3o6 CONNECTICUT GEOL. AND NAT. HIST. SURVEY 



PLATE I 



Tracheal gills of Zygoptera nymphs 



There are normally 3 gills attached to the abdomen but for 

 convenience only one or two are shown in most of the figures. 



1. Lestes unguiculatus 



2. Lestes vigilax 



3. Lestes congener 



4. Lestes euriniis 



5. Lestes disjunctus 



6. Lestes uncatus 



7. Enallagma geminatum 



8. Enallagma chrium 



9. Enallagma Jiageni 



10. Enallagma calverti 



11. Enallagma durum 



12. Enallagma donhledayi 



All greatly enlarged. Fig. 8 by B. H. Walden. 



