"260 NEW YORK STATE MUSEUM 



two; but I hare here referred it to Isclmura cliiefly 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 nymphal 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 Ischnura 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 somew^hat 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 



Imagos 



a Segments S 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 p o s i t a 



a Labium v/ith six lateral setae each side y e r t i e a 1 i s 



aa Lateral lobe of labium with five lateral setae p o s i t a 



<iaa Unknown ramburii 



Ischnura verticalis ^^ay 

 Plate IG, fig. 5; plate 17, fig. 4, 5 

 1839 Agrion verticalis Say, Acad. Nat. Sci. Phila. Jour. 8:37 

 1861 Agrion verticalis et 



Agrion ramburii Hagen, Synopsis Neur. N. Am. p. 76 and 82 

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

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



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

 1898 Ischnura verticalis Davis, X. Y. Ent. Soc. Jour. 6:196 

 (listed from Stateu Island) 



