1922] Records of Hymenopterous Parasites in Pennsylvania. 95 



RECORDS OF HYMENOPTEROUS PARASITES IN 

 PENNSYLVANIA 



By a. B. Champlain, 



Bureau of Plant Industry, Harrisburg, Pa. 



Definite breeding records of Hymenopterous parasites are 

 a' ways valuable contril;)utions to our knowledge of this order of 

 insects. The following collection of fragmentary records of 

 parasitic Hymenoptera and their hosts are from rearings by the 

 author, and from notes in the file of the Bureau of Plant Industry, 

 extending over a period of years. Due credit for the records 

 obtained appears throughout the paper. 



The recorded species which are in the collection of the 

 Pennsylvania Bureau of Plant Industry were all identified or 

 verified by leading authorities on Hymenoptera, — S. A. Roliwer 

 and R. A. Cushman of the U. S. National Museum, and some by 

 H. L. Viereck of the U. S. Bureau of Biological Survey. The 

 abbreviations — Det. Roh., Det. Cush., Det. Vier. — designate^ 

 the species identified by each. 



Evaniidce 



Hemistephanus sp. (Det. Cush.). Hummelstown, Pa., Rockville, 

 Pa., Magnolia, Md., is a parasite of Dicerca divaricata in 

 Betula lenta and of unknown borers in Quercus hicolor and 

 Quercus sp. Notes by H. B. Kirk and J. N. Knull. 



Oleisoprister abbotii Westw., Hummelstown, Pa., reared from 

 Liriodendron tidipifera infested by Leptura mutabiUs. 



Odontaulacus bilobatus (Prov.), (Det. Roh.) Mt. Holly, Pa., 

 June 14, 1921 — Knull and Champlain. Adults were 

 flying around and alighting on dying hemlock Tsuga 

 canadensis. Upon cutting into the bark a heavy infesta- 

 tion of Melanophila fidvoguttata was found in adult and 

 pupal stages. In some cells adults and pupse (one to a cell) 

 of 0. bilobatus were found with remnants of the host. 



