1200 NEW YORK STATE MUSETJM 



two; but I have here referred it to Isehnura chiefly because of 

 the form of the abdominal appendages in the male, and the small 

 round postocular spots. Its nymph I am not as yet able to 

 separate from those of several species of Enallagma. I. v e r - 

 t i c a 1 i s , seems, on the contrary, to be distinguishable by the 

 possession of six lateral setae in the njauphal labium; I have 

 seen one specimen of E. c a r u n c u 1 a t u m with this number 

 on one side, but no other specimen of Enallagma with more than 

 five. ' 



The species of Isehnura appear early in spring, being often 

 the first to be seen, and continue till late autumn, and have prob- 

 ably a number of overlapping broods each season. They fre- 

 quent all sorts of fresh and even somewhat brackish water, and 

 flit lightly around the shores, ovipositing in the stems of half 

 submerged water plants, or they forage somewhat widely over 

 the adjacent hill slopes. 



The nymphs likewise occur everywhere in water in which 

 there are stems of water plants to clamber on. 



Our species may be distinguished as follows: 



KEY TO SPECIES 



I?na(/os 



a Segments 8 and 9 of abdomen blue with a black stripe 



each side v e r t i c a 1 i s 



aa Segment 8 of abdomen blue, 9 black r a m b u r i i 



aaa Segments S and 9 of abdomen black posita 



Ni/ntphs 



a Labium with six lateral setae each side verticalls 



aa Lateral lobe of labium Avith live lateral setae posita 



<taa Unknown ramburii 



Isehnura verticalis Say 

 "Plate 16, fig. 5; plate 17, fig. 4, 5 

 1839 A g r i o n verticalis Say, Acad. Nat. Sci. Phila. Jour. 8:37 

 1861 A g r i n verticalis et 



A g r i n ramburii Hagen, Synopsis Neur. N. Am. p.76 and 82 

 1893 Isehnura verticalis Calvert, Am. Ent. Soc. Trans. 20:239 

 1895-97 Isehnura verticalis Calvert. N. Y. Ent. Soc. Jour. 3:44 



and 5:92 (listed from most parts of the State) 

 1898 Isehnura verticalis Davis, N. Y. Ent. Soc. Jour. 6:196 

 (listed from Staten Island) 



