THE GENUS DENDEOCTONUS. 



79 



DIVISION II. 



Section a,3. 



Species 12. Larix laricina. 



Species 13. Larix occidentalis; Pseudoisuga taxifolia and macrocarpa. 



Species 14. Picea mariana, rubens, canadensis. 



Species 15. Picea canadensis and engelmanni. 



Species 16. Picea canadensis. 



Species 17. Picea sitchensis. 



Subsection b4. 



Species 18. Pinus strobus. 



Species 19. Pinus murrayana; Picea engelmanni. 



Species 20. Picea rubens. 



Species 21. Pinus, Picea, Abies?, Larix. 



Subdivision D. 



Species 22. Pinu^ strobus, tieda, rigida, serolina, echinata, palustris. 



Species 23. Pinus strobus, monticola, lambertiana, strobifonnis, ponderosa, scopulorum, 



jeffreyi, chihuahuana, murrayana, radiata, rigida, cirginiana; Larix laricina; 



Picea rubens, canadensis, excelsa. 



TABLE OF HOST TREES. 



Dendroctonus spe- 

 cies number. 



Pinus strobus 4, 18, 22, 23. 



monticola 9,23. 



lambertiana 1,9,11,23. 



fiexilis 10. 



strobiformis 10, 23. 



edulis 2,23. 



arizonica 8, 23. 



ponderosa 1,9,11,23. 



scopulorum 2, 3, 5, 8, 10, 23. 



jeffreyi 11,23,. 



chihuahuana 3, 8, 23. 



murrayana 9, 10, 19, 23. 



radiata 23. 



tceda 4, 22. 



rigida 4,22,23. 



serotina 22. 



virginiana 4,23. 



pungens 4. 



Dendroctonus spe- 

 cies number. 



Pinus echinata 4, 22. 



glabra 4. 



palustris 4,22. 



sylvestris 23. 



teocotl 6,7. 



lejophiUa 6,7. 



ayacahuite 6,7. 



Larix laricina 12, 23. 



occidentalis 13. 



Picea mariana 14. 



rubens 4, 14, 20, 22, 23. 



canadensis. '. 14, 15, 16, 23. 



engelmanni 9, 10, 15, 19. 



sitchensis 17. 



excelsa 4, 23. 



Pseudotsuga taxifolia 2, 13. 



maa'ocarpa. . 13. 



REVISION AND SYSTEMATIC NOTES, WITH DESCRIPTIONS OF 



NEW SPECIES. 



DISTINCTIVE GENERIC CHARACTERS. 



Adult (figs. 1, 2, 3). — Antennal funiculus 5-jointed; club broad, 

 thickened at base,, compressed toward apex, and usually with 4 dis- 

 tinct segments, the sutures curved or nearly straight; tarsi with joint 

 3 bilobed; tibia with inner angle produced and armed with a single 

 tooth; outer angle oblique and armed with 3 or more stout teeth; 

 distinct dorsal impression toward apex for the retractile tarsus. 



