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Bulletin Wisconsin National History Society. [Vol. 9, No. 4. 



C. resolution M2 arising at 



Fore Wings. 



Postnodal 5 57 wings. 



4Vb 10 

 4 33 



Hind Wings. 



Postnodal 4 27 wings. 



3y 2 26 

 3 47 



Of other species of Coenagrion, the following also show some 

 variation : 



Postnodal 5 10 wings. 



4 2 " 



Postnodal 4 10 wings. 



3y 2 2 



C. nigrohamatum shows the following, respectively: 



7:7 5% : 5% 



(7. calliphya 7:7-5 :5 



C xanthomelas 0:6 - 5:5 



C. fti/Zas 6:5 - 4i/ 3 : 4%; 6:0-4:4 



0. hastulatum 4:4-3% : 3% ; 4 :4 - 3% : 3 



C. glaciate 5:5 - 4 :4 



C. ecornutum 5:5-3% : 3% ; 5:5-4:4 



C. lanceolatum 3% : 4 - 5:5 - 4:4; 5:5 - 4 :4 



C. vernale 5:5-4:3%; 5:5-4:4: 5:5-4:4; 5:5-4:4 



C. armatum 5:5 - 4:4; 4:5 -4:4 



0. lindeni 5 :6 - 4% : 4 



C. ornatiini 4% : 5 - 4 :4 



Of the last species one male is thoroughly erratic, one fore 

 wing (right) being without M2, while in the left fore wins and 

 right hind wing the first postnodal is not continued to M2. In the 



