SECOND FIELD MEETING. iS 
side, he had found Brachyopa bicolor, Chrysostoxum bicinctum, 
and C. arcuatum, Cheiloxa ruficornis, and Atheria Ibis. 
Mr. Bold described the habits of Anobiwm molle a species of death 
watch, which he had found in considerable numbers near New- 
castle. This paper will be found in its place in the Transactions. 
The rarer insects noticed during the excursion by Mr. Bold, 
were Gymnaetron niger, Apion subulatum, A. Spencit and A. 
striatum. In addition to these Mr. B. caught upwards of sixty 
species of beetles, the names of which will appear in the classi- 
fied list now preparing by Mr. Bold and Mr. Hardy. 
In addition to the Maiden Pink mentioned, the only plants 
worthy of particular notice are Aguilegia vulgaris, near Allans- 
ford ; Parietaria oficinalis, on the bridge at the same place ; 
Orobanche major, abundant ; and Fedia dentata, in the corn- 
fields ; also, Hchium vulgare, in great abundance by the Der- 
went, above Allansford. 
The Geological features of the district travelled over are, in 
the words of Mr. Hutton, “interesting, though simple. It is 
well known that in the North of England the carboniferous for- 
mation naturally separates itself into three divisions, the upper 
one characterised by an abundance of coal, the under one by a 
large development of limestone—these being usually designated 
the “coal measures,” and “the mountain limestone formation ;” 
between these a thick series of beds of coarse grit and slate are 
interposed, called the “millstone grit.” It was upon this interme- 
diate group almost entirely that the excursion was made. In de- 
scending the hill from Medomsley, or Conside, towards the Der- 
went, the outcrop of all the lower members of the coal formation 
is passed over, the lowest workable bed of coal, the ‘ Brockwell 
Seam,’ cropping out in the hill side, very little above the hotel 
at Shotley Bridge. Following the Derwent, as the party did, up- 
wards from Shotley Bridge, the whole thickness of the ‘ millstone 
grit’ (brought up by the rise of the strata) was passed over by 
the time the party had arrived at the Silver-tongue lead mine, 
where, in the bed of the Derwent, the first stratum of mountain 
limestone, called the “ Fell Top Limestone,” makes its appear- 
ance. The millstone grit possesses few characters of interest 
