198 Journal New York Entomological Society. [Vol. vi. 



Libellula cyanea Fabricius. June, July, August. 



Libellula exillena Westwood,.ioxva. vibrans {Fabricius .?) Kirby. 

 Not uncommon on the Island in August, 1894; much less common in 

 July, 1895. 



Libellula exillena Westwood, form* incesta Hagen. July, 

 August. 



Libellula quadrimaculata Linne. Arlington, May 11, 1889, 

 and plentiful June 19, 1893. 



Libellula semifasciata Burmeister, April 25, 1896. May, June, 

 July, August, September. 



Libellula pulchella Drury. May, June, July, August, September. 



Plathemis trimaculata De Geer. May, June, July, August, 

 September. 



Micrathyria berenice Drury. May, June, July, August. Often 

 of a quiet summer evening countless numbers of this species will be seen 

 settled on the grass stems in the salt meadows, in which position they 

 spend the night. When they are particularly abundant the July crop 

 of mosquitoes is speedily reduced in numbers, being devoured at head- 

 quarters. 



Nannothemis bella Uhler. June and July, 1888, at the Four 

 Corners iron mine ponds. 



Celithemis elisa Hagen. June, July, August. 



Celithemis eponina Drury. May, July. 



Leucorhinia intacta Hagen. May, June. 



Diplax rubicundula Say. July, August, September. 



Diplax obtrusa Hagen. July. 



Diplax semicincta Say. July 15, 1894. Four Corners iron 

 mine ponds. 



Diplax vicina Hagen. September, October, November. While 

 my companion and I were sitting in the sun on October 21, 1892, five 

 of these dragonflies at one time lit upon us, wishing to sun themselves 

 also. Some lit on my hands — one on the end of my thumb. The 

 dragonflies are most attracted if you have on light colored garments, or 

 a newspaper spread on the ground is a favorite resting place. 



Diplax corrupta Hagen. Shore at Eltingville, May 27, 1896. 

 (See this Journal, Vol. V, p. 95.) 



Perithemis domitia Drury. June, July. 



Mesothemis simplicicollis Say. June, July, August. 



Pachydiplax Iongipennis Burmeister. June, July, August, Sep- 

 tember. 



