136 PIE11ID.E. 



never be a true indication of the actual line of descent. The 

 following key to the genera of the Pieridce is therefore purely 

 artificial. 



Key to tlie Genera of the Pieridae. 



A. Fore wing: vein 8 absent. 



a. Fore wing : vein 9 absent. 



'. Fore wing : vein 10 emitted from subcostal 



vein L,EPTosiA,p.l37. 



b'. Fore wing : vein 10 emitted from vein 7 DELIAS, p. 139. 



b. Fore wing : vein 9 present in tf and with one 



exception in 5 also. [p. 150. 



a'. Fore wing : costa serrated PRIONERIS, 



b'. Fore wing : costa not serrated. 



' 2 . Fore wing : vein 11 anastomosed with [p. 155. 



vein 12 ANAPHJEIS, 



b 2 . Fore wing : vein 11 not anastomosed with 



vein 12. 

 3 . Fore wing : vein 5 emitted from vein 7, 



only one discocellular present BALTIA, p. 158. 



ft 3 . Fore wing : vein 5 emitted from cell. 

 a*. Fore wing : vein 6 emitted from vein 7. 

 a 5 . Fore wing : vein 10 emitted from 



subcostal vein. 



G . Hind wing : precostal vein pre- 

 sent. 



n 7 . Hind wing : termen rounded, 

 not angulated at apex of 

 vein 4. 

 s . Fore wing: vein 6 emitted ' 



from about middle of vein 7. APORIA, p. 160. 

 ^". Fore wing : vein 6 emitted 

 from vein 7 closer to its base 

 than to its apex, 

 9 . Fore wing : vein 1 1 emitted 

 from subcostal vein closer 

 to its apex than to its base. 

 rt 10 . Fore wing : vein 9 emit- 

 ted from vein 7 very 

 close to its apex, some- 

 times absent PIERIS, p. 167. 



fe 10 . Fore wing : vein 9 emit- 

 ted from vein 7 further 

 from its apex and always 

 present. 



a 11 , c? without specialized 

 tufts of stiff haii-s on 

 anal segment. 

 12 . Fore wing: apex 



not falcate. 



a 13 . Fore wing: bases 

 of veins 6 and 10 

 equidistant from 

 apex of cell. Hind 



wing: lower disco- [p. 181. 



cellular straight . HUPHINA, 



