230 THE CANADIAN ENTOMOLOGIST. 



often make a revision of those parts of the library which are little or 

 rarely used. The Public Library does not seem in danger, but I know 

 the surroundings only imperfectly. , After all these gloomy predictions, I 

 may assert that nobody would be happier than I if they were forever un- 

 founded, and the librarian might say. What's Hecuba to him, or he to 

 Hecuba ! 



ON THE GEOGRAPHICAL DISTRIBUTION OF NORTH 

 AMERICAN LEPIDOPTERA. 



BY AUG. R. GROTE, A. M. 

 (Concluded.) 



The following tables contain a partial resume of the species common 

 to Europe and North America, and also of what are technically known as 

 representative species. I have intended to include only species which I 

 have myself examined and which are with some certainty accurately com- 

 pared. But the term " representative " species is in itself perfectly elastic, 

 as I have elsewhere shown ; in the present case the species compared are 

 believed to have had a common ancestor in the Tertiary. With regard to 

 the introduced species no historical data are accessible to me, and I doubt 

 if any exist ; it is a case for the operation of reasonable surmise. I think 

 these tables are of preliminary interest and value ; I first commenced to 

 publish similar observations in the Bulletin of the Buffalo Society of 

 Natural Sciences. In a comparison of European and American species 

 we are chiefly indebted to M. Guenee and Dr. Speyer. 



FIRST CATEGORY OF ORIGIN OF THE NORTH AMERICAN FAUNA. 



/. Species of Moths Common to North America and Europe, probably 

 7iot Introduced by Commerce, and thus Unchanged Descendants 

 of a Tertiary Fauna. 



Europe. N. America. 



Euprepia caja (^Linn.) Grote, Check List, p. 15. 



Agrotis C-nigrum {Linn.) Guenee, Noct. I., 328. 



plecta {Lin?i.) Guenel, Noct. I., 326. 



fennica {Tausch.) Guefiee, Noct. I., 270. 



