April, '08] JOURNAL OF ECONOMIC ENTOMOLOGY 91 



4 gallons of water. "The Black Leaf Extract of Tobacco" proved 

 equally successful when used at the rate of 1 gallon to 65 gallons of 

 cold water. 



If the kerosene emulsion or other commercial oil emulsions are used, 

 it should be with the usual precautions. Complete emulsification and 

 knowTi percentage of oil are essential. The above strengths of emul- 

 sion gave no injury used in the manner described. No practical bene- 

 fit was secured, so far as the green peach aphis is concerned, from the 

 use of orchard-boiled or commercial lime-sulphur washes, applied late 

 in the spring just before the buds open. All spring prunings of the 

 peach twigs should be gathered up and burned to prevent the aphis 

 eggs harbored upon them from hatching and the lice crawling back 

 upon the tree. 



[Mr. HeatUee's paper on Diahrotica vittata. together with the discussion 

 thereupon, has been held till the next issue, owing to delay in submitting the 

 manuscript. — E. P. F.] 



The following paper was presented : 



A KEY SUGGESTED FOR THE CLASSIFICATION OF EN- 

 TOMOLOGICAL RECORDS 



By W. E. Hinds and F. C. Bishopp. 



Object and application of key. This key is designed to facilitate 

 the arrangement of entomological notes, materials, etc. It is not to be 

 used as are guide cards, but all cards belonging in the key are placed 

 together in front of the note file to show the general plan of arrange- 

 ment of the notes which follow. Thus one key serves for the entire 

 note system and no repetition is needed for the various species regard- 

 ing which notes are made. 



It is not at all necessary that all notes to be classified according to 

 this key should be prepared in any particular form or kept together 

 in one place. In fact, the key may be applied almost equally well to 

 any notes except those in bound books. No argument is needed as 

 to the many advantages of the modern card system over the old bound 

 note book system. The size of cards to be used is a matter for per- 

 sonal choice and the only argument for uniformity is that of conven- 

 ience in filing and handling the notes. In the Cotton Boll Weevil in- 

 vestigation a four by six inch card was found to be most convenient 

 for field notes and therefore adopted for practically all records of 

 the investigation. The cards were prepared by the printer in the 



