222
THE ESSEX NATURALIST.
EXPLANATION OF THE PLATES.
Plate IX. Dytiscus marginalis L.
Fig. 1. Pupa in cell in normal resting position.
Fig. 2. Pupa turned over on being disturbed, showing ventral
surface. Cast larval skin seen applied to the upper part
of the cell.
Fig. 3. Female beetle ready to escape from the cell.
Fig. 4. Glass tank with shallow dish for rearing the larva and shelf
and bank of earth for observing its method of digging in for
pupation.
The cell shown was found in the bank of a pond in Epping Forest and
was exhibited at the meeting of the Club on 27th January, 1917, and is in
the collection in the Club's Museum (Essex Naturalist, xviii., 186).
Plate X. Hydrous piceus L.
Fig. 1. Larva in cell awaiting pupation.
Fig. 2. Pupa in cell in normal resting position shortly before dis-
closure of imago.
Fig. 3. Freshly disclosed pupa in a cell opened up to exhibit its
form and method of resting.
All figures natural size, except Plate IX., fig. 4, which is x about 1/4.
THE HISTORY OF MYCOLOGY IN ESSEX.
By J. RAMSBOTTOM, O.B.E., M.A., Sec. L.S., Keeper of Botany, British Museum
(Natural History).
Continued from p. 178.
TAB. LXVIII.
Agaricus tigrinus. Bull. t. 70. [Lentinus.]
I Have been favoured with recent specimens of this pretty
species by Thomas Walford, Esq. of Birdbrook in Essex, who
gathered them from an ash in his plantations in September
last. Some were found growing from the sides, somewhat
horizontally, others near the root, upright, in clusters or single.
When fresh they are very tender and easily lacerated; when
dry coriaceous, and the stipes is of a very solid and firm texture.
I have specimens which accord so well with Schaeffer's Agaricus
tubaeformis, tab. 248 and 249, that I think them varieties of
this species. The tigrinus in the latter state has serrated gills,
and much resembles A. squamosus.
TAB. XCVIII.
Agaricus mollis. Dicks. Crpyt. fasc. I. p. 17. Schaeff. 213.
[Crepidotus.]
Found on an elm trunk near Stapleford Abbot, Essex.