( cvii ) 



in others they are laterally compressed and diverge distally, 

 in which case the lamina assumes a trumpet-shaped, or rather 

 perhap a goblet-shaped appearance. This is best seen in 

 EiicJiloe creusa ; it is also liable to occur in E. hellezina and 

 E. helemia. The apex is often blunt and rounded ; this is 

 especially visible in E. crei(,sa ; somewhat less so in E. jyima, 

 genutia and cardamines. The base is usually rounded, but 

 may be noticeably squared, as in E. pima. 



The scent-scales in EucJdoe eupheno are peculiar. The lamina 

 is long and narrow with a very slight bilateral compression. 

 The rounded apex is extremely blunt, and the base is tapering. 

 The fimbriae are short, about 12 in number, and seem to be 

 continued into the scale as chitinous bars ; there is no distinct 

 line of demarcation between fimbriae and lamina. The foot- 

 stalk is narrow ; the disc appears to be represented by a small 

 ladle-shaped dilatation close to the proximal end of the foot- 

 stalk, the actual termination of the latter being visible as 

 a slight projection from the disc. The conjecture may be 

 hazarded that this is a comparatively early and unspecialised 

 form of plume-scale, presenting points of resemblance to certain 

 hair-scales that occur in other Pierine groups where plume- 

 scales are not developed. Unique within the genus as at first 

 sight it appears to be, in its blunt apex, tapering base and 

 minute disc it is not greatly dissimilar from the corresponding 

 scale in E. creusa. I have indeed on one occasion obtained 

 from the latter species a long, trumpet-shaped scale which 

 came very near that of E. eupheno. It is, however, just possible 

 that this scale may not have really belonged to the specimen. 

 Why E. eupJienoides, which so closely resembles E. eupheno, 

 should be apparently devoid altogether of these structures it 

 is hard to say ; but there are several parallel instances. 



Zegris is perhaps scarcely worth separating from Eucliloe. 

 In Z. eupheme I find no scent-scales, unless certain Indian- 

 club shaped, pigmented scales, without either disc or fimbriae, 

 are to be taken as such. Z. ohjmpia has a scale of the 

 Euchloe pattern, with parallel sides, squared base and small 

 disc. The lamina is proportionately broad, and the fimbi-iae 

 are short. 



The plume-scale of the remarkable Chilian orange-tip, 



