488 NEW YOKK STATE MUSEUM 



PLATE 11 



Oalopteryx macula t a Beauv. Male and female. Photo from 

 life by J. G. Needham 



PLATE 12 



H e t a e r i n a a m e r i e a ii a, 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 



Cliromagrion conditum and Argia viol?.cea 

 1 and 2 Resting and flying attitudes of C. conditum. 3 Nymph of 



same 

 4 A r g i a v i o 1 a c e a male. G Nymph of same 



PLATE 14 



Labia of Zygopterous nymphs 

 a Labium of Oalopteryx mac u lata, b Labium of H e t a e - 

 rina americana. c Labium of Lestes rectangular is, 

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

 e Labium of Argia sp.?, riglit 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- 

 magr ion conditum. 1i Right lateral lobe of labium of A m p h i - 

 agrionsaucium. i Left 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- 

 latum. 



PLATE 15 



Median caudal gills of Zygopterous nymphs 

 a Argia tibialis. ftChromagrion conditum. c^A m - 

 phiagrion saucium, cZNehallennia irene. eAnq ma- 

 lag r ion hastatum. 



PLATE 10 



Zygoptera 

 1 Lestes uucata Kirby. Fhuto from life by J. G. Needham 

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

 ham 



3 DraMnng of nymph of Enallagma carunculatum Morse 



4 Immature nymph of Enallagma antenuatum Say. Photo 

 from alcoholic specimen by J. G. Needham 



5Ischnura verticalis Say. Photo from alcoholic specimen 



PLATE 17 



Agiioninae 

 Drawings by Mrs J. G. Needham 



1 Argia apicalis Say 



2 E n a 1 1 a g m a s i g n a t u m Ilagen 



3 Enallagma c a r u n c u 1 1 a t u m INIorse 



4 (male) and ~) (female) I s c li n u r a verticalis Say 



