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. ver- 
ticalis, 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. 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 
Imagos 
a Segments 8 and 9 of abdomen blue with a black stripe 
eseh “side 58 th. ten eee bes Rae eiche Soe ee vertiecalis 
aa Segment 8 of abdomen blue, 9 black.................. ramburii 
aaa Segments 8 and 9 of abdomen black.................. posita 
Nymphs . 
a@ Labium with six lateral setae each side....... 2 alae verticalis 
ad Lateral lobe of labium with five lateral setae.......... posrta 
aia Tia a he ow a wee teem, ine eats eekceaaee eee rampbarii 
Ischnura verticalis Say 
Plate 16, fig. 5; plate 17, fig. 4, 5 
18389 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 vertiecalis Davis, N. Y. Ent. Soc. .Jour, 6196 
(listed from Staten Island) 
