( ^v ) 



the base is still more expanded, and ends in curved later;i,l 

 processes or coinua, which are more strongly marked in the 

 Western than in the Southern forms, reaching in a specimen 

 from Ashanti a development which approaches that of the 

 next species, L. pharis. This last-named butterfly, noteworthy 

 for its superficial resemblance to Nychitona medusa, possesses 

 a highly remarkable scent-scale. The lamina is very long, 

 very narrow, and exhibits a greatly expanded and strongly 

 cornuated base, which may be called " half-moon shaped." A 

 collection of these scales examined with a low power reminds 

 one forcibly of a cuneiform inscription thrown into confusion 

 — a kind of " printer's pie." 



But perhaps the strangest form of scent-scale to be found 

 in this genus is that of L. huquetii, which is very large, of 

 nearly uniform breadth, but slightly narrower towards the 

 greatly blunted apex. The basal corners are slightly rounded, 

 but the whole aspect of the lamina is quadrangular. The 

 chitinous ribbing is very pronounced ; a slightly altered 

 arrangement along the central axis produces the effect of a 

 core for about the basal two-thirds of the scale. The fimbriae 

 are unusually short. In all these species of Leuceronia the 

 disc is large ; extremely so in L. buqitefii, least so in 

 L. thalassina. In L. argia, and to a less extent in L. pharis, 

 some of the ordinary scales have sharp basal prolongations, 

 giving them, with the footstalk, a three- pronged appearance. 

 It is observable that, as probably would have been guessed 

 from their general appearance, the species of the last two 

 groups that come nearest to each other in respect of their 

 scent-scales are Xepheroiiia avatar on the one hand, and 

 Leuceronia thalassina on the other. L. buquetii seems to be 

 the most divergent. 



The two species of Eroiiia proper, viz. E. cleodora and 

 E. leda, present a different kind of plume-scale from the 

 preceding. In E. cleodora the lamina varies somewhat in 

 breadth, but is always U-shaped, with parallel sides and 

 rounded base. The fimbriae are rather short and tend to be 

 wavy ; they may apparently be bifid, and may anastomose. 

 In Eronia leda the lamina narrows gradually from base to 

 apex; the base is provided with lateral cornua more or less 



