( cxxxiv ) 



narrow and straight-sided, showing no sign of spatulation. 

 In every species of Ganoris known to me, but especially in 

 G. brassicae, the scent-scales are abundant. 



The plumule of Ganoris crucivora is much like that of G. 

 rapae ; those of G. oleracea, G. melete and G. ajaka are more of 

 the 7iapi type. G. oleracea is remarkable in having the cornua 

 ending in sharp spines, which give a perfectly distinctive 

 appearance to the plumule of that species. A certain approach 

 to this condition is seen in G. ajaka, where many of the 

 plumules have a rudimentary spine on one or bobh cornua. 

 Forms included under the name of G. melete have scent-scales 

 showing differences which may be specific. One such form 

 lias accessory discs which are enormously large in pi'oportion 

 to the laminae. 



With respect to their scent-scales, the members of the genus 

 Synchloe show a strong resemblance to many forms of Euchloe. 

 The laminae, for instance, in *S'. cJdoridice are strikingly like 

 those of Etichloe creusa, exhibiting a similar expansion towards 

 the blunted distal margin. The discs in both genera are 

 small, and circular or oval. Synchloe hellica and S. johnstonii 

 have plume-scales of the like character, while those of S. 

 glauconome differ chiefly by the sharpness of thsir apex. The 

 laminae in S. dapUdice vary considerably in breadth ; they 

 bear much resemblance to those of E. ausonia and E. belemia, 

 having like them a somewhat short apex. In both genera, 

 Euchloe and Synchloe^ the laminae are characterised by a well- 

 marked longitudinal ribbing, which is in obvious relation with 

 the fimbriae. 



The genera Balt'ia and Phulia appear to be devoid of plume- 

 scales. Their ordinary scales are peculiar, being unusually 

 short and broad; in which respect they are in some degree 

 resembled by those of the genus Tatochila. 



The scent-scales of this latter genus are not altogether dis- 

 similar from those of Synchloe, though generally very much 

 larger. They show interesting specific differences ; the lamina, 

 which is basally squared in T. stigmadice and rounded in T. 

 xanthodice, being shaped like the blade of a mason's trowel in 

 T. theodice, and having convex sides in 7\ autodiee. 



In Pontia soracta the plume-scales, which ai'e very numerous. 



