AQIATIC INSECTS IX NEW YORK STATE 261 



1S98 Ischnura verticalis Needham, Outdoor Studies, p.61, flg.61 



1899 Ischnura verticalis Kellicott, Odon. Obio, p.48 



1900 Ischnura verticalis Williamson, Dragon Flies Ind. p.278 



This pretty little species is perhaps the commonest damsel fly 

 in. Xorth 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 

 i'orm 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, Eev. Odon. d'Eur. p.l86 

 1876 Ischnura ramburii Selys, Acad. Belg. Bui. (2) 41:272 

 1861 Agrion iners 



Agrion tuberculatum 

 Agrion credulum 



Hagen, Synopsis Neur. N. Am. p. 75, 76, 80 

 1893 Ischnura ramburii Calvert, Am. Ent. Soc. Trans. 20:240 

 1895 Ischnura. ramburii Calvert, X. Y. Ent. Soc. Jour. 3:44 (listed 



from New Yorli) 

 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 posit um Hagen, Synopsis Neur. N. Am. p.77 



1867 Nehallennia positum Selys, Acad. Belg. Bui. (2) 41:1242 



1893 Nehallennia posita Calvert, Am. Ent. Soc. Trans. 20:235 



