



EXPLANATION OF MARKS, $c. 



v. r. Signifies that American specimens have been examined by 

 the Author in a fresh state. 



r. s. That they have been examined in a dry state, or only revi- 

 vified. 



Coll. Europ. That the American specimens have been compared 

 with European ones. 



* An aster icus signifies that the species has not before been ob- 

 served in America. 



f That the species is exclusively American. 



\ That the species has been named by the Author as a new one. 



§ Before the number of the species, signifies that it is found about 

 Salem. 



