488 NEW YORK STATE MUSEUM 



PLATE 11 



Calopteryx maculata Beauv. Male and female. Photo from 

 life by J. G. Needham 



PLATE 13 



Hetaei'ina americana, executed from nature, under the author's 

 direction, by L. H. Joutel 

 1 and 2 Males 



3 Female 



4 and 5 Cast nymph skins 



6 and 7 Nymphs in the rapids 



PLATE 13 



Chromagrion conditum and Argia violacea 

 1 and 2 Resting and flying attitudes ofC. conditum. 3 Xymph of 



same 

 4 Argia violacea male. 5 Nymph of same 



PLATE 14 



Iiabia of Zygopterous nymphs 

 a Labium of Calopteryx maculata. b Labium of H e t a e - 

 rina americana. c Labium of Lestes rectangularis, 

 right lateral lobe omitted, d Left lateral lobe of same, more enlarged, 

 e Labium of Argia sp. ?, right lateral lobe omitted, portion of spiuulose 

 edge of median lobe shown highly magnified above, f Right lateral lobe 

 of same more enlarged, g Right lateral lobe of labium of C h r o - 

 magrion conditum. h Right lateral lobe of labium of A m p h 1 - 

 agrionsaucium. i T^eft lateral lobe of labium of N e h a 1 1 e n n i a 

 Irene. ; Right lateral lobe of labium of Anomalagrion has- 

 t a t u m . 



PLATE 16 



Median caudal gills of Zygopterous nymphs 

 a Argia tibialis, b Chromagrion conditum. cAm- 

 phiagrion saucium. dNehallennia Irene, e Anoma- 

 lagrion hastatum. 



PLATE 10 



Zygoptera 



1 Lestes uncata Kirby. Photo from life by J. G. Needham 



2 Enallagma exsulans Hagen. Photo from life by J. G. Need- 

 ham 



3 Drawing of nymph of Enallagma car uncula turn Morse 



4 Immature nymph of Enallagma antennatum Say. Photo 

 from alcoholic specimen by J. G. Needham 



5Ischnura verticalis Say. Photo from alcoholic specimen 



PLATE 17 



Agrioninae 



Drawings by Mrs J. G. Needham I 



1 Argia apicalis Say 



2 Enallagma signatum Hagen 



3 Enallagma caruncullatum Morse 



4 (male) and 5 (female) Ischnura verticalis Say 



