240 NEW YOEK STAra MUSEUM 



The following keys will serve for the separation of our species^ 



KEY TO THE SPECIES 



Imagos 

 a Dorsum of the apical segments of the abdomen of 

 the male blackish; pterostigma surmounting 

 more than one cell, i. e. longer than the cell 



behind it putrid* 



aa Dorsum of apical segments of abdomen of male 

 with blue restricted to W-shaped basal marlis 

 on segments 8 and 9; stigma generally sur- 

 mounting somewhat more than a single cell. . translata 



aaa Abdominal segments 9 and 10 blue, 1-7 black tibialis 



aaaa Abdominal segments 8, 9 and 10 blue, 1-7 ringed 

 with blue or violet 

 6 Colors light blue and black: humeral stripe of 

 black very narrow, a mere line, suddenly 



widened at its lower end apicalis 



66 ~eolors deep blue and black, humeral stripe of 

 black very broad, broader than the preceding 



stripe of blue bipunctulata; 



666 Colors violet and black; humeral stripe bifid 

 superiorly, the posterior fork not reaching the 

 alar carina violacea 



Nymphs 



a With a single very minute lateral raptorial seta putrida 



aa With three or four well developed lateral setae 



6 With three well developed lateral setae (occasionally, a 

 rudimentary fourth In a p i c a 1 i s ) 

 c Median lobe of labium one third as long as it is wide a p i c a 1 1 3= 

 CO Median lobe of labium one fourth as long as it is wide v i o 1 a c e a 



66 With four well developed lateral setae tibialis- 



aaa Unknown bipunctulata and translata 



Argia putrida Hagen 



1861 Agrlon putridum Hagen, Synopsis Neur. N. Am. p.96 



1865 Argia putrida Selys, Acad. Belg. Bui. (2) 20:385 



1893 Argia putrida Calvert, Am. Ent. Soc. Trans. 20:232 



1896 Argia putrida Kellicott, Cincinnati Soc. Nat. Hist. Jour. 18:110 



(observations on manner of oviposltion) 

 1895-97 Argia putrida Calvert, N. Y. Ent. Soc. Jour. 3:43 and 5:92 



(listed from Niagara, Ithaca, Schoharie and BufEalo) 



1899 Argia putrida Kellicott, Odon. Ohio, p.23 (description and 



habits) 



1900 Argia putrida Williamson, Dragon Flies Ind. p.261 (descriptioni 



and habits) 

 1902 Argia putrida Williamson, Ent. News, 13:67 (ovipositlon; feed- 

 ing, fig. of eggs on pinnule of Osmunda. 



