THE CANADIAN ENTOMOLOGIST 407 



ference between these varieties, as all the figures are from the 

 types except those for var. ceqiiahile, which are from material in 

 the Cornell collection and those of var. yakima, which are drawn 

 from material collected by the writer in the type locality. All of 

 these varieties undoubtedly intergrade because intergradations 

 were found between var. yakima and var. californicum, and in a 

 letter to Mr. Williamson, Dr. E. M. Walker states that such in- 

 tergradations exist between var. cequabile and var. hudsonicum. 

 The figures show that the five varieties can be grouped into two 

 groups by the extent of colour on the male fore wing. Varieties 

 cequabile, coloradicum and hudsonicum have the black of the front 

 wing covering half the distance or less from the nodus to the tip. 

 These are species of the eastern United States. Varieties yakima 

 and californicum have the black of the front wings extending over 

 more than half the space between the wing tip and the nodus. 

 These are Pacific Coast forms. 



Because of the plate, keys are unnecessary, and further notes 

 are given under each variety heading. 



Agrion aequabile aequabile (Say). 



Jour. Acad. Phila., 8, p. 33, 1839. (Calopteryx) . 



cf and 9 types in the Mus. Bost. Soc. Nat. Hist. 



The writer has not seen these types so the authority for their 

 location is Muttkowski's Catalogue. This is the widely dis- 

 tributed eastern form that ranges across the northern states from 

 Maine to Iowa. Probably it will be found even farther west in the 

 Missouri River Valley. It has the least colour in its wings of any 

 of the varieties excepting possibly coloradicum. It is found in all 

 collections. 



Agrion aequabile coloradicum Cockerell. 



Psyche, 20, p. 173, 1913. 



cf type in the U. S. Nat. Mus. 



The figures are drawn from the type. The female is unknown. 

 This variety is from the high mountains of Colorado and differs 

 from cequabile in having slightly more colour in the wings. It is 

 the least distinct of the series of varieties. In the U. S. Nat. Mus. 

 collection is a specimen from Ft. Collins, Colorado, identified by 

 Dr. Banks as hudsonicum. I am inclined to call this coloradicum, 



