XIV THE SCOLYTID BEETLES. 



Page. 

 Fig. 32. The European barkbeetle-destroyer ( Clerusformicarius): Adults, larva 



and details, pupa and details 71 



33. The Arizona pine beetle (Dendroctonus arizonicus) : Adult 72 



34. The Arizona pine beetle : Distribution map 73 



35. The smaller Mexican pine beetle (Dendroctonus mexicanus): Adult, 



section of egg galleries 74 



36. The smaller Mexican pine beetle: Distribution map 74 



37. The larger Mexican pine beetle (Dendroctonus parallelocollis): Adult . 76 



38. The larger Mexican pine beetle: Section of egg gallery 76 



39. The larger Mexican pine beetle: Distribution map 76 



40. The Colorado pine beetle (Dendroctonus approximatus) : Adult 78 



41. The Colorado pine beetle: Single egg gallery 78 



42. The Colorado pine beetle: Egg galleries 79 



43. The Colorado pine beetle: Distribution map 80 



44. The mountain pine beetle (Dendroctonus monticolx): Adult 81 



45. The mountain pine beetle: Egg galleries and larval mines in bark 82 



46. The mountain pine beetle: Egg galleries and larval mines grooved in 



surface of wood 83 



47. Silver or western white pine killed by the mountain pine beetle 85 



48. Two giant sugar-pine trees killed by the mountain pine beetle, and 



one dying from recent attack 86 



49. The mountain pine beetle: Tops of trees shown in figure 48 87 



50. The mountain pine beetle : Distribution map 89 



51. The Black Hills beetle (Dendroctonus ponderosx): Adult, larva, pupa. 91 



52. The Black Hills beetle: Egg galleries and larval mines 92 



53. The Black Hills beetle: Tree with bark removed, showing egg gal- 



leries grooved and marked on surface of wood 93 



54. The Black Hills beetle: Galleries in bark and marked on scoring chip. 94 



55. The Black Hills beetle: Pitch tubes.... 95 



56. Work of the Black Hills beetle in the Black Hills National Forest 96 



57. Removing bark from trunk of standing tree with special barking tool 



having handles of different lengths, to destroy broods of the Black 



Hills beetle 98 



58. Removing bark from base of trunk of standing tree with special bark- 



ing tool, to destroy broods of the Black Hills beetle 99 



59. The Black Hills beetle: Distribution map 100 



60. The Jeffrey pine beetle (Dendroctonus jeffreyi) : Adult 101 



61. The Jeffrey pine beetle: Distribution map 102 



62. The eastern larch beetle (Dendroctonus simplex Lee.) : Adult 103 



63. The eastern larch beetle : Egg galleries and larval mines 104 



64. The eastern larch beetle: Distribution map 106 



65. The Douglas fir beetle (Dendroctonus pseudotsugae) : Adult 107 



66. The Douglas fir beetle: Egg galleries and larval mines 109 



67 . The Douglas fir beetle : Egg gallery and larval mines 110 



68. The Douglas fir beetle: Section of log with bark removed, showing 



brood galleries marked and grooved on surface of wood Ill 



69. The Douglas fir beetle: Distribution map 113 



70. The eastern spruce beetle (Dendroctonus piceaperda): Adult, larva, 



pupa, details '. - 115 



71. The eastern spruce beetle: Egg gallery and larval mines 116 



72. Diagram illustrating the dormant and active periods in the develop- 



ment of the eastern spruce beetle 117 



73. The eastern spruce beetle: Old egg galleries and larval mines in bark. 118 



