XII 



THE SCOLYTID BEETLES. 



Page. 

 Fig. 25. Dendroctoniis valens: Abdominal stemites, ventral and lateral as- 

 pects 38 



26. Dendroctoniis valens: Tibia, tarsus, articulation, etc 40 



27. Dendroctonus: Left tibiae, dorsal and ventral aspects 41 



28. Dendroctonus: Left tibiae, dorsal and ventral aspects 42 



29. Dendroctonus: Left tibiae, dorsal and ventral aspects 43 



30. Dendroctoniis valens: Diagram of basal area of hind wing 44 



31. Dendroctonus valens: Right elytron, ventral aspect 45 



32. Dendroctonus valens: Basal process of right elytron 46 



33. Dendroctonus valens: Declivital section of elytra 46 



34. Dendroctonus valens: Diagram of elytron, showing stria^, interspaces, 



and tracheae 47 



35. Dendroctonus valens: Digestive organs of adult 52 



36. Dendroctonus valens: Fore intestine, showing details 53 



37. Dendroctonus valens: Pupa, dorsal, lateral, and ventral aspects 54 



38. Dendroctonus valens: Pupa, lateral and anal aspects 55 



39. Dendroctonus valens: Larva, dorsal, lateral, and ventral aspects 58 



'40. Dendroctonus valens: Head of larva 59 



41. Dendroctonus valens: Mouthparts of larva 60 



42. Dendroctonus valens: Mandibles of larva 63 



43. Dendroctonus valens: Digestive organs of larva 65 



44. Dendroctonus brevicomis: Egg galleries 82 



45. Dendroctonus brevicomis: Bark showing pupal cells, exit burrows, and 



pitch tubes 83 



- 46. Dendroctonus brevicomis: Distribution map 84 



47. Dendroctonus barberi: Egg galleries 86 



48. Dendroctonus barberi: Distribution map 87 



49. Dendroctonus convexi/rons: Egg galleries and larval mines 89 



50. Dendroctonus convexi/rons: Distribution map 90 



51. Dendroctonus frontalis: Egg galleries and larval mines 91 



52. Dendroctonus frontalis: Termination of egg galleries 92 



53. Dendroctonus frontalis: Beginning of egg galleries 92 



54. Dendroctonus frontalis: Bark showing pitch tubes, etc 92 



55. Dendroctonus frontalis: Old egg galleries in living tree 93 



56. Dendroctonus frontalis: Egg gallery in living tree, the resulting wound 



in process of healing 93 



57. Dendroctonus frontalis: Distribution map 94 



58. Dendroctonus arizonicus: Distribution map 97 



59. Dendroctonus mexicanus: Section of egg galleries 98 



60. Dendroctonus mexicanus: Distribution map 99 



61. Dendroctonus parallelocollis: Section of egg gallery 100 



62. Dendroctonus parallelocollis Distribution map 101 



63. Dendroctonus approximatus: Single egg gallery 102 



64. Dendroctonus approxiynatus: Egg galleries 103 



65. Dendroctonus approximatus: Distribution map 104 



66. Dendroctonus monticolae: Egg galleries and larval mines in bark 107 



67. Dendroctonus monticolse: Egg galleries and larval mines grooved in sur- 



face of wood 108 



68. Dendroctonus monticolx: Distribution map 109 



69. Dendroctonus ponderosae: Egg galleries and larval mines 112 



70. Dendroctonus ponderosae: Tree with bark removed, showing egg gal- 



leries grooved and marked on surface of wood 113 



71. Dendroctonus ponderosn': Distribution map 114 



