218 



must necessarily have emigrated from their original birth-place, 

 every fact of distribution becomes a link in the chain of evi- 

 dence of the successive migrations and changes of the species. 



An examination of the literature of the subject shows that 

 the past ten or fifteen years have furnished the greater part of 

 the data for tracing the geographical distribution of our Cole- 

 optera ; and it is only within five or six years that many ex- 

 tensive local lists have been published, based on careful collect- 

 ing for a considerable time. I have made out a list of papers 

 containing facts bearing on the distribution of the Coleoptera 

 of boreal America, pubhshed during the last eleven years. My 

 list includes nearly every paper on Coleoptera published during 

 this period, because nearly every paper gives the localities of 

 one or more species, and as the number of such papers is very 

 great, it will of course be impossible for me to notice each one 

 separately. They may be grouped as follows : 



1°. Independent descriptions of new species. 



2°. Monographs or analytical tables of species. 



3°. Lists of species collected in particular regions. 



Many of the papers published are of a mixed nature, but a 

 few of the more important ones, belonging substantially to the 

 third group, are as follows : 



Dr. Horn (Trans. Amer. Entom. Soc, 1868, v. 2, p. 123- 

 128) gives a list of 180 species from southwestern Virginia. 



J. Pettit (Can. Entom., 1869, v. 1, p. 106-107, v. 2, p. 7, 

 17-18; 1870, v. 2, p. 53-54, 65-66, 84-86, 102-103, 117- 

 118, 131-133, 151 ; 1871, v. 3, p. 105-107 ; 1872, v. 4, p. 

 12-14) gives a list of 1143 species, of which 383 are indicated 

 as new to the Canadian fauna. In Can. Entom., 1872, v. 4, 

 p. 98-99, he adds 65 species. 



Dr. LeConte (Annals and Mag. Nat. Hist., 1869, s. 4, v. 4, 

 p. 369-385) gives a list of 188 species collected in Vancouver's 

 Island, with remarks on the wide distribution of some of the 

 species ; 17 species were not before known to occur so far west 

 and 14 others not so far north. 



S. V. Summers (Can. Entom., 1873, v. 5, p. 132-134,145- 

 147, 168-170, 190-192 ; 1874, v. 6, p. 52-55) enumerates, to 

 the end of the Colydiidae, 595 species from St. Louis co.. Mo. 



