Vol. XXX ] KNTO.MllLOCK \l. NKWS I ^ 



Aeshna umbrosa Walk. Common; August 15 to October 20. 

 Aeshna verticalis Hagen. Common; August 15 to October 2. 

 Epiaeschna heros (Fabr.). Rare; Bateman's pond. June 7. Re- 

 corded by Peirson in May. 



LlBELLULIDAE. 



Didymops transversa (Say). Common; Bateman's, Willow, Wai- 

 den ponds, May 17 to June 23. 

 Epicordulia princeps (Hagen). Common; Bateman's pond, May 



25 to August 29. 



Helocordulia uhleri (Selys). Rare; Willow, Bateman's pond, Spen- 

 cer brook, May 17 to June 18. 



Tetragoneuria cynosura (Say). Abundant; May 3 to June 20. 

 Tetragoneuria cynosura var. simulans Mutt. Uncommon; Bate- 

 man's pond, May 28 to June 23. 



Tetragoneuria morio Mutt. Rare; Bateman's pond, May 20 to 29. 

 Tetragoneuria spinigera Selys. Uncommon; Bateman's pond, May 



19 to June 18. 



Dorocordulia libera (Selys). Rare; Bateman's pond, June 8-9. 

 Dorocordulia lepida (Hagen). Rare; Bateman's pond, August 9 



to 13. 

 Williamsonia lintneri (Hagen). Rare; Bateman's and Willow 



pond. May 16 to June 1. Recorded by Peirson. 

 Cordulia shurtleffi Scud. Rare; Bateman's pond, June 9-27, and 



Flaxdam pond, Wayland. 

 Somatochlora kennedyi E. M. Walker. Common; Bateman's pond, 



upper Spencer brook, June ?> to 24. 



Somatochlora tenebrosa (Say). Rare; Bateman's pond, Septem- 

 ber 8. 

 Somatochlora walshii (Scudder). Rare; a male found floating on 



the Assabet River on September 15, 1918, by H. M. I\ yes. 

 Libellula cyanea Fabr. Uncommon; Willow and Bateman's pond, 



June 4 to September 4. 



Libellula exusta (Say). Common; May 19 to July. 

 Libellula flavida Ramb. Rare; Fairyland, August 14. 

 Libellula incesta Hagen. Abundant; June G to September 17. 

 Libellula luctuosa Burm. Common; Bateman's, Fairyland ponds. 



June 16 to August 19. 



Libellula pulchella Drury. Abundant; June fi to Septen 

 Libellula quadrimaculata I. inn. Common; Walden, Goose. Bate- 

 man's, Strawberry Hill ponds, May 19 to August 19, 

 Libellula semifasciata Burm. Rare; John Brown farm. Strawberry 



Hill pond, June 9 to August 22. 



Plathemis lydia (Drury). Common: May 27 to SepU'inlxT 

 Perithemis domitia var. tenera (Say). Common; Bateman's, John 

 Brown farm ponds, July to September 5, 



