( ci ) 



oriBces. Occasionally they look as if they were enlarged at 

 the distal extremity, but so far as I have been able to observe, 

 this is never actually the case ; the appearance resulting either 

 from imperfect focussing or from a twist in a fimbria which is 

 flattened rather than strictly cylindrical. These appearances 

 are specially well-marked in Hehomoia, but are also observable 

 in many other geneiu with greater or less distinctness. 



One of the most interesting of Pierine groups is the 

 genus Teracolus. This large assemblage falls naturally into 

 subordinate sections, two of which, under the names of 

 Idmais and Callosune, have occasionally been considered to be 

 worthy of generic rank. These divisions correspond to a 

 great extent with differences in the scent-distribi;ting 

 apparatus. Thus, in the Idmais group there are no 

 plumules ; T. fansta, T. 2^uellaris, and the species allied to 

 them being provided instead of plumules with specialised 

 scales of another type, collected into definite "sex-brands." 



The plume-scales of the African purple and maroon-tips, 

 T. phlegyas, T. ione, T. regina, T. hetaera, and T. ludoviciae, 

 are remarkable for the great size of the disc. In other 

 respects they resemble the Ixias type, though generally 

 smaller, and with a sharper apex. Scales with discs of very 

 much the same appearance are found in T. mananhari and 

 T. elgonensis, also in the little group of desert forms con- 

 stituted by T. halimede, T. heliocaustus and T. pleione. The 

 disc in all these is a very remarkable structure, but still more 

 curious is the form that it assumes iu T. chrysonome and 

 T. protomedia. In these species we find in place of the 

 usual rounded disc a large semi-transparent plate, generally 

 oval or shuttle-shaped, with the axis transverse to the axis of 

 the lamina, and exceeding the bi'eadth of the lamina in 

 measurement. This basal plate has a marginal thickening of 

 chitin, which in T. j^^otomedia is beaded. In both cases fine 

 chitinous lines are seen radiating from the centre of the 

 plate. The attachment of the footstalk, as in other cases, is 

 marginal. In taking specimens of these scales, the plates are 

 very apt to become detached ; and when I first examined 

 a preparation made from 1\ j^^'otoviedia, I was for awhile 

 puzzled by the numerous fusiform objects, like delicate silver 



