43 PLATE DXXVIL 



Several very beautiful, and rather difim6t. varieties of this line fpecies 

 occur in Auftria : that which we have delineated is the only variety, 

 however, we believe found in England, where it appears to be extremely 

 uncommon. The fpecies we apprehend to be rare on the Continent, 

 as well as in England, Fabricius referring exprefly to the cabinet of 

 Mr. Sciefferm) Her, for the example he defcribes. 



Phalaena roboraria is nearly allied to the fpecies of geometra, deno- 

 minated by Engliih collectors the " mottled beauty," (Phalaena repan- 

 daria) from which it is distinguifhed by the fuperiority of its fize, and 

 fome little variation in the form and difpofition of the fufcous lines 

 on the wings : the diffimilarity is evident on an accurate comparifon, 

 but is not fo obvious at the firft view. 



Fabricius defcribes the larva as being of a grey brown colour, with 

 a darker dorfal line, and curves on the fegments, and according alfo 

 to this writer the larva feeds on the oak, whence it obtains the 

 trivial appellation of the great oak beauty. 



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