THE CANADIAN ENTOMOLOGIST. 39 



Male. — Expands 28-31 mm. Upper side of primaries bright silvery- 

 blue, with heavy black marginal border. No discal spot. Secondaries 

 bright silvery-blue, with very narrow black marginal border. There is a 

 row of five black dots separated from ground colour by heavy red crescents 

 extending along the marginal border. The general colour of under side is 

 a^h gray, flushed with bluish scales. The markings are the same as acmon, 

 only much heavier and more distinct. All wings fringed with white. 



Female. — Expanse 30-35 mm. Upper side of primaries bright blue, 

 with black discal bar. The outer half of wing is taken up with a broad 

 black band, which fades into ground colour towards base. Secondaries 

 same as male, only red crescents are twice as wide, occupying nearly one- 

 third of the wing. Ground colour of under side brownish-gray, markings 

 very heavy and pronounced, as with the male. 



The females appear to vary considerably. Some have the red 

 crescents continued on primaries. Another specimen in my series has a 

 marginal row of white spots on primaries. I have never come across these 

 variations among true acmon, though I have examined hundreds of 

 specimens from different localities. 



A comparative table of R. acmon and R. monticola reads as follows : 



Male. 



R. monticola. 

 Expanse, 28-31 mm. 



R. acmon. 

 Expanse, 25-27 mm. 

 Ground colour violet-blue. 

 Marginal band primaries narrow 

 Red crescents on sec. indistinct. 



Ground colour silvery-blue. 

 Marginal band primaries broad. 

 Red crescents on sec. very pro- 

 nounced. 

 Markings on under side very heavy. 



Markings on under side distinct. 



Female. 

 Expanse, 21-26 mm. Expanse, 30-35 mm. 



Ground colour dark brown. Ground colour silvery-blue. 



Oiher differences same as in the male. 



The Annual Rfport of the Society 10 ihe Legislature of Ontario is 

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