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



*Q. A. dentala, Giotc. United States. 



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



*8. yl. dLssecta, Grote. Philadelphia, New York, 

 Kansas. 



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

 Nova Scotia. 



*10. A. modica, Walk. 



*A. exilis, Grote. New Y^'ork and Texas. 



■^11. A. spini'gera, Guen. 



*A. Harveyana, Grote. New York. 



*12. A. ovata, Grote. Texas. 



*13. A. alborufa, Grote. New Y^'ork. 



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



Section Phabetba, Hiibn. 



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



2. A. ortentah's, Mann. Bitliynia. 



3. A. me}iJ/antIndis,Y\e\v. St. Petersburg, Berlin, &c. 



Section Tri^xa, Iliibn. 



1. A. pst,L,um. Regensburg &c. 

 *2. A. increta, Butl. Yokohama. 



3. A. fridens, Gmel. Frankfort &c. 



*4. A. leucocuspi's, Butl. Yokohama and N. China. 



*5. J. ^. loleJice, Guen. 



^ ? . A. thoracica, Grote. New York. 



6. A. Grotei, sp. n. 



A. lobcliffi, Grote (not Guen.). 



Half as large again as A. hhelicp^ the longitudinal black 

 streaks on the 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, (J ? 5G millini. i^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. Guende's species; but it is clear that it is not so 

 regarded in America, and therefore I name it. 



