400 Mr. A. G. Butler on the Genus Acronycta. 



*Q. A. dentata, Grote. United States. 



*7. A. increta, Grote. New York. 



*8. ^. dissecta, Grote. Philadelphia, New York, 

 Kansas. 



*9. A. darescens, Guen. Trenton Falls, New York, 

 Nova Scotia. 



*10. A. modica, Walk. 



*A. exilis, Grote. New York and Texas. 



■^11. A. spimgera, Guen. 



*A. Harveyana, Grote. New York. 



*12. A. ovata, Grote. Texas. 



*13. A. alborufa, Grote. New York. 



*14. A. grisea^ Walk. Hudson's Bay. 



Section Phaeetra, Hiibn. 



1. A. auricomaj SchifF. Zurich, Livonia, &c. 



2. A. orientalis, Mann. Bithynia. 



3. A. menT/anthidi'SfYiew. St. Petersburg, Berlin, &c. 



Section Tri^na, Hiibn. 



1. A. psijJjinn. Kegensburg &c. 

 *2. A. increta, Butl. Yokohama. 



3. A. tridens, Grael. Frankfort &c. 



*4. A. leucocuspis, Butl. Yokohama and N. China. 



*5. cJ. ^. lobelice, Guen. 



■^ $ . A. thoracica, Grote. New York. 



6. A. Grotei, sp. n. 



A. lobelige, Grote (not Guen.). 



Half as large again as A. hhelice, the longitudinal black 

 streaks on tlie primaries slightly more elongated, but all the 

 markings very similar : secondaries decidedly darker, with 

 more golden gloss, the grey markings also darker. Expanse 

 of wings, ^ S^ bi^ millim. (^one dwarfed male 47 millim.). 



New York and Kansas. 



It is possible that this may be no more than a large dark 

 form of M. Guen^e's species; but it is clear that it is not so 

 regarded in America, and therefore I name it. 



