118 PR0CEEDTN08 OF THE NATIONAL MUSEUM. vol.46. 



By selecting from each column of the foregoing tables the character 

 held by the greatest number of individuals the followmg general 

 description is made up: Female, abdomen 36 mm., hmd wing 30 

 mm., eight antecubitals and seven postcubitals in fore wing, five 

 antecubitals and seven postcubitals m hind wmg, one vein in tri- 

 angle of fore wing, no veins m triangle of hind wmg, three veins in 

 internal triangle of fore wing. No feniale had this combination of 

 characters. 



SYMPETRUM CORRUPTUM (Hagen). 



One female belonging to this species was taken 1 mile above the 

 outlet, on the south shore, and 8 or 10 mdividuals were seen along 

 the lake shore. 



These species are widely distributed over North America, and of 

 the last three, each in its own genus is an exceptionaUy vigorous 

 and wide flier. 



