-Sy- 



frenulum if there be one ;* it is well to remove the patagium 

 first, f 



2. Dip the wings in alcohol in order to wet them. 



3. Immerse them for an instant in hydrochloric acid 

 (muriatic acid). Use for this purpose dilute acid, one part 

 acid to nine parts water. 



4. Put them in Labaraque solution with the upper surface 

 of the wings down, and leave them there till the color has 

 been removed from the scales. If a wing bleaches slowly, 

 the process can be hastened by dipping it in the dilute acid 

 and returning it to the Labaraque solution from time to time. 

 This solution can be procured of most druggists. It deteri- 

 orates if left exposed in strong sunlight. If it cannot be 

 obtained, use an aqueous solution of chloride of lime. 



5. When a wing is bleached, put it in alcohol and leave it 

 there till after it floats. This is to wash off the I,abaraque 

 solution. The wing can then be mounted on a card. But 

 it is better to mount it as described below. 



6. Transfer the wing to a clearing mixture, if it is to be 

 mounted in balsam, and leave it there five or ten minutes. 

 This is to remove any water there may be on it. A good 

 clearing mixture can be made by mixing two parts by 

 measure of carbolic acid crystals and three parts of rectified 

 oil of turpentine. 



7. Put the wing on a glass slip with considerable clearing 

 mixture under it to avoid bubbles ; put Canada balsam on 

 top, and cover with thin glass. In the case of small wings, 

 it is best to transfer them from one solution to another, and 

 to the glass slip by means of a camel's-hair brush. £ 



* The frenulum is a strong spine or bunch of bristles borne by the hind wing at 

 the humeral angle in most moths. 



t The patagia are the paraptera of the mesothorax , they are scale-like append- 

 ages at the bases of the fore wings. 



\ In the case of very small wings, as those of Tineids, the very fine veins are 

 nure distinct when mounted in glycerine than when mounted in Canada balsam. 



