PREFACE. VII 



labeled mounted specimen bears labels which supply the following 

 data: Collector or correspondent, locality, collecting or rearing date, 

 host, and sex. The numbered notes are permanently bound in vol- 

 umes of 1,000 numbers, each note relating to one or more species and 

 to one or more specimens. The ''Hopk. W. Va." numbers begin with 

 1 and were hmited in June, 1902, to 7,791, and in January, 1907, to 

 7,793. The "Hopk. U. S." numbers began with 1 in April, 1899, and 

 will be hmited to the period during which the writer is in charge of 

 the Branch of Forest Insect Investigations in the Bureau of Ento- 

 mology. 



MATERIAL STUDIED. 



Unless otherwise mentioned, the material which forms the basis of 

 information and study, so far as it relates to matter in tliis bulletin, 

 is that bearing the "Hopk. U. S." or "Hopk. W. Va." note numbers. 

 The former is in the forest insect collection of the Bureau of Ento- 

 mology, U. S. Department of Agriculture; the latter belongs to the 

 collection of the West Virginia Agricultural Experiment Station, but 

 at present is in charge of the author, and forms a distinct part of the 

 forest insect collection of the Bureau of Entomology. 



ABBREVIATIONS. 



The abbreviations adopted in tliis pubhcation in referring to mate- 

 rial in the different collections examined and that identified by the 

 writer are as follows: 



D. A. — Division and Bureau of Entomology, U. S. Department of Agriculture, 

 Washington, D. C, other than Hopk. U. S. 



Hopk. U. S. — Branch of Forest Insect Investigations, Bureau of Entomology, U. S. 

 Department of Agriculture, Washington, D. C. 



Hopk. W. Va. — W. Va. Agricultural Experiment Station, Morgantown, W. Va. 



U. S. N. M. — TJ. S. National Museum, Washington, D. C. 



H. & S. — H. G. Hubbard and E. A. Schwarz collection in the U. S. National Museum. 



B. & S.— Collected by H. S. Barber and E. A. Scliwarz for the U. S. National 

 Museum. 



Soltau. — H. Soltau collection in the U. S. National Museum. 



Lee. — Le Conte collection. Museum of Comparative Zoology, Cambridge, Mass. 



Horn. — Horn collection, American Entomological Society, Philadelphia, Pa. 



A. E. S. — American Entomological Society, Philadelphia, Pa. 



A. M. N. H. — American Museum of Natural History, New York, N. Y. 



N. Y. S. M.— New York State Museum, Albany, N. Y. 



Harris. — Harris collection, Boston Society of Natural History, Boston, Mass. 



Fitch. — Asa Fitch collection, as represented in the U. S. National Museum. 



Wickham. — Wickham collection of Scolytidse in the U. S. National Museum. 



ACKNOWLEDGMENTS . 



The writer desires to acknowledge the indispensable assistance and 

 encouragement, during his earUer studies of the scolytid beetle-s 



