DIPTERA. 93 



Simulium Latreille. 

 Subgenus Simulium Latreille. 

 S. venustum Say. "The Black Fly." 

 Me.— 3, 4, 5, 7, 8, 10. N. H.— 11, 13, 14. Vt.— 19. June 7- 



Aiig. 15. 

 Mass.— 25, 26, 27, 28. R. I.— 33, June 5-Sept. 28. 



S. piscicidium Riley. 



Me.— 1, 3, 4, 5, 8. N. H.— 11, 14. June 7-Aug. 21. 



Mass.— 27. May 26. 



S. bracteatum Coquillett. 



N. H. — Franconia (Mrs. Slosson). 



Mass.— Mt. Tom, Sept. 22; Framingham, Aug. 26, 1915 (Frost). 



S. parnassum Malloch, 14-36. 



N. H.— Red Hill, Moultonburgh, Aug. 5 (Dyar); White Mts. 

 (Morrison); Chatham, Aug. 21 (G. M. Allen); Alstead, Aug. 9 

 (Morse). Vt. — Chittenden, Aug. 1-15 (Bequaert); Killington 

 Peak, Aug. 28, 1919; Bolton Mt., July 16 (Brijant). 



S. meridionale Riley. 



Mass. — Worcester (Thompson); Wayland and Wellesley, Apr. 

 19, 1921 (Morse). R. I.— Kingston, Apr. 25 (Barlow). 



Subgenus Wilhelmia Enderlein, 21-44. 



S. vittata Zetterstedt. 



Me.— 7. July 12. 



Mass.— 25, 27. R. I.— 33. May 20- July 2. 



Blepharoceridae. 



Blepharocera Macquart. 

 B. tenuipes (Walker). 



Me.— 6, 8. N. H.— 11, 12. Vt.— 21, 22. June 13-July 10. 

 Mass.— 23. June 18-28. 



BRACHYCERA. 



Xylophagidae. 

 Rhachicerus (Haliday) Walker. 

 R. fulvicoUis Haliday. 



Mass. — Beverly (E. Burgess). 



R. nitidus Johnson. 



Me.— Bar Harbor, July 29, 1919. 



Xylophagus Meigen. 

 X. abdominalis Loew. 



Me.— Machias, July 27, 1909. N. H.— Durham, May 2. 

 Mass. — Auburndale, May 27-June 15; Wellesley (Morse); South 

 Sudbury, Apr. 22. 



