THE MOUNT DESERT REGION 371 



Cyrtidae. The Little-headt'd Flics 



Some of the species in this genus are parasitic on spiders. 

 Sweeping bushes in swampy places is the only general wax- 

 to take them. 



Ogcodes Latreille 



0. pallidipennis Loew. Long Pond ; Eden, July 16-Aug. 7. 

 0. costatus Loew. S. W. Harbor, July 15; Eden, June 25- 

 July 13 (C. H. Blake) ; Bar Harbor (Br.), July 2. 



Obsebius Costa 



O. pterodontinus 0. S. Top of Robinson Mt., May 1, 1912 

 (Fernald). 



Acrocera Meigen 



A. bulla Westwood. Mt. Desert mating pair, Julv 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. 



Syndyas Loew 



S. dorsalis Loew. Breakneck Pond, Sept. 8. 



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



Hybos Meigen 



H. slossonae Coq. S. W. Harbor, July 13-30. Seal Harbor 

 Br. Aug. 



