236 THE CANADIAN ENTOMOLOGIST. 



On loth August we left for Denver, taking the road up Roaring 

 Fork to Leadville. In all my rides through Colorado I was struck by 

 the absence of large trees, and do not remember having seen a tree two 

 feet in diameter in the State. We rode through miles and miles of small, 

 dead timber, probably fifty miles, killed by forest fires. 



When I left the Springs my larvae were nearly full-grown, and a few 

 had suspended for pupation. I put the three lots into three boxes with 

 fresh y-Vrtemisia for such larvae as were still feeding. I also had had 

 made a capacious tin box, and filled it with the plant. And I kept the 

 boxes by me throughout the journey to Coalburgh. When there, after 

 the Artemisia gave out, carrot and fennel were substituted, but many of 

 the larvae died in consequence. 



The imagos began to come forth at eleven and more days from 

 pupation, but many pupae hibernated, some to give imagos in April, 1895, 

 and an occasional one in May and June, while several will go over to 1896. 



The results in fall of 1894 were : 



1. From Orego?iia eggs, 3 Ore^^onia : i S , 2 $ . 



8 Bah-dii .• 7 c? , i ^ . 



2, From Baird a eggs, ist lot, 20 Bairdii : 18 c? , 2 $. 



No Oregonia, 

 From Bairdii eggs, 2nd lot, 2 Bairdii : i (^ , i 9 • 



No Oregonia. 

 The results in spring of 1895 were : 



1. From Oregonia eggs, 5 Oregonia: 3 S, 2^. 



4 Bairdii : 2 ^ , 2 9 • 



2. From Bairdii eggs, first lot, 11 Bairdii: 8 S^ 3 ?• 



I Oregonia : i ,^ . 

 From Bairdii eggs, second lot, 3 Bairdii : 2 ^ , i 9.. 



1 Oregonia .• i (^ . 

 Result in fall and spring : 



1. From Oregonia eggs, 8 Oregonia : 4 (J , 4 ?. 



12 Bairdii : 9 (? , 3 ? . 



2. From Bairdii eggs, both lots, 36 Bairdii : 29 (? , 7 $ . 



2 Oregonia : 2 ^ . 



In ail, 10 Oregonia: 6^, 4$.) 

 48 Bairdii: 38 cj, 10$. ) 



The proportion of Oregotiia to Bairdii r\ezx\y as i to 5. On 8th of 

 July, 1895, I had nineteen pupae left, which will go over a second 



