THE MOUNT DESERT REGIOX 53 



Order PLECOPTEEA 



This family is of course collected along brooks. The same 

 brook should be visited at least every ten days during the 

 season so that the hatches of the different genera may be 

 collected. 



Perlidae. The Stone-flies 

 Perla GeoffroT 



P. iMMAEGiNATA Say. Duck Brook, Aug. 18. 

 P. MEDIA Walk. Long Pond, June 25-27. 

 P. sp. Long Pond, June 15. 



Alloperla Banks 



A, LATERALIS Bauks. Valley Cove, Breakneck Br., June 16. 



Canyon Brook, June 23-July 25 all (Alex.) Bar Harbor, 



June 15-July 20. 

 A. MEDiANA Banks. Bar Harbor, June 14. Echo Lake, June 



22. Breakneck Brook, June 16 and Canyon Brook, June 23 



(Alex.). 

 A. iMBECiLLA Say. Breakneck Br,, Duck Br. and Sea Wall 



Bog, June 16 (Alex.). 



Chloropekla Newman 



C. CYDIPPE NcAvn. Echo Lake, July 12. Duck Br., June 16. 



ISOPERLA. Banks 



L BiLiNEATA Say. Duck Brook; Breakneck Brook, June 16 



(Alexander). 

 I. MONTANA Banks. Bar Harbor, June 8. Duck Brook, June 



16, Breakneck Brook, June 16 (Alexander). 



Perlinella Banks 



P. DRYMO Newn. Jordan Pond, June 16. 



P. n.sp. Valley Cove, June 19 (Alexander). 



