VI THE SCOLYTID BEETLES. 



most, to a few closely allied genera. These parts will include synop- 

 tic tables, the necessary revisions of old descriptions of species and 

 genera, and descriptions of genera and species which appear to be 

 new to science. 



It is proposed to follow these technical contributions with parts of 

 a bulletin in the regular series, to include the determined bionomic 

 and economic facts. 



A somewhat comprehensive treatment of the anatomical details, 

 fully illustrated, is given in Part I of this technical bulletin in order 

 that it may serve as a basis for reference and comparison in the sub- 

 sequent treatment of the other genera and groups of the family. 



LABELS AND RECORDS OF TYPE AND OTHER MATERIAL. 



A single specimen (a female, if possible) is designated as the type 



of a described species by a printed red label (''Type No. , 



U.S.N.M."), with the type catalogue number of the U. S. National 

 Museum written in the blank. When additional specimens are avail- 

 able, the type, with one other specimen representing the opposite sex, 

 labeled " $ type" (or " $ type") on red label, without type number, 

 together with revision types " and other specimens showing range in 

 variation, constitute the type series which is deposited in the type 

 collection of the U. S. National Museum. Other paratypes and typ- 

 ical examples of revised descriptions, comprising one or more speci- 

 mens of each species described, are marked with small red labels, and 

 together with the duplicate collection of pinned, alcoholic, and bio- 

 logic material, are kept in the reference collection of the Branch of 

 Forest Insect Investigations, Bureau of Entomology, U. S. Depart- 

 ment of Agriculture. 



All pinned, alcoholic, and biologic material collected or received 

 from correspondents are referred to in the field or laboratory records 

 and bears number labels, each number referring to a consecutively 

 numbered record of the observations made at the time the specimens 

 were collected or received. 



Material collected by the writer during his connection with the 

 West Virginia Agricultural Experiment Station between 1890 and 

 1902 is designated by ''Hopk. W. Va.," number labels. Material 

 collected by the writer during his temporary employment on special 

 explorations and trips of investigation for the U. S. Department of 

 Agriculture between 1899 and July, 1902, as well as that collected 

 during the investigations of forest insects subsequent to April, 1902, 

 or received from correspondents, is distinguished by a "Hopk. U. S." 

 number label. In addition to the note number label each completely 



a The term "revision type" is used to designate the specimens, male and female, 

 on which a revised description is based. 



