264 THE SCOTTISH NATURALIST 



Orthoptera. 



Forficula auricularia, L. The Earwig is abundant on the Bass. 

 On 21st August 1909 I found many in Gannets' nests. 



COLLEMBOLA. 



The following Springtails were found in October 191 1 : 

 Tomocerus minor, Lubb. ( = tridentiferus, Tullb.). Several. 

 Isotoma paZustris, Mull. A few. 



MYRIAPODA. 



Lithobius forficatus, L. Common under stones; October 1911, 

 March 19 13, and July 191S. 



Lithobius crassipes, L. Koch One, March 1913. 



Geophilus trimcorum, Bergs, and Mein. One taken in October 

 1911. 



Brachydesmas superus, Latz. Two on same occasion as the last. 



CRUSTACEA. 



Oniscus aseZZus, L. Common, March 19 13, etc. 

 PorceZZio scaber, Latr. Also common, March 19 13, etc. 

 Orchestia iittorea, Mont. Plentiful along with the above 

 "slaters" under stones on the slope below the ruins, March 1913. 



ARACHNIDA. 



Only three species of Spiders and one " Harvestman " have 

 been noted ; they are : 



Drassus Zapidosus, Walck. A large female, July 1918. 



Bathypha?ites concoior, Wid. Adult male and female, October 

 1 911; adult female and several immature examples, March 



19 X 3- 



Tiso vagans, Blackw. Adult male, March 1913. 



Acantholophus agrestis, Meade Several, October 191 1. 



A search for Mites would no doubt reveal the presence of a 

 considerable number of species. In some moss collected in 

 October 191 1 it was noticed that Oribatids (two or more species) 

 were common, while on another occasion several Gamasids and a 

 Rhincolophus were seen. The lighthouse-keepers suffer severely at 

 times from what I take to be the "bites" of a Harvest-mite, 



