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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♀