1920] Hoice — Odonata of Chatham, Massachusells 51 



10. Enallagma signatum (Hagen). Chatham, July 20. Not 



recorded from east of Wareham and Woods Hole before. 



11. Enallagma doubledayi Selys. South Orleans, July 8 to Aug. 



23. It has been reported from Provincetown by Mr. E. B. 

 Williamson, and from Woods Hole, Nonamesset Island, by 

 Dr. P. P. Calvert. 



12. Nehalennia irene (Hagen). Chatham, Provinceto\\TQ, July 12. 

 Not recorded from east of Cotuit before. 



13. Ischnura posita (Hagen). Chatham, Wellfleet, Barnstable, 

 July 4 to July 22. Not recorded from east of Woods Hole 

 before. 



14. Ischnura verticalis (Say). Chatham, Eastham, Wellfleet, South 

 Orleans, Brewster, Barnstable, South Yarmouth, July 8 to 

 Sept. 8. Abundant on Cape Cod. 



Anisoptera. 

 ^schnidse. 



15. Progomplms ohscurns Ramb. South Orleans, July 12-14. 



Recorded only from Boston and Wareham before, this being 

 the third station for New England. 



16. Anax Junius (Drury). Orleans, South Orleans, Chatham, July 



3 to Sept. 6. Great migrating swarms of this species were 

 noted at Chathamport. An abundant Cape Cod species. 



17. JEshna umbrosa Walk. Orleans, Chatham, Oct. 19. Not re- 



corded before from east of Wareham and Woods Hole on Cape 

 Cod. 



18. Mshna clepsydra Say. Chatham, July 11 to Aug. 23. Com- 



mon on Cape Cod. 



19. Mshna canadensis Walk. Chatham, Aug. 23. Not taken 

 from east of Wareham and Woods Hole before on Cape Cod. 



Libellulidae. 



20. Epicordulia princeps (Hagen). Chatham, White pond, July 



24. Not recorded before from east of Wareham on Cape Cod. 



21. Tetragoneuria cynosura (Say). Orleans, July 1-3. Not 

 recorded from east of Wareham or Woods Hole before. 



22. Libelhda exusta (Say). Chatham, July 7. Not recorded 



before from east of West Chop and Woods Hole. 



