264 THE ENTOMOLOGIST. 



mites but that grease does not appear in the drawers when 

 naphthaline is used in the camphor-cells. I can only say I have 

 used naphthaline for about two years, and, so far as I can see, 

 there is nothing half so good all round both against mites and 

 grease. In many cases I find camphor is still used, and generally 

 plenty of grease can be seen on nearly all the insects. — Edward 

 Cooke; 30, Museum Street, W.C., August 16, 1882. 



Prevention of Mould. — The Rev. J. Tasker (Entom. xv. 

 233) says that glacial carbolic acid is a perfect remedy for mould. 

 Now, as this preventative will doubtless be tried by some of your 

 readers, and as I suffered some years since from using it precisely 

 in the manner described by your correspondent, and which, I 

 may add, was recommended to me by good authority, I should 

 like, by way of a caution, to let others know the result of 

 my experiment. The prepared pads ©f cotton-wool were placed 

 in my drawers of Lepidoptera. This was no sooner done than it 

 was evident that mould could not exist in its company ; but ere 

 sufficient time hf \ cl:i,psed for me to thank my informer, and 

 congratulate myself upon the success obtained, I discovered 

 another and more serious evil in connection with the Whites, 

 which in some instances were fast turning to a dirty cream-colour ; 

 this fact was most conspicuous with Liparis salicis, Dysthymia 

 Acontia, and Melanippe hastata, but, on the other hand, none of 

 the Diurni had changed in appearance. Here was a curious 

 problem, but one easy to solve, as the former species had been 

 cyanised with spirits of wine possessing the orthodox proportion 

 of corrosive sublimate, while the latter had not been so treated. 

 A subsequent special experiment corroborated the previous result, 

 and at once clearly demonstrated that either the use of glacial 

 carbolic acid, or cyanising insects which happened to have white 

 upon them, must be abandoned. — H. T. Dobson, jun.. New 

 Maiden, Surrey, Oct. 21, 1882. 



Erratum. — At p. 238 the capture of Harpalus oblongiusculus 

 is stated to have been made by the Rev. 0. P. Cambridge. The 

 capture was made and the communication sent by Mr. Frederick 

 O. P. Cambridge. 



