AQUATIC INSECTS IX NEW YORK STATE 261 



1898 I s c h n u r a v e r t i c a 1 i s Xeedham, Outdoor Studies. p.61, fig.Gl 



1899 I s c h u u r a v e r t i c a 1 i s Kellicott, Odon. Ohio, p.48 



1900 I s c h n u r a v e r t i c a 1 i s Williamson, Dragon Flies lud. p.27S 



This pretty little species is perhaps the commonest damsel fly 

 in North America. It is eyerywhere 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 haye bred the species at eyery station where I haye done any 

 extended collecting, and at yarious 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 yery distinctly and pigmeutatiou tending to 

 form incomplete transyerse bands of blackish brown. 



Antennae seyen jointed. Labium with six lateral and four 

 mental setae each side; end of lateral lobe with three distinct 

 and strong teeth aboye the end hook and a denticulate angle 

 next the moyable hook. 



Ischnura ramburii 



1850 A g r i n r a m b u r i i Selys. Rev. Odon. d'Eur. p. 186 

 1876 I s c li n u r a ramburii Selys, Acad. Belg. Bui. (2) 41:272 

 1861 A g r i n iners > 



Agrion tuberculatum |> 

 A g r i o n c r e d ii 1 u m J 



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

 1893 Ischnura ramburii Calvert, Am. Ent. Sec. Trans. 20:210 

 1895 Ischnura ramburii Calvert, N. Y. Ent. Soc. Jour. 3:41 (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 p o s i t u m Hagen, Synopsis Neur. N. Am. p. 77 



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



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



