THE MOUNT DESERT REGION 49 



E. cyathigerum (Charp.). A common widely distributed 



form. 

 E. ebrium Hagen. This species travels far from the ponds. 



Common. 

 E. exsulans (Hagen). A stream species. N. E. Harbor 



(Merrill). 

 E. hageni (Walsh). A very common form which occurs at 



times in great abundance from the first of June to the last 



of August. 

 E. minusculum Morse. Echo Lake, July 12. Scarce here 



and no females taken. 

 E. vesperum Calvert. Mt. Desert, 1941 (Ahrens). 



Ischnura Charpentier 



I. verticalis (Say). Common from the first of June to Sep- 

 tember. 



Anisoptera 



Gomphidae 



Hagenius Selys 



H. brevistylus Selys. A form that is on brooks. Brook from 

 Toad Hole. 



Ophiogomphus Selys 



0. rupinsulensis (Walsh). Eagle Lake, 1918 (Howe). 



Gomphus Leach 



G. (gomphus) exilis Selys. Witch Hole Pond; Bar Harbor, 

 June 6-July 30. Common about ponds. 



G. (gomphus) spicatus Hagen. Witch Hole Pond; Bar Har- 

 bor, June 11-July 30. Same habitat as above. 



Dromogomphus Selys 



D. spinosus Selys. Mt. Desert, 1941 Ahrens. 



