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Survey   Mass.
Drainage    
Coll. No.   517
Locality   Hoar's Dam and Concord River, Concord
County   Middlesex
Quadrangle
Elevation
Water   brown, clear
Flow
Width   
Vegetation   abundant in ponds, common on river edge
Bottom     humus
Current    
Shore   open (ponds)  wooded (river)
Distance from shore  
Temperature:
Air
Water
Time    
Weather   clear
Depth of Capture   
Depth of Water   
Method of Capture   net
Date   June 20, 1954
Collected by   R.H. & S.P. Gibbs
Orig. preserv.    pot. cyanide
Time    12:00 - 3:00 DST
General notes: 

unid. Gomphine on river

Tetragoneuria cynosura - com. - 6♂
Epicordulia princeps - sev. on river - seen
Libellula luctuosa - com. - 2♂
L. incesta - 1♂
L. cyanea - few -1♂

Pachydiplax longipennis- very ab. - 1♂ 1♀ (tandem)
Erythemis simplicicollis - com. - 1♂
Leucorrhinia intacta - sev. - 3♂
Chromogrion conditum - 1♂
Lestes inequalis - 1♂ 1♀ near river
L. rectangularis - sev. seen near river
Argia violacea - 1♂ seen near river
Ischnura verticalis - seen
I. posita - 1♂
Enallagma hageni - 8♂
E. geminatum 4♂ 2♀