16 BIOLOGICAL SURVEY OF 



In 1923, collecting was done in July. The lOtli was spent 

 at Bar Harbor; the 11th at Newport Cove, Great Head, in 

 company with Mr. H. B. Peirson. July 12th to 18th was spent 

 at the Mount Desert Biological Laboratory, Salisbury Cove; 

 the 15th, in company with Mr. C. E. Olsen, and the 17th, at 

 the Narrows through the kindness of Mr. Frank J. Myers. 

 July 19th and 20th was spent at Manset, Southwest Harbor. 



The island was not visited in 1924, but in July, 1925, I 

 again continued my work. The 22nd to 25th was spent at 

 Salisbury Cove, collecting on the "Heath" and "Meadow" 

 south of the town and as far west as the mouth of Northeast 

 Creek. The 26th to 29th was spent at Manset. 



From August 6 to 12, 1926, work was again confined to 

 the vicinity of Salisbury Cove. From August 26 to Septem- 

 ber 12, 1926, Dr. and Mrs. C. P. Alexander, of Amherst, Mas- 

 sachusetts, visited the island, stopping at Southwest Harbor. 

 Their collecting was confined largely to the southern end of 

 Echo Lake, Beach, and Western Mountains. They were very 

 successful and added many species to the list, especially in 

 the Tipulidae. 



Through the kindness of Mr. Dwight Blaney, I have exam- 

 ined a collection of insects he has made on Ironbound Island. 

 A few of these, not yet found on Mount Desert (but which 

 undoubtedly will be) have been added to the list. 



In making a collection from any given area, about one-half 

 of these species are found quite common, some are always rare, 

 while with others their time of appearing is limited or they 

 are local and can only be obtained by collecting at" all' seasons 

 and in all parts of the area for a number of years. Another 

 feature in the study of insects that should be considered is 

 that practically all determinations have to be made from the 

 adult or winged stage, and that each of these pass through at 

 least three other well-marked stages — egg, larva, and pupa — 

 while the larvae and nymphs of many, in each of their several 

 molts, often vary greatly in appearance. Thus, while there 

 are probably 5000 species on the island of Mount Desert, 

 these would be represented by over 30,000 quite distinct 



