The Siricidae of North America 



J. CHESTER BRADLEY, PH. D. 

 ASSISTANT PROFESSOR OF SYSTEMATIC ENTOMOLOGY IN CORNELL 



UNIVERSITY' 



Over ten years ago the writer undertook to rearrange tlie eol- 

 lection of SirieidiT? and allied families belonging to Mr. E. T. 

 Cresson, then in the keeping of the American Entomological 

 Society, and whicli since then has been most generously pre- 

 sented to that society by Mr. Cresson. Since that time, during 

 the intervals of other duties, these insects have received a 

 greater or less degree of attention at his hands, and the i)aper 

 then liegun has been several times rewritten and extended. 



Unable to foresee the early completion and publication of the 

 entire work, and confronted with the expressed desire of cer- 

 tain workers in the field of llymenopterology that it should be 

 available to them at an early date, it has seemed best to present 

 a preliminary and brief account. 



Pending the completion and publication of the fuller work, 

 which is ])lanned to cover the families SiricidfP, Cephida?, 

 Megalodontidse, Oryssidse, and Xiphydriidffi, the author will be 

 grateful for the correction of errors, discrepancies or omissions 

 in the present paper, and especially for the loan of material in 

 any of the above groups, from any part of the world, which he 

 will be glad to identify. 



Acknowledgments are due to Professors J. H. Comstock, A. 

 D. MacGillivray, the late Dr. William H. Ashmead, Mr. S. A. 

 Rohwer, Dr. L. 0. Howard, and others, which will be expressed 

 in more detail when the fuller paper is published. I :nn in- 

 debted to my brother. Dr. B. W. Bradley, for assistance in the 

 determination of the derivation and grammatical form of the 

 technical names. 



Mr. S. A. Rohwer (1911b) has had the last word upon tlic 

 classification of the horn-tails and sawtlies (Chalastogastra). 

 While recognizing the weight of his views as therein expressed, 

 I have not been able in all cases to accept them. In 1113- o))iniou 



