APORIA. 139 



"Genera of Diurnal Lepidoptera," in 1847. In 1870 Dr. A. 

 G. Butler published a revision of the family in the "Cistula 

 Entomologica," in which he enumerated forty-eight genera, 

 primarily classified according to the number of branches of the 

 sub-costal nervure ; and in 1886 Schatz again revised the Family, 

 not admitting all Butler's genera, but including Pseudopontia, 

 Plotz, which is certainly a Moth. Schatz divides the Pieridce, 

 into four families, which appear on the whole to be natural, 

 and which will therefore in the main be adopted in the present 

 work. 



Schatz, however, places his four groups in the following 

 order : Dismorphidce^ Pieridce^ Dryadce, and Charidce. I 

 have re-arranged these divisions as Sub-families, in what 

 appears to me to be a more natural' sequence : Pieri?ice, JDis- 

 morpliince> Anthocharince, and Callidryince. 



SUB-FAMILY I. PIERIN^E. 



Antennae generally with a well-marked club. Palpi gene- 

 rally extending beyond the head, and clothed with long stiff 

 hairs in front. Terminal joint pointed, as long as or longer 

 than the middle joint, rarely smaller. Pre-costal nervure always 

 distinctly present. Sub-costal nervure generally with three or 

 four branches. 



This is the typical group of the Pierida. The species are 

 generally of a white colour, and the hind-wings are rounded, 

 more or less dentated only in one or two genera allied to 

 Pereute. The sections of the old genus Pieris are mostly 

 treated as sub-genera by Schatz, but the more important of 

 these will be here enumerated as separate genera. 



GENUS APORIA. 



Aporia, Hiibner, Verz. bek. Schmett. p. 90 (1816); Schatz, 

 Exot. Schmett. ii. p. 60 (1886). 



