THE MOUNT DESERT It EC ION 339 



Oxydiscus de Meijere (Adelphomyia Bergroth) 



0. amekicanus (Alex.). Echo Lake; Beech Mt. ; S. W. Har- 

 bor, Sept. 1-12 (A) ; Stations F220 and F239 (P). 



0. cayuga (Alex.)- S. W. Harbor, Aug. 30-Sept. 11 (A). 



0. mtnutus (Alex.). Canada Brook, Beaver Dam, June 13- 

 17 (A); Station F195 (P). 



Epiphragma Osten Sacken 



E. fascipexnis (Say). Sieur de Monts Spring-, June 4 (B) ; 

 Eden, June 12 (P) ; Canada Brook, Somes Sound Inlet, 

 Bubble Pond Inlet, Beaver Dam, Canyon Brook, 400 ft., 

 June 16-23 (A). The larva is a burrower in fallen stems 

 such as willow on the banks of temporary ponds, and has a 

 mode of respiration suited to enforced amphibian habits. 



Dactylolabis Osten Sacken 



D. hudsoxica Alex. With Hole Brook and Duck Brook, June 

 18 (A) ; Canyon Brook, 400 ft. (A B & H) ; in woods near 

 Beaver Dam, May 16 (B) ; Breakneck Brook, June 16 (H). 



D. montaxa (O. S.). Canyon Brook, June 23; Breakneck 

 Brook, June 16 (H) ; Beaver Dam, Bubble Brook, Duck 

 Brook, June 13-18 (A). 



D. pemetica Alex. New species taken on Canyon Brook, June 

 23, '35 (Br.). 



D. supekxumeraeia Alex. Witch Hole Brook, Duck Brook, 

 Beaver Dam, Bubble Pond Outlet, June 18-21 (A). 



Prolimnophila Alexander 



P. areolata (O. S.). Morrell Park, S. de Monts Spring, 

 Bubble Brook, Breakneck Brook, Duck Brook, Somes Sound 

 Inlet, Canyon Brook (A B & H) ; Green Mt., July 18 (A) ; 

 Station F254 (P). 



