LIST OF ILLUSTRATIONS. 



XV11 



84. Markings of Scolytus de- 



structor in bark of Eng- 

 lish elm 



85. Showing exit-holes of same 



86. Scolytus destructor . 



87. Markings of Scolytus pruni 



in branch of apple 



88. Markings of Scolytus multi- 



striatus in bark of elm . 



89. Markings of Scolytus intri- 



catus on oak pole 



90. Scolytus intricatus . 



91. Markings of Hylastespalli- 



atus .... 



92. Hylastes pcdliatus . 



93. Markings of Hylesinus 



crenatus 



94. Hylesinus crenatus . 



95. Markings of Hylesinus 



fraxini 



96. Hylesinus fraxini 



97. Markings of Hylesinus 



oleiperda 



98. Hylesinus oleiperda . 



99. Markings of Hylesinus 



rittatus 



100. Hylesinus vittatus . 



101. Shoot of Scots pine show- 



ing the entrance-hole 

 and boring of a pine 

 beetle .... 



102. Showing mother and larval 



galleries in process of 

 formation 



103. Portion of bark of Scots 



pine, showing two 

 mother - galleries and 

 larval workings of pine 

 beetle .... 



104. Hylurgus piniperda 



105. Markings of Phbvophthorus 



rhododactylus on gorse . 



106. Markings of Phbeophthorus 



rhododactylus on broom 



107. Phbvophthorus rhododac- 



tylus .... 



108. Markings of Cryphalus 



abietis 



109. Cryphalus abietis 



110. Showing "exit-holes" of 



Cryphalus tilice . 



111. Markings of Cryphalus 



tili<e on lime 



112. Markings of Cryphalus fagi 



