72 



THE REPORT OF THE 



No. 19 



July 4, 1897. 

 July 14, 1897. 



July 22, 1897. 



July 28, 1897. 



July 31, 1897. 

 August 17, 1897. 

 May 22, 1898. 

 May 29, 1898. 



June 6, 1898. 

 June 15, 1898. 

 June 27, 1898. 

 July 5, 1898. 

 July 10, 1898. 



July 16, 1898. 

 July 30, 1898. 



September 15, 1898. 

 September 21, 1898. 



April 5, 1899. 



May 10, 1899. 



Many small beetles {Ips fasciatus and its allies) abundant in filth which 



oozes from the burrows. 

 From the middle of June to the middle of July sap flows freely from exits 



of burrows. Pupa always headed towards exit. Large infested branches 



wilt and die. 

 In infested branches taken June 30th, beetles are m-^tured to-day. I split 



open branches every day from June 30th on, and found nearly all the 



larvae pupated July 3rd and 4th. Eighteen days will pretty closely 



cover the length of pupal stage. 

 Plenty of beetles in the infested sticks and only one pupa found. But 



few of the beetles have emerged from the burrows as yet. 

 Beetles emerging freely. 



Beetles common. Feeding on petioles and poplar leaves. 

 Captured one imago at Medford. Probably an over-wintered specimen. 

 Found plenty of larvae in native willows at Medford. This shows that 



the insect breeds in our woodlands 

 Larvae are feeding rapidly and throwing out worm-dust from their burrows. 

 Larvae boring in Populus monilifera, at Bedford, Massachusetts. 

 Larvae nearly full grown. 

 Beetles mating at Medford. 

 Larvae beginning to pupate, the date being later than last year. The 



small larvae hibernate in the cambium, enter the wood in the spring, 



and make a rapid growth to maturity. The base of young trees is a 



favorite point of attack ; older trees are more difficult to afl'ect. 

 Found larvae boring in silver poplar {Boliana poplar). 

 Beetles abundant at Springfield, Massachusetts, along the Connecticut 



River ; feeding on the cotton wood. 

 Imagoes mating at Maiden. 

 Beetles abundant and feeding on petioles and youncr ^wigs, at Winthrop, 



Massachusetts. 

 Found minute larvae under leaf scars in poplars at Abington, Massachu- 

 setts. Larvae j^th of an inch long, curved, pale greenish, and only 



slightly active. 

 Young larvae abundant in bark beneath leaf scars on poplars at Winthrop. 



Burrows about one inch long now mainly in the bark, and full of black 



castings. 



May 18, 1899. Larvae now entering the wood, having finished feeding in the bark. 



June 4, 1899. Larvae 7 to 10 mm. long and feeding rapidly. 



October 2, 1899. Found eggs of this insect for the first time, in poplars, at Wyman's 



Nurseries at Abington. They were wedged in under the bark in 

 cavities at the base of young branches. The beetle gouges out a hole 

 for each egg, and leaves from one to four in a spot. In some of the 

 infested sticks the eggs have hatched and the tiny larvae have com- 

 menced feeding. This finding of the eggs closes the gap in the life 

 history of the insect. 



Unless there are adults in spring, which, as in Europe, deposit eggs in May, and 

 Mr. Kirkland overlooked these, which is hardly possible, he has given the full life history, 

 for the first time. It is possible Ihat the single annual brood is not, as seems to be the case in 

 Europe, intercepted by winter. Certain it was that the insect was pairing at Buflfalo, N.Y., 



