X THE SCOLYTID BEETLES. 



Pago 

 Pia. 67, Dendroctonus monticolm: Egg galleries and larval mines grooved in 



surface of wood 108 



68. Dendroctonus monticolx: Distribution map 109 



69. Dendroctonus ponderosae: Egg galleries and larval mines 112 



70. Dendroctonus ponderosse: Tree with bark removed, showing egg 



galleries and marked on surface of wood 113 



71. Dendroctonus ponderosse: Distribution map 114 



72. Dendroctonus jeffreyi: Distribution map 116 



73. Dendroctonus simplex: Egg galleries and larval mines 119 



74. Dendroctonus simplex: Distribution map 120 



75. Dendroctonus pseudotsugse: Egg galleries and larval mines 122 



76. Dendroctonus pseudotsugx: Egg gallery and larval mines 123 



77. Dendroctonus pseudotsugie: Section of log with bark removed, show- 



ing brood galleries marked and gi'ooved on surface of wood 124 



78. Dendroctonus pseudotsugie: Distribution map 125 



79. Dendroctonus piceaperda: Egg gallery and larval mines 128 



80. Dendroctonus piceaperda: Distribution map 129 



81. Dendroctonus engelmanni: Egg gallery and eggs in living bark 132 



82. Dendroctonus engelmanni: Distribution map 133 



83. Dendroctonus borealis: Distribution map 134 



84. Dendroctonus obesus: Distribution map 137 



85. Dendroctonus rufipennis: Distribution map 140 



86. Dendroctonus murrayanx: Distribution map 141 



87. Dendroctonus punctatus: Distribution map 143 



88. Dendroctonus micans: Egg galleries and larval chamber 145 



89. Dendroctonus micans: Distribution map 146 



90. Dendroctonus terebrans: Distribution map 150 



91. Dendroctonus valens: Egg galleries and larval chamber 152 



92. Dendroctonus valens: Work in bark at base of stump 153 



93. Dendroctonus valens: Basal work in living tree resulting from primary 



injury by this species 154 



94. Dendroctonus valens: Distribution map 155 



95. Dendroctonus adjunctus: Distribution map 158 



96. The antenna in scolytoid beetles; Diagram and terminology 172 



97. Abnormalities in the antennal funicle of Xyleborus tachygraphus 173 



98. Ips emarginatus: Proventricular plate 183 



99. Scolytus scolytus: Proventricular plate 183 



100. Crossotarsus lecontei: Proventricular plate j . . . 183 



101. Dendroctonus valens: Membranous and nonchitinous elements of 



male reproductive organs 184 



102. Xyleborus saxeseni: Chitinous elements of male reproductive organs . . 184 



103. Ips emarginatus: Chitinous elements of male reproductive organs.. 185 



104. Pityophthorus BTp.: Chitinous elements of male reproductive organs. . 186 



105. Pityophthorus bellus: End plates and seminal rod of male reproductive 



organs 186 



106. Micracis suturalis: Posterior elements of male reproductive organs .. . 186 



107. Dendroctonus valens: Posterior elements of male reproductive organs. 187 



108. Scolytus rugulosus: Posterior elements of male reproductive organs. 189 



109. Scolytus quadrispinosus: Posterior elements of male reproductive 



organs 189 



110. Crossotarsus lecontei: Posterior elements of male reproductive 



organs 191 



111. Dendroctonus valens: Female reproductive organs 194 



112. Classification of galleries of Scolytoidea 205 



