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MMi 161326 
40 l (e^j C, . fx S | L 
Vol. XIX —Part III ] [MARCH 1920—SEPT. 1920. 
The 
Essex Naturalist: 
being THE JOURNAL ge t,,. 
ESSEX FIELD CLUB. 
Edited by PERCY THOMPSON, F.L.S., Honorary Secretary, 
assisted by 
HENRY WHITEHEAD, B.Sc. 
Content*. paoh 
Some Field Observations on Essex Reptiles and Amphibians. By 
Fred J. Stubbs .. .. .. .. ... .. .. ..145 
The British Yellow Wagtails. By Miss Gulielma Lister, F.L.S... 152 
Recent Discovery of a Dene hole at Grays. By Percy Thompson, 
F.L.S. {with one Illustration) .. .. .. .. .. .. 154 
On Conifers Grown in Suburban Gardens : A Presidential Address. 
By Miss Gulielma Lister, F.L.S. {with tico Plates) .. .. .. 157 
On Insects Sucking the Sap of Trees. By Charles Nicholson, 
f. It. S. .. .« .. ., .. .. .. .« 17 o 
Notes on a Hornet’s Nest from Chignal St. James. By Charles 
Nicholson, F.E.S. .. .. .. .. .. .. .. .. 172 
FIotes .. .. .. .. .. .. .. .. .. 1 j 1, 1 1 3 
The Essex Field Club: Reports of Meetings, 25th October 1919, 
to 27th March 1920 .. .. .. .. .. .. .. 174 
British Oysters: Past and Present. By Alfred Bell .. .. 183 
The Authors alone are responsible for the Statements and Opinions contained in 
their respective Papers. 
STRATFORD, ESSEX : 
PUBLISHED BY THE CLUB, AT THE ESSEX MUSEUM OF 
NATURAL HISTORY. 
Editorial communications to Pf.rcy Thompson, Essex Museum, Romford Road, 
Stratford, and Advertisements to Messrs. Renham and Company, Limitkd, 
Printers, Colchester. 
Published Sept. 1920 ] 
Price, to Non-Member*. 7/6. 
