408 THE CANADIAN ENTOMOLOGIST 



though it has more colour in the front wing than the type Prob- 

 ably a good series would show that coloradicum and hudsonicum 

 intergrade. 

 Agrion aequabile hudsonicum (Hagen) . 



Proc. Boston Soc. Nat. Hist., 18, p. 22, 1875. 



cf and 9 types in the Mus. Comp. Zool., Cambridge, Mass. 



The types plus the thorax and wings of a third specimen are 

 all from Michipicoten, Lake Superior. These are the only speci- 

 mens of this variety that the writer has found in United States 

 collections. I think this has been taken recently by Dr. Walker. 

 It is characterized by the combination of little colour in the front 

 wing and much colour in the hind wing. As was stated at the be- 

 ginning of the article, this is said by Dr. Walker to intergrade with 

 var. cequahile. 

 Agrion aequabile yakima (Hagen). 



Psyche, 5, p. 248, 1890. 



& and 9 types in the Mus. Comp. Zool., Cambridge, Mass. 



Dr. Banks kindly re-examined the types of this species for the 

 writer and states that in the male the black in the front wing 

 reaches barely more than half the distance from the tip to the 

 nodus, and In the hind wing about two-thirds of the distance. 

 While the types are from the Yakima River, (Wash.), this is the 

 variety distributed through the Columbia River Valley. It has 

 been recorded from Montana, (Elrod; Sci. Bull. Univ. Mont., 

 p. 150-151, 1902), but the writer has seen none of the Montana 

 specimens. A single male specimen is in the Cornell collection 

 from Corvallis, Oregon. This is on the Willamette River, west of 

 the main range of the Cascade Mountains, and, therefore, outside 

 of the main Columbia River Valley, though the Willamette is a 

 tributary of the Columbia. This variety intergrades with the 

 next as is discussed in the succeeding section. 

 Agrion aequabile californicum Kennedy. 



Proc. U. S. Nat. Mus., 52, p. 483-484, 1917. 



cf and 9 types in the U. S. Nat. Mus., Washington, D. C. 



This form has the most colour on its wings of any of the 

 varieties of cequahile. The hind wing is as extensively coloured as 

 in hudsonicum, and the front wing has the colour extending more 

 than half way from the tip to the nodus. It is known from the 



