Lake Maxinkuckee, Physical and Biological Survey 23 



33. ENALLAGMA DIVAGANS Selys 



A much darker species appearing almost black when flying and 

 found in company with the two preceding on the rushes in the 

 open lake. The habits of oviposition are similar but only a few 

 couples were found and the species appears to be rare. 



34. ENALLAGMA EXSULANS (Hagen) 



Another of the darker species, the black showing mostly when 

 flying. It is, next to hageni, the most abundant species among 

 the rushes, and was also found in the open herbage along the banks 

 of the Yellow River. 



35. ENALLAGMA SIGNATUM (Hagen) 



An orange and black species easily recognized by its colors. 

 The abdomen is noticeably slender, the black markings showing 

 more prominently in the male while flying, and the orange mark- 

 ings of the female. When at rest both sexes show the orange 

 markings plainly enough to distinguish them from the associated 

 species of the genus. Then, too, they are not common among the 

 rushes, but prefer the lily-pads at some distance from the shore. 



Found in the outlet of Lost Lake and in the South Inlet of Lake 

 Maxinkuckee. 



36. ISCHNURA VERTICALIS (Say) 



This is one of the species in which "at the time of imagination 

 two distinct color types of females appear." In one of these the 

 black, bluish, or grayish colors predominate, while the other is 

 brilliantly streaked with orange. Both of these types were found 

 with the green and black males upon the lily-pads in the outlet of 

 Lost Lake early in August. Their flight was markedly weak and 

 there was no trouble in capturing them. They alight, however, 

 only on the tops of the lily-pads and so the net must be carried 

 down into the water in order to capture them. 



37. ISCHNURA KELLICOTTI Williamson 



This species also has both the black and the orange females, 

 the former seemingly the more abundant. It was not found any- 

 where around the lake with the exception of a single male taken at 

 the South Inlet. But it was common at Hawk's marsh and many 

 specimens of both sexes and of both types of females were secured 

 there. The bright blue on the upper surface of the pterostigma of 

 the anterior wings of the male serves to distinguish this species 

 from the preceding. This is a species first discovered by William- 

 son and therefore of peculiar interest in the state. 



