( cxv ) 



being the largest. Its form varies somewhat according to the 

 species. The footstalk is uniformly narrow. 



Leodonta, which resembles Pereute in neuration, presents us 

 with scent-scales of a similar type to those of that genus. The 

 laminae are, however, shorter, and also broader in proportion. 

 The base is cornuated, but the basal processes are generally 

 less elongated than in the preceding genus. The base is 

 usually asymmetrical, as in Pereute calUnira. This is least 

 marked in L. zenohia, but even in this species one cornu 

 tends to be blunt and the other sharp. The footstalk in 

 Leodonta is thin and the disc moderate in size ; both of which 

 features are also characteristic of Pereute. 



Still keeping to the Neotropical Eegion, we come next ti) 

 the extensive genus Catasticta. Here again, together with 

 specific differences, we meet with considerable family re- 

 semblance. The lamina in C. corcyra, C. jneridoides and 

 0. toed resembles that of Leodonta in having the base more 

 or less asymmetrically cornuated. In the two former species 

 the likeness to Leodonta zenohia is increased by the slight 

 convexity of the laminal sides. The genus is characterised 

 throughout by the comparative thickness of the footstalk ; 

 this is a point of distinction from both Leodonta and Pereute. 

 Another characteristic feature, frequent though not universal, 

 is the extreme breadth of the lamina as compared with its 

 length. Among the species known to me, this is best seen in 

 Catasticta Jlisa and C. bithi/s ; it is also marked in C. hryson 

 and C. hpgemon. The lamina in the latter is peculiar. In 

 shape it is like a very broad arrow-head, the barbs being 

 represented by short, blunt cornua. The sides are sti-ongly 

 convex, almost angular ; the fimbriae, long and straight, are 

 set on about the distal two-thirds of the nearly straight line 

 which runs from the point of greatest convexity up to the 

 apex. There is no angle, such as exists in nearly every other 

 kind of plume-scale, marking the point at which the fimbriae 

 begin. The lamina in C. colla is somewhat similar, but less 

 broad and more regularly cordate. In most of the species of 

 Catasticta the base is right-angled ; it is often slightly bilobed ; 

 seldom rounded off, though this occurs in Catadida theresa, 

 C. ivanco, and one or two others. The sides are nearly alway.s 



