76 Mr. A. G. Butler on Lepidoiotera of the Amazons. 



distinct to be regarded as different genera until I have to 

 re-arrange the whole of the Noctuites, and can foi'm a 

 correct estimate as to what characters are sufficient in this 

 tribe to constitute a generic distinction. 



Empelathra, Walker. 



To this genus I propose provisionally to refer Ortho- 

 gramma vaciUans =■ Plaxia ingenua and the following 

 species allied to it. 



142. Empelathra scalena. 



Thermesia 5c«Zewa,relder, Reise der Nov. Lep. iv. 

 pi. 118, fig. 13. 

 Lake Cararaucu, 17th April; Marapata, Rio Negro, 

 30th December, 1874. 



E. scalena differs from E. vacillans exactly as Plaxia 

 maculigera does from P. macarea. 



143. Empelathra amplificans. 



Emjyelathra amplificans, Walker, Lep. Het. xv. 

 p. 1633, n. 1 (1858). 

 Paricatuba, 17th October, 1874. 



This is a rare species in which the apex of primaries is 

 obliquely truncated, the costal margin is shorter than in 

 the other two species which I have refeiTed to the genus. 



