186 THE CANADIAN ENTOMOLOGIST. 



black discal spot on primaries beneath is cut off square at the bottom, 

 where it runs along the vein. In aiisonides this spot tapers." In the two 

 species, as I believe them to be, occurring here, this character is not 

 constant either above or beneath. My specimens of creusa are 

 considerably smaller than the average of auso?tides, though larger than the 

 smallest. The mountain specimens have rather more black basal shading 

 above, but the Calgary specimen has scarcely more. But all have very 

 much heavier reticulation beneath, with more green and less yellow, and 

 are more thickly dotted above the costal margin of primaries on both 

 sides. I have ventured to doubt whether Dr. Holland's fig. 23 on Plate 

 XXXII is creusa. The reticulations show through, and look suspiciously 

 thin, the costa is perfectly clean, and I have manifest aicsonides with the 

 discal spot just as squarely cut. Dr. Skinner, however, says that the 

 figure is probably correct, and adds that creusa is so very close to 

 ausonides that their exact relationship is not known. Mrs. Nicholl 

 reported creusa to be not rare at Field during the first week in June of last 

 year, and I took a fresh specimen near timber line on a mountain 

 south-east of Windermere on July i3lh. These appear to be the first 

 records for B. C. 



73. CoHas eiis, Streck. — Mrs. Nicholl writes concerning her 1904 

 trip : '•' Elis was scattered rather sparingly over all the high mountains of 

 the main chain of the Rockies at an elevation of 6,500 to 7,500 feet. I 

 took the greatest number on the slopes of a mountain above Hector Lake 

 ( = Wapta Lake, Hector, auct.).- It also occurred at Lake Louise, Mt. 

 Assiniboine and mountains above Simpson River." I think her Lake 

 Louise record refers to a specimen she took on Mt. Piran, above Lake 

 Agnes, on July 20th, when I was with her. It was probably its first 

 appearance. Of her 1907 trip she writes: "Wilcox Pass, or rather the 

 valley just south of it, is the headquarters of C. elis, which swarms there, 

 with a few christiiia in company. It is evidently a northern insect, and is 

 the commonest Colias on the Athabasca." She kindly sent me a few of 

 the specimens, in fine condition, dated July 27th. 



74. C. eurytheme, Ed., var. eriphyle^ Edw. — ^Vhilst admitting that 

 I have made no special study of Colias, and have very little outside 

 material in the eurytheme group, and moreover, that some forms of the 

 genus are as variable and confusing as there are to be found in Euxoa 

 amongst the noctuids, nevertheless, I find it hard to accept the two forms 

 passing in the west as eriphyle ^.nd. eurytheme as being of the same specific 



