THE MOUNT DESERT REGION 51 



COBDULEGASTERIDAE 

 CORDULEGASTER Leach 



C. diastatops (Selys). On all the streams during the warm 

 weather. S. W. Harbor, June 20. 



C. maculatus Selys. Another form that patrols streams. 

 Outlet Eagle Lake; Bubble Brook, June 16, July 20. 



CORDULIIDAE 

 MACROMIA Rambur 



X. ELLiNoiENSis Walsh. Mt. Desert, 1941 (Ahrens). 



Didymops Selys 



D. transversa (Say). A wide ranging form that is common 

 on all parts of the island from the middle of June to August. 



Tetragoneuria Hagen 



T. cyxosura (Say). Echo Lake, July 12. A strong flying 



form over ponds. 

 T. spinigera Selys. Breakneck Road ; Witeh Hole, June 6-12. 



A northern form. 



Hf.locordulia Needham 



H. uhleri (Selys). A bog loving species and flying from 

 June to the end of July. 



SoMATOCHLORA Selys 



S. elongata (Scudder). One specimen taken, Breakneck 



Rd., June 16, '35 (Alexander). Rare. 

 S. forcipata (Scudder). Echo Lake, 1941 (Ahrens). 

 S. kennedyi Walker. Echo Lake, 1941 (x\hrens). 

 S. minor (Calvert). Mt. Desert, 1941 (Ahrens). 

 S. tenebrosa (Say). Mt. Desert, 1941 (Ahrens). 

 S. walshii (Scudder). Mt. Desert, 1941 (Ahrens). 

 S. williamsoxi (Walker). Mt. Desert, 1941 (Ahrens). 



