discoidal nervule : 4-6, median 

 nervules ; 7, snbme<lian nervure : 8, precostal nervure ; 9, subcostal nervure ; l(i, 

 nietlian nervure; 11, 12, disco-cellular nervules; n. costal nervure: 6, costa or 

 anterior margin ; c, ape.K or anterior angle ; d, hind margin ; e, tail or caudal 

 appendage ; /, anal angle ; rj. alidominal or inner margin ; //, Iiase. 



These imperfectly developed legs are, of course, quite useless as 

 far as walking is concerned ; indeed, it is extremely doubtful as to 

 whether they are of any service whatever to the owner. On one 



