THE CANADIAN ENTOMOLOGIST. 129 



Fauna, published the same year, includes only forty-six species, including 

 certainly by error the assumed European species, Hesperia Mtna Bdv. 

 Meanwhile, to restore due proportion, there should be deducted from the 

 number given by Kirby, the varieties which he admitted as distinct species 

 and those which he mentions under more than one name. The number 

 of such seems to be quite considerable, if I may judge from those known 

 to me, of those which I do not know. Nevertheless, I suppose it will 

 not amount to more than one-tenth of the whole, so that, by accepting 

 the round number one thousand, and placing to account the discoveries 

 of the last six years, this number may perhaps be regarded as too low 

 rather than as too high. Hence the proportion (46 : 1000) of the number 

 of our Hesperians to the total number known, would be about as one to 

 twenty-two. Europe, strictly, has only twenty-eight species, and it is hardly 

 probable that this number will be increased by new additions. 



The Fauna of North America claims particular interest because of its 

 many close relationships to ours, and the impossibility of separating its 

 Arctic products from those of the Eastern hemisphere. .Edwards' later 

 Catalogue enumerates, as before stated, one hundred and eleven Hes- 

 perians as inhabitants of the Extra-tropical parts of North America, 

 including Sylvanus and Tages, but excluding a number of Scudder's species 

 which Edwards regards as varieties. North America is thus far more than 

 twice as rich in species as our Faunal-region ; but still, in proportion to 

 her vast territory, is poor in comparison with the tropical parts of the 

 earth, and above all if compared with South America, where not only the 

 Hesperian Fauna, but the Diurnals especially, have developed in their 

 greatest abundance. 



The genera common to both the American and European Faunas are 

 Carterocephalus, Thymelicus (from both of these I have as yet seen no 

 American species), Pamphila, Pyrgus, Scelothrix and Nisoniades ; the ten 

 other genera adopted by Edwards have no representatives in our Faunal- 

 region. North America is poorer than Europe in species of the genera 

 Pyrgus and Scelothrix, but as an offset to that, it is far richer in species of 

 Pamphila and Nisoniades, especially of the former, of which Edwards 

 mentions fifty-eight. The southern portions of the Union are populated 

 by tropical forms, of which certain representatives {Eudamus Tityrus Fab. 

 andii. Pylades Scudd.) extend to New York and farther north. 



(To be Continued in Following Number. ) 



