INSECTS AFFECTING PARK AND WOODLAND TREES 



183 



the cocoons were to be seen on the t-'unk. forminij masses which could be 

 detected at a distance of several hundred feet. The leaves of the lower 

 branches were badly injured by the females, and examination in 1902 

 showed that many of the lower I 'inches had been killed. The insect was 

 breeding rapidly Aug. 6, 1901, at which time many young were observed 

 on the leaves. Partly grown 

 individuals were assembled in 

 long rows on both sides of the 

 principal veins on the under 

 surface of the leaves, and a 

 marked subacid, not unpleas- 

 ant odor was observed in con- 

 nection with this species. 



Early history. This spe- 

 cies was first noticed in 

 America by Miss Emih' A. 

 Smith of Peoria 111. in 1S80. 

 Miss Smith made a thorough 

 study of the insect and 

 observed it onl\- on the sugar or 

 hard maple, and referred it to 

 Goeffro)'s P s e u d o c o c c u s 

 a c e r i s. That reference was 

 allowed to stand till 1902, 

 when it was described by Mr 

 G. B. King. This scale insect 

 must have been quite abundant in Illinois in 1880. It was not noticed 

 again till 1894, when Dr L. O. Howard gave a summarized account of 

 its life history and commcMited on its rarity. He states that since the 

 publication of Miss Smith's article in 1880 and the preparation of his 

 account 14 years later, the species had not been sent to the division of 

 entomology. United .States Department of Agriculture, a fact which estab- 



Fig. 28 Plien.icoccus 

 /■-young females and ma 

 Insect Life. 1894. 7:235! 



