INSECTS AFFECTING PARK AND WOODLAND TREES 317 



about y.2 inch in diameter, and of white silk. . The caterpillar is curled 

 up within. 



The yellowish brown cocoon is about >8 inch lon^;, with a number of 

 well marked ridges and is attached to any convenient object, such as 

 bark and leaves. 



Life history and habits. Little is known concerning the life history 

 and habits of this insect. The eggs of the moth and the mining operations 

 of the larvae have not been observed. The larvae occur the latter part of 

 August or in early .September, feeding on the soft parenchyma of the leaf 

 and" skeletonizing it thoroughly. At this time, small oval whitish, circular 

 cocoons may be observed here and there on the leaves. These are spun as 

 shelters during a molt. The true cocoons are interesting, brownish yellow, 

 ribbed structures about V, inch in length. These latter may be so abun- 

 dant as to give color to portions of infested leaves. They are spun 

 during the latter part of September, and the insect passes the winter 



within. 



Distribution. This insect has been recorded from Canada. New Eng- 

 land States, New York, and as stated by Dr Lintner, it will undoubtedly 

 be found to have a wide distribution. 



Bibliography 

 1890 Packard, A. S. U. S. Ent. Com. 5th Rci/t, ].. 507-8 

 1892 Fletcher, James. Central Experimental Farms (Canada), Rep't, p. 14-16 



1892 Packard, A. S. Insect Life. 5 : 14-16 



1893 Lintner, J. A. Ins. N, V. 8th Rep't. 189.. p. .33-40 



Cottonwood leaf beetle 

 Mclasonia scripta Fabr. 

 Yellowish beetles, about ■. uu h in length, variably marked with elongateci black 

 spots or blackish grubs about ^A mch in length, frequently defoliate willows and poplars, 

 specially in the Western States. 



This insect is a well known pest of willow, cottonwood and poplar 

 in the Western States, where it occasions very serious injury at times, 



