THE GENUS PISSODES. 41 



Section a'l. 



New Hampshire Species 18 



New Hampshire Species 19 



High mountains of West Virginia Species 20 



Northeastern Oregon Species 21 



Black Hills, South Dakota, and central Colorado Species 22 



Koyukuk River, Alaska, lat. 67° 69', long. 151° Species 23 



Northern Michigan Species 24 



Colorado and Utah Species 25 



Mount Rainier, Washington Species 26 



Maine to Northern Michigan Species 27 



Higher mountains of North Carolina Species 28 



DIVISION II. 



New Hampshire to northern Pennsylvania, westward into Minnesota Species 29 



Kaslo, British Columbia Species 30 



TABLE SHOWING RELATIONS OF SPECIES TO HOST TREES. 



Pissodes Hosts, etc. 



species 

 numbers 



1. Abies balsamea and A. fraseri. Dying bark on branches and witch's l)r(>om. 



2. Abies? (Not observed.) 



3. Picea sitchensis? (Not observed.) 



4. Picea sitchensis. Living bark of terminals and tops of young trees, causing serious 



injury. 



5. Picea engelmanni . Living bark of terminals and tops of young trees, causing 



serious injury. 



6. Pinus strobus, common-., Pinus rig ida. r&re; Pimts divaricata. rare; Picea rubens, 



frequent; Picea e.rcelsa, frequent. Living terminals of saplings and small 

 trees, causing serious damage to white pine. 



7. Pinus strobus, Piniis rigida, Pinits echinata, Pinus resinosa. Pinus virginiana, and 



Pinus pungens. Ijiving and dying thick and thin bark on base and trunks of 

 standing and felled trees, stumps, and base and stems of saplings. Injurious 

 to the last. 



8. Pinus ponderosa and Pinus scopulorum. Living and dying bark on base, stems, 



tops (?), and terminals of saplings. 



9. Pinus? (Not observed.) 



10. Pinus palustris. Pinus tnda, Pinus virginiana, and Pinits echinata. Living and 



dying thick bark on standing and felled trees, stumps, and base and stems of 

 saplings. 



11. Cedrus deodara. Living branches, tops, and terminals, causing serious injury. 



12. Pinus ponderosa. Living thick bark on trunks of small trees, evidently causing 



scars. 



13. Pinus ponderosa and Pinus lambertiana. Living and dying thick bark on stand- 



ing and felled trees and stumps and on base and stems of saplings. 



14. Pinus strobiformis. Pinus scopulorum, and Pinus contorta (murrayana). Living (?) 



and dying bark on base and stems of saplings and of standing and felled trees. 



15. Pinus radiata and Pinus .lylvestris. Thick and dying bark on standing and felled 



trees and stumps and on base, stems, tops, and tops of saplings. 



16. Pseudotsuga taxifolia. Living and dying thick bark on standing and felled trees 



and stumps and on base and stems of saplings, causing serious injury to saplings. 



17. Picea sitchensis. Living and dying thick bark ou standing girdled trees and stumps 



of felled ones. 



