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 contributions 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. Rohwer 
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, McL, is a parasite of Dicerca divaricata in 
Betula lenta and of unknown borers in Quercus bicolor and 
Quercus sp. Notes by PI. B. Kirk and J. N. Knull. 
Oleisoprister abbotii Westw., Hummelstown, Pa., reared from 
Liriodendron tulipifera infested by Leptura mutabilis. 
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 fulvoguttata was found in adult and 
pupal stages. In some cells adults and pupae (one to a cell) 
of 0 . bilobatus were found with remnants of the host. 
