ILLUSTRATIONS. 



PLATES . 



Page. 

 Plate IX. Figs. 1-18. — Typical targi and tibiae of the subfamilies of Scoly- 



toidea 170 



X. Figs. l-5a. — Antennae of tyx^ical si^ecies of the subfamilies of Scoly- 



toidea 170 



XI. Figs. 7-lOa. — Antennae of tj^Dical species of the subfamilies of 



Scolytoidea 170 



XII. Figs. 12-lSb. — Antennae of typical species of the subfamilies of 



Scolytoidea 170 



XIII. Figs. l-9b. — Tibiae and tarsi of typical species of the subfamilies of 



Scolytoidea 178 



XIV. Figs. 10-lOb. — Tibiae and tarsi of typical species of the subfamilies 



of Scolytoidea 178 



XV. Figs. 12-15b. — Tibiae and tarsi of typical species of the subfamilies 



of Scolytoidea 178 



XVI. Figs. 16-18b. — Tibiae and tarsi of tyi3ical species of the subfamilies 



of Scolytoidea 178 



TEXT FIGURES. 



Fig. 9fi. The antenna in scolytoid beetles: Diagram and terminology 172 



97. Abnormalities in the antennal funicle of Xylehorus tachygraphus 173 



98. Ips emarginatus: Proventricular plate 183 



99. Scolytus scolytus: Proventricular plate 183 



100. Crossotarsus lecontei: Proventricular plate 183 



101. Dendroctonus valens: Membranous and nonchitinous elements of male 



reproductive organs -. 184 



102. Xylehorus saxeseni: Chi tinous elements of male reproductive organs. . 184 



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



104. Pityophthorus sp.: 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 



VI 



