XIV THE SCOLYTID BEETLES. 
Page. 
Fig. 32. The European barkbeetle-destroyer (Clerus formicarius): 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 monticolse): 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 pseudotsugse) : 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 
