AQUATIC INSECTS IN NEW YORK STATE 261 
1898 Ischnura verticalis Needham, Outdoor Studies, p.61, fig.61 
1899 Ischnura verticalis Kellicott, Odon. Ohio, p.48 
1900 Ischnura verticalis Williamson, Dragon Flies Ind. p.278 
This pretty little species is perhaps the commonest damsel fly 
in North America. It is everywhere common in this State, 
ranges through the whole season, and is out early in the morn- 
ing and flies till dusk. It will be readily recognized in the male 
sex by the black bars on a blue ground on the sides of the eighth 
and ninth abdominal segments. 
I have bred the species at every station where I have done any 
extended collecting, and at various dates, but oftenest in June 
and July. 
Nymph. Measures in total length 11mm; gills 5mm additional. 
Color greenish, paler beneath and on the sutures with darker 
mottlings on the top of the head, and more or less distinct 
subapical rings on the femora; abdominal segments with darker 
apical rings including a circlet of pale dots; gills hyaline with 
tracheae showing very distinctly and pigmentation tending to 
form incomplete transverse bands of blackish brown. 
Antennae seven jointed. Labium with six lateral and four 
mental setae each side; end of lateral lobe with three distinct 
and strong teeth above the end hook and a denticulate angle 
next the movable hook. 
Ischnura ramburii 
1850 Agrion ramburii Selys, Rev. Odon. d’Eur. p.186 
1876 Ischnura ramburii Selys, Acad. Belg. Bul. (2) 41:272 
1861 Agrion iners 
Agrion tuberculatum 
Agrion credulum 
Hagen, Synopsis Neur. N. Am. p.75, 76, 80 
18938 Ischnura ramburii Calvert, Am. Ent. Soc. Trans. 20:240 
1895 Ischnura ramburii Calvert, N. Y. Ent. Soc. Jour. 3:44 (listed 
from New York) 
1898 Ischnura ramburii Davis, N. Y. Ent. Soc. Jour. 6:196 (listed 
from Staten Island) 
A species apparently with coastwise distribution. Its nymph 
is unknown. 
Ischnura posita Hagen 
1861 Agrion positum Hagen, Synopsis Neur. N. Am. p.77 
1867 Nehallennia positum Selys, Acad. Belg. Bul. (2) 41:1242 
1898 Nehallennia posita Calvert, Am. Ent. Soc, Trans, 20:235 
