122 The Ottawa Naturalist. [Oct. 



feet altitude, Nos. 34,822, 34,823; abundant at 5,000 feet 

 altitude on one mountain near the second summit west of Skagit 

 River, B.C., No. 69,949. Not seen elsewhere in the Skagit 

 Valley. (/. M. Macoun.) 



Spir^a Douglasii, Hook. 



Abundant at Chilliwack, B.C., No. 34,819, and Sumas Lake, 

 B.C., No. 34,820. (/. M. Macoun.) Not before recorded from 

 the B. C. mainland. 



Petasites dentata, Blankinship, Mon. Agr. Coll. Sci. Stu. I: 64. 

 P. sagittata, Macoun, Cat. Can. PI. I: 260 in part. 

 Long separated from P. sagittata in our herbarium but with- 

 out a name. The shape of the leaf is intermediate between those 

 of P. palmata and P. sagittata. Pursh described the radical 

 leaves of P. sagittata as being "oblongis acutis sagittatis in- 

 tegerimus, lobis obtusis." The specimens he saw were from 

 Hudson Bay. Gray in order to include western specimens 

 changed the description of the leaves to "deltoid-oblong to 

 reniform-hastate, from acute to rounded-obtuse, repand- 

 dentate." A common species throughout the prairie region 

 extending west at least to the Rocky Mountains. In British 

 Columbia it is replaced by P. speciosa. Dr. Greene, {Leaflets 

 p. 180), described a plant collected by Prof. Macoun at Emerson, 

 Man., in 1880, (Herb. No. 72375), calling it P. vitijolia. The 

 configuration of the leaf is quite unlike that of any of the speci- 

 mens referred to P. dentata. 



Vernonia corymbosa, Schweinitz. 



Damp prairies, near Morris, Man., Aug. 8th, 1906, No. 

 23,104. {John Macoun.) Not before recorded from Canada. 

 Vernonias are abundant in southwestern Ontario and from that 

 region we have specimens which have been referred to V. gigantea, 

 V. fasictdata and V. Drumniondii and what appear to be typical 

 plants of all three are in our herbarium, but other specimens 

 cannot certainly be determined so that they cannot yet be 

 recorded. 



DISCOURSES UPON THE LEPIDOPTERA. 

 I. VARIATION. 



By. F H. Wolley-Dod, Millarville, Alta. 



In Europe, more particularly in the British Isles, species of 

 lepidoptera are less frequently confused, and variation far better 

 understood, than on the North American continent. Many of 



