INSECTS AFFECTING PARK AND WOODLAND TKEES 187 



louse may be seen within the cavity. This insect is the mother of the 

 colon)- inhabitin*^ the i^all. l-'onr to five weeks after the inception of its 

 growth ant! during- tlie nn)nth of June, an eNamination of the interior of the 

 gall shows the atlult phuit louse- surrounded by numerous youn^' in different 

 stages of growth. Within the gall, among the many occupants are small 

 glistening globules of a sweet licjuid or honeydew, excreted by the plant 

 lice. Later the opening into the gall spreads ajjart and permits the insects 

 to escape, and when the tree is badly infested, as stated by I)r Lintncr, 

 there are almost showers of honeydew falling from the leaves on the ground 

 beneath. The stones of the walks under the infested trees in cities may be 

 kept moist and black liy this copious excretion. The members of the 

 second generation, as stated b\" L)r Lintner, are wingless females, parents 

 of the gall-producing generation, from which, later in the season, sexual 

 individuals develop and deposit eggs in sheltered places beneath the bark. 

 The winter is passed in this stage and the stem mother appears the follow- 

 ing spring. 



Bibliography 



1859 Fitch, Asa. Ins. X. V. 5th Rep't, p. 63-64 



1887 Lintner, J. A. Ins. X. V. 3d Rep't. 1S86. p. 126-2S 



Woolly larch aphid 



CItcrnics strobilobiiis Kalt. 



Snow-white, wooly aphids or plant lice on larch needles in May and June and 

 masses of jjurplish eggs at the base of leaf fascicles mav be this insect. 



This species is somewhat common on the larches in Alban}', and has 

 been under the writer's observation for the past five years. It is occasion- 

 ally exceedingly abundant, and the woolly masses excreted by this plant 

 louse are sometimes so conspicuous as to give a tree the appearance of 

 having been dusted with Hour or starch. This was specially true the latter 

 part of June 1897 [vS>r pi. 18, fig. i, 3, 4] 



Life history. The life history of this insect as observed by the writer 

 in Albany is substantially as follows: May 3, 1897, the larches were alive 

 Avith females and etrafs. Largfe masses of esters were to be found at the 



