THE HYMENOPTERA OF ESSEX
69
Colchester district, W. H. Harwood; Theydon Bois, 29.6.1958, A.
C. Wheeler.
Psithyrus vestalis (Geoffroy in Fourcroy, 1785). Parasitic on
B. terrestris. Colchester, 1899, W. H. Harwood; Skipper's Island,
Thorpe-le-Soken, 4.7.1958, A. C. Wheeler; Grays, 13.8.1960; and
Norsey Wood, Billericay, 30.7.1960.
ACKNOWLEDGMENTS
The author thanks Dr. I. H. H. Yarrow for checking some of
the identifications, and for permission to examine the Harwood's
collection in the British Museum (Natural History); Mr. K.
Marshall, Curator of the Passmore Edwards Museum, for permis-
sion to use the library and to examine the Cole-Fitch collection;
and Messrs. D. A. J.'Hunford, R. J. Knowles, C. B. Pratt, B. T.
Ward, and A. C. Wheeler for sending specimens.
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