ON LABELING SPECIMENS AND TAKING NOTES. 



317 



electric light, or in the twilight. We have sheets of 

 labels printed for this purpose (Fig. 283). 



When more than one label is used _ t- i.. t. -, .. 



Sugar. Light. Twilight. 



they are spaced qn the pin so that |;;|-: ]j^ Twilight, 

 each can be read. |;;|- Light. Twilight. 



Numbered Species. — In the ^"«"- ^'^^'- twilight, 

 study of life histories it is often nee- 'dicatingconditioS 

 essary to record more information of capture, 

 than can be placed upon labels. In such cases the 

 specimens and notes should be given corresponding 

 numbers. Even in this case it is not best to give 

 each specimen a distinct number; a much simpler 

 way is to give all specimens of each species the same 

 number. 



Suppose, for example, that the first species studied 

 is the apple-tree tent-caterpillar. In this case all the 

 specimens of this species should be labeled No. i, 

 and all notes on this species should have the same 

 number. The next species studied should be num- 

 bered No. 2, and so on. 



The locality and date labels, already described, 

 can be used in connection with the numbered labels; 

 there is no objection to putting two or three labels 

 on a specimen if each records additional informa- 

 tion. 



Sometimes it is desirable to make notes regarding 

 a particular specimen, which shows some individual 

 peculiarity or was collected under peculiar conditions. 

 In such a case use is made of a subnumber, which is 

 written on the label below the number referring to 

 the species. 



Fig. 284 represents a sheet of labels such as we 

 use for our numbered species. Cornell U. is printed 



