( cxx ) 



which comes nearest to the form just mentioned is apparently 

 Fiei'is josepha. I have been unable to examine the scent-scales 

 of the latter insect, as the specimens at my command are all 

 females. A form of Pieris, also undescribed, brought by Dr. 

 G. B. Longstaft" from Venezuela, belongs to the present section. 

 Like P. huniae and others, it has conspicuous mealy streaks, 

 well-developed on the forewing, and less extensive on the hind- 

 wing. 



Pieris plvileta, otherwise P. monuste, shows by its scent- 

 scales no resemblance whatever to the last-mentioned section. 

 On the other hand, its affinity with the first section of the 

 genus, as already stated, appears to be very close. The plume- 

 scale, but for its larger size, might almost be taken for that 

 of P. tithoreides or P. demophile. 



We now come to a group of neotropical species, which on 

 account of their similar venation were ranked by Mr. Butler 

 along with the African species agatliina, chloris, etc., in the 

 genus Mylothris. As already mentioned, I had for a long 

 time suspected that the evidence of the venation was in this 

 instance deceptive, and that there was no close affinity between 

 ^^ Mylothris ^^ fyrrha, malenka, etc., and the old-world forms 

 with which they had been associated. Mr. Trimen had ex- 

 pressed a similar opinion, though I was not aware of this at 

 the time. From these considerations, the examination of the 

 scent-scales became especially interesting. Their testimony 

 was clear ; the scent-scales of the neotropical species men- 

 tioned belong to an entirely different type from that of the 

 African genus Mylothris. On the other hand, they are by no 

 means unlike the corresponding structures in what I have 

 called the first section of Pieris, and in one or two points show 

 a resemblance to Catastiota. If we depended on the evidence 

 of the scent-scales alone, we should unhesitatingly vaxik 2'>yrrha 

 and its associated species with Pieris locusta, mandela, apicalis 

 and demophile. 



The plume-scales in M. pyrrha itself are rather scanty. The 

 lamina is somewhat exceptional in being lance-headed, the 

 sides showing a regular curve instead of an angle. The con- 

 dition is a little like that seen in Catasticta hegenion and G. 

 colla, but the scale is not nearly so broad as in those species. 



