240 NEW YORK STATE 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 
DObiING “it. eae Vs doe eS ee ees ss eee eee putrida 
aa Dorsum of apical segments of abdomen of male 
with blue restricted to W-shaped basal marks 
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 
b Colors light blue and black: humeral stripe of 
black very narrow, a mere line, suddenly: 
widened at. 1ts lower eng. «2 oo. ~~ Sseine ose ee cee apicalis 
bb Colors deep blue and black, humeral stripe of 
black very broad, broader than the preceding 
Stripe: OG Dhue. 22 nae 2 cee kee ee bipunctulata 
bbb Colors violet and black; humeral stripe bifid 
superiorly, the posterior fork not reaching the 
BEAT PATI is: 5. Be Ae oid ihe htege co al ee vViolacea 
Nymphs 
a With a single very minute lateral raptorial seta........ putrida 
aa With three or four well developed lateral setae 
b With three well developed lateral setae (occasionally, a 
rudimentary fourth in apicalis) 
c Median lobe of labium one third as long as itis wide apicalis 
cé Median lobe of labium one fourth as long as itis wide violacea 
bb With four well developed lateral setae................ tibialis 
BOG ADERNOWND « « a)4 «<,¢2t atGhk SEN Oee bipunctulata and translata 
Argia putrida Hagen 
1861 Agrion putridum Hagen, Synopsis Neur. N. Am. p.96 
1865 Argia putrida Selys, Acad. Belg. Bul. (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 oviposition) 
1895-97 Argia putrida Calvert, N. Y. Ent. Soc. Jour. 3:48 and 5:92 
(listed from Niagara, Ithaca, Schoharie and Buffalo) 
1899 Argia putrida Kellicott, Odon. Ohio, p.23 (description and : 
habits) 
1900 Argia putrida Williamson, Dragon Flies Ind. p.261 (description 
and habits) 
1902 Argia putrida Williamson, Ent. News, 13:67 (oviposition; feed- 
ing, fig. of eggs on pinnule of Osmunda. 
