MEMOlliS OF THE NATIONAL ACADEMY OF SCIENCES. 



47 



Tlie Notodoutidu' of Noitli America iire in this work divided into seven subfamilies; of these 

 the Gliipltinina; I'l/gwriiia; Ichtliyurina; and Notodont'uuc oceiir both in Eurasia and Nortli America, 

 while two of the seven, the Apatelodinw and Heterocaminnw, are peculiar to North America, and 

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



Gciwrd common to Eurasia and North Aiiu 



Lo])hopteryx. 



Ghiphisia. 



Ichthyura. 



Lophodonta. 



JJrymonia. 



Plieosia. 



Notodonta. 



Nerice. (China and Nepaul.) 



Cerura. 



Apatelodes. 



Da tail a. 



Nadata. 



Ellida. 



Dasylophia. 



Symmerista. 



Genera peculiar to North America. 



Hyparpax. 

 Euhypari)ax. 

 Xylinodes. . 

 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 Paratliyris, 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 Notodontian f;xuua of Miocene and Pliocene 

 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 (jenera not occurriiuj in the Cainpeiitrian suhprorinee^ ineludiny the Pucijic Coast district 



[south of Oregon). 



■ Apatelodes. Symmerista. 



Datana (only 1 species). Hyparpax. 



Lophodonta. Xylinodes. 



Drynionia (occurs iu Colorado). Seirodonta. 



Ellida. Heterocampa. 

 Nerice. 



Dasylophia. Macrurocampa. 



Excepting three species of Schizura and Euhyparpax, the entire group of Heterocampina? 

 is wanting iu western America, and it is significant that the Heteroeampinw are entirely wanting 

 in the Old World, as is also the group Apatelodina: 



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, uoitheastern portion of North America, adding in 

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

 showing its residence in the Austroriparian subproviuce. Where a species ranges through both 

 subprovinces both numbers are inserted. 



(Except H. plumosafrom 

 Arizona.) 



