244 THE SCOLYTID BEEIT.ES. 



Pinus radiata — Page. 



host of Dendroctonus 79 



host of Dendroctomis valens 156 



PiniLS rigida — 



host of Dendroctonus 79 



host of Dendroctonus frontalis 95 



host of Dendroctonus terebrans 150 



host of Dendroctonus valens 156 



Pinus scopulorum, host of Dendroctonus 79 



Pinus serotina — 



host of Dendroctomis 79 



host of Dendroctonus terebrans 150 



Pinus sp. , host of Dendroctonus valens 156 



Pinus strobiformis — 



host of Dendroctonus 79 



host of Dendroctonus ponderosx 113 



host of Dendroctoniis valens 156 



Pinus strobus — 



host of Dendroctonus 79 



host of Dendroctonus frontalis 95 



host of Dendroctonus rufipennis 140 



host of Dendroctonus terebrans 150 



host of Dendroctonus valens 156 



Pinus sylvestris — 



host of Dendroctonus 79 



host of Dendroctonus valens 156 



Pinus tseda — 



host of Dendroctonus 79 



host of Dendroctonus frontalis 95 



host of Dendroctonus terebrans 150 



Piyius teocotl — 



host of Dendroctonus 79 



host of Dendroctonus mexicanus 98 



Pinus teocotl (?), host of Dendroctonus parallelocollis 101 



Pinus virginiana — 



host of Dendroctonus 79 



host of Dendroctonus frontalis 95 



host of Dendroctonus valens 156 



Pissodes — 



abdominal sternites 182 



reproductive organs 188 



Pissodes strobi, comparison of head with Dendroctonus 11 



Pityogenes — 



armature 176 



connecting galleries 203 



host plants 209 



social habits 200 



Pityophthorus — 



antennal club 173 



connecting galleries 203 



nuptial chamber 202 



reproductive organs 190, 195 



Platypodidse, in key to families 224 



Platypodinse, in key to subfamilies 225 



