260 NEW YORK STATE MUSEUM 



two; but I have here referred it to Ischnura 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 nymphal labium; I have 

 seen one specimen ofE. carunculatum 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 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 



Iinagos 



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



each side verticalis 



aa Segment 8 of abdomen blue. 9 black r a m b u r i 1 



caa Segmeats 8 and 9 of abdomen black p o s i t a 



Npmphs 



a Labium with six lateral setae each side verticalis 



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



caa Unknown ramburil 



Ischnura verticalis Say 

 Plate 16, 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. X. 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 Staten Island) 



