320 BIOLOGICAL SURVEY OF 



AcROCERA Meigeii 



A. BULLA Westwood. Mt. Desert mating pair, July 20, '22 



(Br.). 

 A. OBSOLETA Wulp. Gt. Heath (Br.), Aug. 4, '35, near spider's 



web. 



A. n.sp. Mt. Desert, Aug. 6, '37 (Br.). 



Empidae. The Dance Flies 



Very common on shores, moist woods, mossy patches, and 

 the various species vary in their habitat. 



Syneches Walker 



S. SIMPLEX Walk. Salisbury Cove, July 15. 



Synbyas Loew 



S. DOKSALis Loew. Breakneck Pond, Sei3t. 8. 



S. POLiTA Loew. S. W. Harbor ; Echo Lake, July 11-12. 



Hybos Meigeii 



H. SLossoNAE Coq. S. W. Harbor, July 13-30. 



EuHYBOS Coquillett 



E. TRIPLEX Walk. S. W. Harbor ; Bar Harbor, June 21-Julv 

 26. 



BiCELLARiA Macquart 



B. piLiPEs Loew. Salisbury Cove; S. W. Harbor, July 27- 

 Aug. 26. 



Leptopeza Macquart 



L. coMPTA Coq. S. W. Harbor; N. E, Harbor; Echo Lake, 



June 16-July 12. 

 L. FLAviPEs Meig. Bar Harbor ; Echo Lake, June 7-27. 



