118 THE Ottawa NATURALIST. | September 
within my cyanide bottle, and naturally I was rather excited when 
I saw that it was Sthenopis thule, the first specimen which had 
ever been taken in the Ottawa district. 
The specimen, a female, was in perfect condition, and had 
evidently only emerged from the pupa a short time previously. 
In colour it was a beautiful primrose yellow, the reddish brown 
along the costa and the spots of the same colour on the primaries, 
being well defined. With the wings expanded it measures 3% 
inches. The time of capture, viz., 11.35 p.m., seems rather un- 
usual. In an article on the occurrence of the species at Montreal,* 
Mr. H. H. Lyman says: 
‘* The species seems to fly only for about fifteen to twenty 
minutes in the twilight, as I have never taken it before ten min- 
utes past eight, nor ever after half past eight.” 
Since capture, the wings of the above mentioned specimen 
have lost some of the bright yellow colour ; but this, Mr. Lyman 
tells us, is peculiar to the species, as, in the cabinet, specimens 
soon fade and lose their original yellow colour. 
The following evening, the 7th July, I again had the good 
fortune to observe the species. At this time it was along the 
road at the northern end of Dow’s Lake, but a short distance 
from where the first specimen was seen. About 8.30 p.m. I was 
walking along this road to the Farm to meet Dr. Fletcher, when 
I saw a male specimen of ¢hule flying rapidly up-and down, near 
a tall cedar tree, in the peculiar oscillating manner of the species. 
I watched it flying thus for several minutes, when suddenly a — 
female flew along and settled near the end of a twig of the same 
tree. The male immediately flew around her, and in a very short 
time copulation took place. I observed them further for some 
little time, and thought by giving the tree a sudden jar that they 
would fall and I could capture them. The jarring, of course, 
disturbed them; but, as it was getting dark, I failed to see whether 
they fell to the ground or flew away. 
Search was made for further specimens on following even- 
ings, by both Dr. Fletcher and the writer, but without results. 
*Canadian Entomologist, vol. xxv, Dec. 1893. 
