488 NEW YORK STATE MUSEUM 
PLATE 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 skins 
6 and 7 Nymphs in the rapids 
PLATE 13 
Chromagrion conditum and Argia violacea 
1 and 2 Resting and flying attitudes of C. conditum. 3 Nymph of 
same 
4 Argia violacea male. 5 Nymph of same 
PLATE 14 7 
Labia of Zygopterous nymphs 
a Labium of Calopteryx maculata. b Labium of Hetae- 
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 spinulose 
edge of median lobe shown highly magnified above. f Right lateral lobe 
of same more enlarged. g Right lateral lobe of labium of Chro- 
magrionconditum. h Right lateral lobe of labium of Amphi- 
agrion saucium. i Left lateral lobe of labium of Nehallennia 
irene. j Right lateral lobe of labium of Anomalagrion has- 
tatum. 
PLATE 15 
Median caudal gills of Zygopterous nymphs 
aArgia tibialis. }Chromagrion conditum. cAMm- 
phiagrion saucium. dNehallennia irene. eAnoma- 
lagrion hastatum. 
PLATE 16 
Zygoptera 
1 Lestes uncata Kirby. Photo from life by J. G. Needham 
2Enallagma exsulans Hagen. Photo from life by J. G. Need- 
ham 
2 Drawing 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 17 
Agrioninae 
Drawings by Mrs J. G. Needham 
1Argia apicalis . Say 
2Hnallagma signatum Hagen 
3 Enallagma caruncullatum Morse 
4 (male) and 5 (female) Ischnura verticalis Say 
we ol 
