186 Maine Agricultural Experiment Station. 1918. 



the trunks. They come out from their winter quarters in early 

 June,, just as the elm buds are opening. The adults are not very 

 active early in the season, and usually crawl back under the 

 bark for protection during the night. In 1917, the writer found 

 a few pairs on June 2. and by June 5, they were pairing com- 

 monly. 



The earliest date on which the writer has found eggs in 

 Maine is June 7 (191 J ) and eggs were not common until late 

 in the month. Many beetles may be found pairing in late June 

 and early July, but the latest date on which eggs have been 

 deposited in the laboratory is July 15 (1917). 



The earliest date on which the writer has found larvae is 

 June 25 (1918), but a very few perhaps hatch slightly earlier. 

 Most of the larvae are in the first instar in early July, with 

 a few in the second instar ; in mid-July, the great bulk are in 

 the second instar. and a few in the early third ; while later in 

 the month, the great majority are in the third instar; although 

 first instar larvae may still be found occasionally even as late 

 as early August. 



Most of the overwintering adults are dead by mid-July and 

 the latest date to which one lived in the laboratory is August 

 10 (1916). The adults of the new generation begin to appear 

 in late July ( the earliest date on which one emerged in the lab- 

 oratory was July 30, ( 1916). and are common by the tenth of 

 August. They feed freely on the leaves during the rest of the 

 summer and early fall, entering into hibernation at the approach 

 of cold weather. 



There is only one generation each year in Maine, although 

 egg laying covers a very long period of time. 



Distribution. 



The elm flea-beetle is common in Connecticut. The writer 

 has also seen specimens collected in Pennsylvania by Professor 

 Robert Matheson of Cornell University. 



In Maine, the writer has noticed this species only in sev- 

 eral localities and doubtless it is widely distributed through 

 the state. 



