British Oribatidie. By A. B. Michael 237 



Kobin is ihefemm-al of Nicolet ; in other respects, Nicolet's names 

 for parts of the exo-skeleton are preserved. 



The sexes are not described separately, their external differences 

 being usually so slight that it is unnecessary. 



All measurements are in decimals of a millimetre. 



A reference to Koch without naming the work means his 

 * Deutschland's Crustaceen Miriapoden und Arachniden,' Kegens- 

 burg, 1841. 



In the Plates, all whole creatures are drawn x 65, most details 

 are x 300. 



All the figures are drawn from nature, except Figures 4 and 5, 

 Plate IX. 



All whole creatures were drawn in the first instance with the 

 camera. 



GENUS PELOPS. 



1. Pelops faeinosus. Nic. 



Nic. 425. 



Found at Kirton Lindsey by Mr. George, and by me at Epping 

 Forest and Loch Maree ; not uncommon. 



The Enghsh specimens have not the round spot in the centre 

 of the abdomen figured by Nicolet, nor the two spatulate hairs one 

 on each side of it, and the stigmata are not as deeply sunk as in 

 Nicolet's drawing. It might be said these differences are sufficient 

 to constitute a species, but in the absence of further evidence, I 

 prefer considering them as showing a variety only. 



GENUS OEIBATA. 



2. Okie AT A alata. Herm. 

 Notaspis alatus. Hermann, ' Memoire Apterologique.' 



,, „ Duges, 3rd Memoire, 47. 



Acarus eoleoptratus. Linnaeus, 2nd edn. No., 1973. 

 Zetes dorsalis. Koch, fasc. 2, pi. 14. 

 Orihata alata. Gervais, ' Histoire Nat. des Apteres,' vol. iii. 258. 



„ „ Nicolet, 'Hist. Nat. des Acariens,' &c., 431. 



Found by Mr. George at Kirton Lindsey, and by me at Epping 

 Forest. 



3. Oribata Lucasii. Nic. 



Nic. 432. 

 Zetes Isevigatus. Koch, fasc. 3, pi. 8. 

 Found at Epping Forest. 



4. Oribata nitens. Nic. 



Nic. 433. 

 Found at Epping Forest. 



