MEMOIES OF THE NATIONAL ACADEMY OF SCIENCES. 



47 



The NotodontidtB of North America are iu this work divided into seven subfamilies; of these 

 the Gltiphisiuo', rygcvrincc, Ichthyitrhuv, and Xotodont'ma' occur both in Eurasia and North America, 

 while two of the seven, the Apatelodincv and Eeterocampimv^ are peculiar to North America, and 

 extend through Central into the eastern forest-clad tropical region of South America. 



Lophopteryx. 



Gluphisia. 



Ichthj'ura. 



Lophodouta. 



Drymonia. 



Genera common to Eurasia and North America. 



Pheosia. 



Notodonta. 



Nerice. '(China and Nepaul.) 



Cerura. 



Apatelodes. 



Datana. 



Nadata. 



Ellida. 



Dasylophia. 



Symmerista. 



Genera peculiar to North America. 



Hypai'pax. 



Euhyparpax. 



Xyhnodes. 



Schizura. 



Seirodonta. 



Heterocampa. 



Macrurocampa. 



Of this assemblage several genera extend into Central and South America (the Brazilian 

 subregion), and, besides those enumerated, Nadata, Hyparpax, and Schizura will perhaps eventu- 

 ally be found to exist in the Brazilian subregions. I have included Apatelodes, as it is so closely 

 allied to Tarathyris, and may be found to be identical with it. Cerura is of doubtful occurrence 



in South America. 



Genera common to North and South America. 

 Apatelodes. Heterocampa. 



Dasylophia. Macrurocampa. 



Symmerista. 

 It appears from these facts that our Notodontians have originated iu North America, the 

 species of those genera ranging into tropical South America having perhaps migrated from the 

 northward, and their ancestors may have formed the Notodontiau fauna of Miocene and Pliocen e 



North America. 



Within the limits of the United States there are profound differences in the Arid Plateau 

 province and the humid or eastern province. 



American genera not occurring in the Campestrian suhprovince, including the Pacific Coast district 



{south of Oregon). 



Apatelodes. Symmerista. 



Datana (only 1 species). Hyparpax. 



Lophodouta. Xylinodes. 



Drymonia (occurs iu Colorado). Seirodonta. 



j;]lj^j.^_ Heterocampa. (Except H.plumosa from 



Nerice'. Arizona.) 



Dasylophia. ' Macrurocampa. 



Excepting three species of Schizura and Euhyparpax, the entire group of HeterocampiniB 

 is wanting in western America, and it is siguiftcant that the Heterocampinw are entirely wanting 

 in the Old World, as is also the group Apatclodinw. 



Now, confining our attention to the United States and British America, we will give a tabular 

 view of the species of the forest-clad, humid, northeastern portion of North America, adding in 

 a parenthesis after the name of each species either (1) for the Appalachian subprovince or (2) 

 showing its residence in the Austroripariau subprovince. Where a species ranges through both 

 subprovinces both numbers are inserted. 



