DIPTERA. 39 



T. senega Alexander, 15-128 (T. pallida Loew, not de Villers). 

 Me.— 4, 8. N. H.— 11, 13, 14, 15. Vt.— 18, 21. May 25- 



July 18. 

 Mass.— 23, 24, 25, 27, 32. R. I.— 33. Conn.— 35. May 23-July 5. 



T. septentrionalis Loew. 



N. H.— Mt. Washington, "Alpine Garden," July 4. 



T. serta Loew. 



Me.— 5. N. H.— 11, 14, 15. Vt.— 17, 21. May 25-Sept. 3. 



Mass.— 23, 27, 32. R. L— 33. Conn.— 35. May 22-June 19. 



T. similissima Dietz, 21-293. 



Me.— 4, 7, 8. N. H.— 11. Vt.— 20. June 12- July 19. 



T. simulata Walker. 



N. H. — Mt. Washington {Mrs. Slosso7i). 



T. strepens Loew. 



Me.— 7, 8. N. H.— 11. Vt.— 21. June 8-July 19. 



Mass.— 23, 27. Conn.— 35. May 26- June 25. 



T. submaculata Loew. 



Me.— 8. N. H.— 11, 15. Vt.— 16, 18. May 31-July 12. 



Mass.— 23, 24, 27, 32. Conn.— 35. May 30-July 14. 



T. sulphurea Doane. 

 Me. — Orono, June 12 (Alexander). 



Mass. — Amherst, May 14; Leverett, Sept. 5 (Alexander). 

 R. I. — Kingston, Apr. 24 (Barlow). 



T. suspecta Loew. 



N. H. — Mt. Washington (Mrs. Slosson). 



T. taughannock Alexander, 15-476. 

 Vt. — Mt. Equinox, June 5, 1910. 



T. tephrocephala Loe iv. 



Me.— 3, 4, 7, 8. N. H.— 11. Vt.— 21. June 6-July 18. 

 Mass.— 23, 24, 26, 27, 29, 32. R. L— 33. Conn.— 35. May 

 30- June 29. 



T. tricolor Fabricius. 



Mass.— 23, 24, 25, 27, 28, 29, 30. Conn.— 35. May 25-Sept. 5. 



T. trivittata Say. 



Me.— 6, 7, 8, 10. N. H.— 11, 12, 14, 15. Vt.— . June 5- 



July 14. 

 Mass.— 23, 24, 27, 28. Conn.— 35. May 24-June 26. 



T. ultima Alexander, 15-128 (T. flavicans Fabricius, not de Vil- 

 lers). 



Me.— 1, 6, 8, 9. N. H.— 11, 13, 15. Vt.— 20. Aug. 28- 

 Sept. 24. 



Mass.— 24, 25, 26, 27, 28, 32. R. L— 33. Conn.— 34, 35. 

 Aug. 27-Sept. 22. 



