26 Journal New York Entomological Society. [Vol. xxi. 



Genus PERITHEMIS Hagen. 

 P. domitia tenera Say. 



Tarrytown, N. Y., VII; Van Cortlandt, N. Y., VII; Bronxville, 

 N. Y., VII, VIII (Woodruff) ; Wading River, N. Y., Long Pond, 

 VIII; Flushing, N. Y., VIII; Prospect Park Lake, Brooklyn, N. Y., 

 VIII; Staten Island, VI, VII; Westfield, N. J., VII. 



Genus NANNOTHEMIS Brauer. 

 N, bella Uhler. 



Westchester Co., N. Y. (W. Beutenmuller, N. Y. list) ; Yaphank, 

 N. Y., VII; Wyandanch, N. Y., VII; Staten Island, VI, VII; Beaver 

 Lake, N. J., VI (Engelhardt) ; Lakehurst, N. J., V, VI, VII. 



Genus ERYTHRODIPLAX Brauer. 

 E. berenice Drury, 



Riverdale, N. Y., VII (Woodruff) ; Rockaway Beach, N. Y., VII, 

 VIII; Flushing, N. Y., VIII; Cold Spring Harbor, N. Y., VII (H. G. 

 Barber); Staten Island, V, VI, VII, VIII; S. Amboy, N. J., VII; 

 Seabright, N. J., VII (Woodruff). One was taken at Lakehurst, 

 N. J., July 28, 1907, but this dragonfly is usually not found so far 

 inland, and is often quite common on the salt meadows, where of a 

 quiet evening they may be seen settled on the grass stems, in which 

 position they spend the night. In many places where the meadows 

 have been ditched to prevent the mosquitoes from developing, this 

 dragonfly, which devours mosquitoes, has also become far less numerous. 



Genus ERYTHEMIS Hagen. 

 E. simplicicollis Say. 



Wading River, N. Y., VIII ; Yaphank, N. Y., VII; Flushing, N. Y., 

 VIII; Staten Island, V, VII, VIII; Fort Lee, N. J., V (Woodruff) ; 

 Westfield, N. J., VII ; Lakehurst, N. J., VI, VII. 



Genus SYMPETRUM Newman. 

 S. rubicundulum Say. 



Generally distributed and found from June until September. 



S. obtrusum Hagen. 



Staten Island, VI, VII ; Sandy Hook, N. J., VIII. 



