CONNECTICUT GEOL. AND NAT. HIST. SURVEY 



[Bull. 



Nymphs of the genus are also climbers upon vegetation in small 

 lakes or ponds. The adults are very strong fliers and able to elude 

 the most persistent collector at times; and are most commonly 

 seen on the wing in Connecticut the latter part of the summer, 

 from the middle of July on. The eggs are laid upon various 

 plants beneath the surface. 



Anterior lamina . L 



Spine <>- 



Fig. 25. Ventral view of the second abdominal segment of male Aeshnas 

 showing details used in classification. 



The following groups of the genus Aeshna have been recognized by 

 Walker, 1912. 



Group I. The caerulea group — a boreal or circumpolar group without 



representatives in Connecticut (p. 183). 

 Group 2. The juncea group — including juncea (p. 183). 

 Group 3. The clepsydra group — including clepsydra, eremita and inter- 



rupta, also canadensis, verticalis and tuberculifera (p. 183). 

 Group 4. The cyanea group — including umbrosa and constricta (p. 189). 

 Group 5. The californica group — without eastern representatives. 

 Group 6. The multicolor group — including the eastern mutaia (p. 192). 



For literature pertaining to the genus see 



Walker, E. M. University of Toronto Studies No. 11, 1912: 213 pages, 

 28 plates. 



Oviposito. -J ^- Lateral plate 



Fig. 26. Lateral view of terminal abdominal segments and ovipositor of 

 female Aeshnas showing details used in classification. 



Key to Species 



Nymphs ^ 



I. Mentum extending to the hind coxae, and slightly exceeding the 



hind femora in length tuberculifera 



Mentum not reaching the hind coxae and shorter than the hind 

 femora 2 



22 Taken from Walker, 19 12 — verticalis is unknown as a nymph. 



