AQUATIC INSECTS IN THE ADIRONDACKS 



499 



genitalia of both sexes of the five species hsted below. These are the 

 characters most used in characterizing them, and are the ones most 

 reliable in determining specimens. These figures show the appendages 

 to be unusually well marked with individuahty. The nymphs of this 

 genus offer an open field for study by collectors in boreal latitudes. 

 Four species, tenebrosa, walshii, linearis and e 1 o n g a t a , 

 are recorded from the state. To this I have nothing to add but a new 

 locality for the last named, and a partial life history of it. One other 

 species occurs farther southward, and is almost certain to be taken in this 

 state eventually, and is therefore included among the species listed below. 



Somatochlora elongata Scudder 



Plate 21, flg. 15 

 1866 Cordulia elongata Scudder, Bost. soc. nat. hist. Proc. 10:218 

 1895 Soma t oc hi ora elongat a Calvert, N. Y. ent. soc. Jour. 3:46 (listed 

 from Ithaca) 



The few imagos I saw of this species were flying with great swiftness 

 about the borders of Bone pond. The single nymph I found was taken 



Fig. 23 Somatochlora elongata Scudd., end of abdomen ; d and e of male ; /of female 



from Litde Clear pond, -as stated above, and transformed July 5. A cast 

 nymph skin was found later in the season on the north side of the outlet 

 of Little Clear, sprawling on a bed of moss but a few inches above the 

 water line. 



