ADVERTISEMENT. 



in the same manner, and have reared larvae without end. In this way, many cases 

 of polymorphism have been estabhshed, and the position of many doubtful forms 

 settled. A light has also been thrown on the limits of variation in species. In 

 every case, I have preserved descriptions of the several stages, and many of them 

 have been published. Of a large proportion, also, Mr.s. Peart has executed colored 

 drawings, magnified wlien necessary, and my albums contain nearly one thousand 

 figures. 



In 1868, Coalburgh was inaccessible from the East, except by stage-road across 

 the Virginian Alleghanies, and the journey to Philadelphia was a matter of four 

 days; therefore it was next to impossible to get larva> to the artist. Had that state 

 of things continued, very few larval drawings could have been given in Vol. II. 

 But the opening of the Chesapeake & Ohio Railroad, in 1870, changed all that. 

 Now, every part of North America which can be reached by railway — Florida, 

 Arizona, Southern California, and even Vancouver's Island and British Columbia — 

 is tributary to these Volumes. 



And so, in this Christmas time of 1886, I commend Vol. III. to the good 

 will of the friends who have made my small audience for so many years. 



WM. H. EDWARDS. 

 Coalburgh, W. Va., December 25, 1886. 



