Y.N.U. Exhibition at the British Association . 361 
Section D (Entomology) : — 
(a) Yorkshire Coleoptera Committee . — Exhibits (1 ) North Yorkshire 
Coleoptera, by M. L. Thompson. This exhibit emphasized the sub-alpine 
character of the beetle fauna of the extensive moorland tracts of North 
Yorkshire. Specimens of coleoptera peculiar to the coast line were also 
shown. (2) Trogoderma Khapra Arrow, a Grain Pest (an addition to 
the British list of breeding Coleoptera), by F. A. Mason, Leeds. 
(b) Hymenoptera, Diptera and Hcmipter a Committee . — Exhibits: 
(1) ‘ Cuckoo ’ Humble-Bees and their Hosts, by A. E. Bradley, Leeds ; 
(2) Diptera of Spurn Point, by Mr. C. A. Cheetham, Leeds. This exhibit 
was a small collection of Diptera taken on the occasion of the Yorkshire 
Naturalists’ Union Meeting at Spurn Point, August, 1919. (3) Chiron- 
omidae and Bibionidse of Yorkshire, by Mr. J. H. Ashworth, St. Annes- 
on-Sea. (4) Yorkshire Syrphidae, by Mr. Rosse Butterfield, Keighley. 
(5) Woodlice of Yorkshire, by Mr. F. Rhodes. 
( c ) Lepidoptera Committee . — Exhibits : (1 ) Melanie Lepidoptera, by 
Mr. Rosse Butterfield, Keighley ; (2) Hand-coloured figures of Varieties 
of Butterflies and Moths, by Mr. S. L. Mosley, Huddersfield. 
(d) Yorkshire Arachnida Committee . — Exhibits : Harvestmen, False 
Scorpions and Mites of Yorkshire, by Mr. W. Falconer. This exhibit 
dealt with the three least known of the four orders, the harvestmen, 
false -scorpions and mites, typical specimens of those only which have 
already occurred in Yorkshire being shown. 
Section E (Botany) : — 
(a) Botanical Survey Committee . — (1 ) Regional Survey of the Hudders- 
field District, by Dr. T. W. Woodhead. The basis of this survey was a 
study of the plant associations of part of the Southern Pennines, with 
Huddersfield as a centre. It considered the present and past distribution 
of man in relation to the distribution of the flora and fauna. It shewed 
how man’s activities have been determined in this district by the action 
of his environment. The area covered was about 250 square miles. A 
series of about 10 maps and models was shown illustrating the influence 
of these factors and their inter-relations. (2) Escarpment and Terrace 
Map, by Mr. W. S. Bisat. (3) Botanical Survey Maps and Diagrams 
with Explanatory Notes, by Dr. Wm. G. Smith : (i. ) Diagram of Types of 
British Vegetation ; ( ii .) Two Field Sheets of the West Riding of York- 
shire ; (Hi.) Two Field Sheets of North-east Yorkshire; (iv.) Two 
Half-inch Scale Published Maps of the West Riding. These maps were 
of the first English vegetation snrvey, and include two which have not 
yet been published. Additional diagrams summarised the effect of slope 
and of the underlying rocks upon the vegetation. (4) Topographical 
Relations of Woodlands, by Dr. W. H. Pearsall. These diagrams 
illustrated the development of woodlands in different stages of valley 
formation on the Yorkshire limestones. The general succession is, 
roughly : Scrub-Elm — Ash — Oak. (5) Interesting Yorkshire Plants, 
shown by Messrs. J. F. Robinson, C. Waterfall and R. W. Butcher. 
(b) Plant Galls Committee . — Exhibit of Plant Galls, by Mr. W. 
Falconer: I.- — Galls of Economic Interest: — (1 ) Destructive Fungus 
Parasites, (i.) Witches -brooms — Photographs; (ii.) Fruit Diseases — 
Bladder Plums ’ ; (2) Flies Destructive to Crops, Oscinis frit Linn. 
II. — Illustrating Other Special Lines of Enquiry : (1 ) Neglected or 
overlooked species ; (2) The Cynipidse of the oak, with their inquilines 
and parasites ; the phenomenon of parthenogenesis ; (3) Plant deforma- 
tions due to agencies hitherto unrecognised in this country, such as 
Aphrophora spumaria or parasitic fungi. 
(c) Bryological Committee . — (1 ) Slides prepared by the late R. Barnes, 
of Harrogate, in his study of peristomes, show the high standard of 
manipulative skill attained in this work. (2 ) Mosses of an Oak Wood on 
3922 Nov. 1 
