io8 THE SCOTTISH NATURALIST 



tions on the food of wild birds the volumetric or percentage 

 by bulk method will be employed rather than any of the 

 various modifications of the numerical system. Apart from 

 the advantage of bringing our investigations into line with 

 those of other workers, it is highly important at the present 

 time that the results obtained by British workers should be 

 something more than " interesting " or expressions of 

 " indefinite opinion," they must express as accurately as 

 possible " the ratios each element bears to the other," for 

 it is only upon such results that we can form a reliable 

 estimate of the injurious or beneficial nature of any particular 

 species of wild bird. 



Trichoniscoides sarsi and T. albidus in the Lothians. 

 Referring to my record in Scot. Nat. for February 191 7 of the 

 occurrence of Trichoniscoid.es sarsi, Patience, on the Isle of May, I 

 find that I have also three examples of this species among material 

 collected near Gullane Point, East Lothian, on 20th September 1913. 

 They have been submitted to Dr Collinge for authentication. 

 Another tiny Wood-louse taken at same time is, Dr Collinge states, 

 T. albidus, Budde-Lund, a species not hitherto recorded from the 

 Forth area. I am also indebted to him for the determination of a 

 specimen of this latter species from ground moss on the banks of 

 the Esk, below Hawthornden, Midlothian, 17th November 191 7. 

 To the above records may be added that of several examples of 

 Haplophthalmus mengii, Zadd., taken on the Isle of May in 

 September 191 1 and November 1912. William Evans, 

 Edinburgh. 



