The Siricide 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 the col- 
lection of Siricide and allied families belonging to Mr. E. T. 
Cresson, then in the keeping of the American Entomological 
Society, and which 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 paper 
then begun 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 Hymenopterology 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 planned to cover the families Siricide, Cephide, 
Megalodontide, Orysside, and Xiphydriide, the author will be 
grateful for the correction of errors, discrepancies or omissious 
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. O. Howard, and others, which will be expressed 
in more detail when the fuller paper is published. I am 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 the 
classification of the horn-tails and sawflies (Chalastogastra). 
While recognizing the weight of his views as therein expressed, 
I have not been able in all cases to accept them. In my opinion 
