488 NEW YORK STATE MUSEUM 



PliATE 11 



Calopteryx maculata Beauv. Male and female. PhotO' from 

 life by J. G. Needham 



PLATE 12 



Hetaerina americana, executed from nature, under the author's 

 direction, by L. H. Joutel 

 1 and 2 Males 



3 Female 



4 and 5 Cast nymph isbins 



6 and 7 Nymphs in the rapids 



PLATE 13 



Chromagrion coriditum and Argia violacea 

 1 and 2 Resting and flying attitudes of O. c o n d i t u m . 3 Nymph of 



same 

 4 Argia violacea male. 5 Nymph of same 



PLATE 14 



Labia of Zygopterous nymphs 

 a Labium of Calopteryx maculata. 6 Lfabium of Hetae- 

 rina americana. c Labiumi 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 spinulose 

 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 - 

 magrlonconditum. A Right lateral lobe of labium of A m p h i - 

 agrionsaucium. i Left lateral lobe of labium of NehaUennia 

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

 t a t u m . 



PLATE 15 



Median caudal gills of Zygopterous nymphs 

 a Argia tibialis. 6 Chromagrion conditum. cAm- 

 phiagrion saucium. dNehallennia Irene. eAnoma- 

 lagrlon hastatum. 



PLATE IG 



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 Dravs^ing of nymph of Enallagma carunculatum Morse 



4 Immature nymph of Enallagma antennatum Say. Photo 

 from alcoholic specimen by J. G. Needham' 



5 Ischnura verticalis Say. Photo from alcoholic specimen 



PLATE IT 



Agrioninae 

 Drawings by Mrs J. G. Needham 



1 Argia apicalis Say 



2 Enallagma signatum Hagen 



3 Enallagma caruncullatum Morse 



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



