COUNTIES OF NORTHUMBERLAND AND DURHAM 465 



This minute and slender species is apparently not un- 

 common in the counties of Northumberland and Durham. 



The form of the anal plate readily distinguishes it from all 

 other species, whilst the shape of the third pair of tactile setas, 

 each of which has the distal third more slender than the 

 preceding part and sparingly furnished with rather long erect 

 pubescence, is another good character. 



British Distribution. — Under logs lying by the roadside, 

 and under the bark of standing tree stumps in a wood on the 

 banks of the Wansbeck near Mitford, Northumberland ; and 

 under stones and logs in woods and fields, Brockwell, Axwell 

 Park, Winlaton, and Winlaton Mill, in the Derwent Valley, 

 County Durham, May, 1909. 



Distribution. — Denmark (Hansen); England. 



Pauropus gracilis Hansen. 



Pauropus gracilis Hansen, Vidensk. Medd. fra den naturh. 

 Foren., 1901, pp. 395-7, pi. v., figs, sa-sf, 1902. 



On the occasion of the meeting of the British Mycological 

 Society held in Gibside on October 4th, 1907, I found a very 

 minute species of Pauropus living in numbers beneath the 

 bark of a fallen tree lying in a damp situation, and also 

 amongst dead leaves near by; in July, 1908, the species was 

 again seen, whilst in May of this year I gathered numerous 

 specimens, all of which are referable to P. gracilis Hansen. 

 I have also specimens from Mitford. 



Though closely allied to P. vulgaris Hansen, the species is, 

 I think, abundantly distinct, and may at once be separated by 

 the form of the third pair of tactile setae, and by the anal plate, 

 which differs very considerably from that in P. vulgaris. It is 

 also a smaller animal (about o'6 mm.), and even more slender 

 than P. vulgaris. 



British Distribution. — Under bark of fallen trees and 

 amongst dead leaves, Gibside, County Durham, May, July, 

 October; and under bark of a fallen fir branch and of standing 

 tree stumps, Mitford, Northumberland, May, 1909. 



