ATTACKING THE BRANCHES. 195 



have remained uninjured while all around them have suffei'ed 

 from the borer. 



No. 98.— The Elm-bark Beetle. 

 Phlceotribus liminaris (Harris). 



This insect is very common on elm-trees ; it also occasion- 

 ally attacks the peach-tree, especially when from any cause it 

 has becofiie diseased. In August or September there appear 

 small perforations like pin-holes in the bark, from which issue 

 minute cylindrical beetles about one-tenth of an inch long, of 

 a dark-brown color, with the wing-cases deeply impressed with 

 punctated furrows, and covered with short hairs ; the thorax 

 is also punctated. This species has never occurred on the 

 peach in sufficient numbers to attract general attention, or to 

 require the adoption of any special remedies. 



ATTACKING THE BEANOHES. 



No. 99. — The Peach-tree Bark-louse. 



Lecanium perskoi (Fabr. ). 



This is an insect very similar in appearance and habits to 

 the pear-tree bark-louse. No. 69. It is found attached to the 

 smooth bark of the peach twigs, frequently beside a bud or 

 at the base of a twig, appearing as a black hemispherical shell 

 about the size and shape of a split pea ; its surface is uneven, 

 shining, commonly showing a pale margin, and a stripe upon 

 the middle. It feeds upon the sap, piercing the bark with 

 its proboscis, and imbibing the juices. When mature, the 

 removal of the scale discloses a multitude of eggs, which in 

 due time hatch, and the young larvae scatter over the twigs, 

 and, fastening themselves to the bark, become permanently 

 located, and live the full terra of their lives without changing 

 their position. 



