42 THE entomologist's record. 



captured 30 and kept them alive. These were put in a cage with 

 nettles. A few days later, we were pleased to find that a fair number 

 of ova had been deposited on the upperside of the nettle leaves. A 

 few were deposited at intervals till the first week in November, when 

 the last female died. Up to this time, the eggs have not hatched. 

 Perhaps some reader will give us details of his success in a similar 

 experiment. To continue, however, with the occurrence at various 

 localities at Durham. Proceeding further up the Derwent valley we 

 found that they still were fairly plentiful but in decreasing numbers. 

 On returning to Birtley, I went out two days later and found it in 

 hundreds, in the old stone quarry mentioned above, and on the old 

 slag heaps from the blast furnaces. In all cases the insects were at 

 the heads of Picris and were accompanied by Pludn i/amma. 



Struck by this unusual abundance, Mr. Johnson and nayself 

 suggested asking for reports from observers throughout Durham and 

 Northumberland. With the kindly help of the Rev. W. J. Wingate, 

 secretary of the Durham County Naturalists' Union, this was done 

 with the following result : — 



I, On the sea coast. — North l>i(rliavi. — A few seen. South 

 Durham. — Ryhope to Castle Eden, flowers alive with them ; Trimdon 

 Grange, scores seen ; Hartlepool, very common. Xorth Vorks. — - 

 Middlesborough, abundant ; Eedcar, numerous. The general remark 

 accompanying the above records was that they were abundant and 

 fresh. 



II. Inland. — j\J id -Durham. — Derwent valley, very abundant but 

 worn ; Gateshead, common even in the streets, worn ; Birtley, abun- 

 dant but very ragged; Durham, absent ; Bishop Auckland, practically 

 absent. West Durham. — Reports generally say that the insect was 

 absent except at Burnhope, where one was taken, and at Bollihope where 

 several were captured. 



As our dates are a few days in advance of most other records, I 

 would suggest that this migration had reached the Durham and 

 Yorkshire coasts first. From Northumberland no specimens are 

 mentioned. In Durham the insects seem to have reached the coast. 

 Then they had travelled up the Tyne valley branching thence up the 

 Team and Derwent valleys. I should like a suggestion as to why they 

 were absolutely absent from the Wear valley. 



Synopsis of the Orthoptera of Western Europe. 



By MALCOLM BURR, B.A., F.L.S., F.Z.S., F.E.S. 



{Continued frofii p. 10.) 



Genus 7 : Chelidura, Latreille. 



This genus includes a number of mountain forms, apterous, with 

 stout or slender forceps, separate at the base, and not dilated ; in the 

 males, the abdomen is more or less dilated from the middle to the 

 roots of the forceps. In addition to the European forms, there is one 

 American, one South African, and one Madeiran species. 



1. Elytra free, longer than broad. 



2. Subanal plate d produced beyond pygidium, with 



2 points .. .. .. .. .. ..1. ANALis, Ranibur. 



2.2. Subanal plate s not produced beyond pygidium. 



