206 



Cincinnati Society of Natural History. 



22. Enallagma exsulans Hagen. 



Columbus, May 12 to September 4; Sandusky, Sugar 

 Grove, Toledo, Oberlin (Lynds Jones). Our most abundant 



Enallagma. 



The coloration of the male is more nearly constant than in 

 Divagans; the markings of the female, on the contrary, vary 

 considerably, especially the black on the dorsum of 9. The 

 spot is either forked or solid ; in one it may extend the 

 whole length of the ring, in others occupy only the apical 

 third or fourth. Fifty pairs were captured, and the nature of 

 the mark on 9 noted. On thirty-four it was forked, on sixteen 

 solid. So, it appears the variety that has been taken for the 

 female of Divagans is really the normal form of exsulans. 



23. Enallagma signatum Hagen. 



Abundant at Sandusky in June and July ; Licking Reser- 

 voir, July ; Sugar Grove, September 4 ; Oberlin (Lynds 

 Jones). 



The immature insects are light blue, the adults brownish 

 orange 



24. Enallagma pollutum Hagen. 



Sandy Beach, near Lakeside, July 9, in large numbers ; 

 Licking Reservoir, July 25, not uncommon. 



The change of color from blue to orange is very similar to 

 that of Signatum. There is little difficult} 7 in separating the 

 females of Pollutum from those of Signatum. Those of the 

 former are a little larger and relatively slenderer ; the mid- 

 dorsal thoracic, black band is narrower and the humeral stripe 

 is practically wanting, as there is only a faint brownish suf- 

 fusion over the humeral suture. The species is of a lighter 

 orange than Signatum. 



25. Enallagma fischeri n. s. 



Columbus, Ma} 7 and June ; Sandusky, June and July ; Ober- 

 lin (Lynds Jones). Not uncommon. 



