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MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



Vol. XII, 



damper climatic region, and has not been known to occur south of it, though overlapping on 

 cecropia territory. 



The black and white shades and dark rich purple hue predominate ; there are no brick-red 

 tints as in S. cecropia. The subapical ocellus is small and the discal spots smaller. As in some 

 other alpine and subarctic Lepidoptera, such as Platarctia hyperborea (parthenos) , black and 

 white and shades of madder-purple predominate. 



[Dr. James Fletcher (litt.) wrote that he had S. Columbia from Ottawa, Almonte, and 

 London in Ontario.] 



James Fletcher writes the United States Department of Agriculture from Central Experi- 

 ment Farm, Ottawa, June 24, 1898: "I may say that the food plant of Columbia [nokomis] in 

 the West is the Silver Bush, Eheagnus argentea. The experiment that I have been anxious to 



Fig. 27.— Male genitalia. 



Samia Columbia; 1 (dorsal view), 2 (ventral), 3 (lateral), 4 (posterior view). 

 7 (lateral), 8 (posterior). 



Samia cecropia; 5 (dorsal view), 6 (ventral), 



get eggs for was to see if eggs laid by the Manitoba form, which is much redder than our eastern 

 form, would feed on larch." 



Eggs of Columbia by Columbia are much smaller than eggs of Columbia 9 by cecropia s 

 (Joutel). Crosses of Columbia 9 and, cecropia 6" fed on wild cherry went through changes much 

 more rapidly than those on larch, and were a great deal larger. 



[Mr. J. Alston Moffat has published the following on S. Columbia in the Canadian Entomolo- 

 gist, 1894, pp. 281-283: 



During the winter of 1891-2, I received from Miss Morton, of Newburgh, N. Y., six cocoons of P. Columbia, which 

 she had reared from ova, received from one of her correspondents in Ann Arbor, Mich. They were the first cocoons of 

 that moth I had seen. Their extremely small size, as compared with cecropia, their natty appearance and dark color, 

 relieved by flecks of white silk, was quite novel to me, so I frequently showed them to visitors. Amongst these was 

 Mr. R. Elliot, of Plover Mills, one of our members, whose residence is about 15 miles northeast of London, and whose 

 name is well known in ornithological circles, but who is rather a "naturalist" than a "specialist"; clear, calm, and 



