38 COLLECTING AND PRESERVING INSECTS 



Keeping Records. Some form of entomological bookkeeping 

 is desirable for any one wishing to make an extended study of the 

 subject. Observations in the field or in the insectary can be made 

 upon small sheets of perforated paper, temporarily bound in leather 

 covers of a size suitable for the pocket, care being taken not to 





FIG. 63. Showing method of making envelopes for butterflies. 



write an observation upon two or more insects on the same sheet. 

 These sheets can later be removed from the temporary cover, and 

 each one filed in a box devoted to a special insect or a special set 

 of observations. Accessions to the collection may be entered in a 



Fia. 64. A convenient form of card index and container. 



book, the accession number referring to a special collection or set 

 of insects, and the sub-numbers placed on the side referring to the 

 individual specimens in the collection. In this case the insect 

 would bear a label showing its accession number and sub-number, 

 as in figure 48. 



A card index (Fig. 64) is found to be a very valuable aid, by 



