70 Distribution of Moths of the Sub-family Bistonince. 



Amraica recur saria (Walker). North India. 



Amraica super ans (Butler). Japan and China. 



The genus Eubyjodonta (Warren). 



Eubyjodonta emarginata (Leech). Western China. 



Eubyjodonta quercii (Obthr.). Western China. 



Eubyjodonta clorinda (Obthr.). Western China. 



Eubyjodonta erilda (Obthr.). Western China. 



On account of the obvious relationship between Eubyjodonta 

 and the more primitive members of Buzura, for the sake of 

 convenience, the two are taken together. 



It would, however, be erroneous to assume that the main 

 genus Buzura is a homogeneous whole ; far from it, as com- 

 parison of its components, and the necessary division into 

 subgenera upon structural characters drawn from the macro — 

 and microscopical examination of the various antennal 

 structures, proclaim. 



In coming to any conclusion as to which of these are 

 original, and which derived forms, we may proceed in different 

 ways, one necessitating a study of the distribution and the 

 other based on structure. We shall adopt the latter course 

 and then see if it harmonises with the geographical distribution. 



As may be perceived from our tabulation of the species 

 given above, the types of antennae exhibited by the genus are 

 graded ; first we have a group, the Buzurce proper, displaying 

 normal bipectinated antennae ; then follow the BlepharoctenicB 

 with the antennae subpectinated or even serrate and, lastly, the 

 unipectinated Amraica fraternity. Now, without exception, 

 all of the genera already reviewed, whether primitive or highly 

 specialised, possess definitely bipectinated antennae and the 

 older the form, the more conspicuous the pectinations. Con- 

 sequently, we must conclude that, in the subgenus Buztira, 

 we have the modern representative of the original break from 

 the Northern Amphidasyd line, and from it, necessarily the 

 other two have arisen. 



And this feature is exactly where Buzura comes in line with 

 Eubyjodonta ; if w"e lose sight of the scalloped margins of the 

 latter genus there is but little indeed remaining to separate 

 them. Plainly, therefore, these two are basal branches from 

 the same main stem, and their centres of dispersal are to be 

 placed in localities, if not exactly the same, then contiguous. 

 But they occur cheek by jowl in Western China, M'^hence we 

 gather that not far from this region both set out on their 

 wanderings. 



Once again we ha"\'e brought before us definite evidence that 

 the Amphidasyds, as well as the Bistonince, originated as a 

 whole in Eastern Asia. Still this difference is manifested that 

 the majority of the Amphidasyd genera show distinct inclina- 

 tions for warmer climates and are built accordingly ; they. 



Naturalist 



