NOTES AND QUERIES. 267 



proved most harmful on Sitka spruce. I am anxious that the 

 distribution of this aphis in Scotland should be worked out, and 

 for this purpose would welcome examples of aphis found on Picea 

 excelsa or any of the other species of spruce. The best way 

 in which to send the specimens would be to place some shoots 

 containing the aphis in a cleaned out mustard or cocoa tin. 



The Large Larch Sawfly {Nemains erichsoni). This is one 

 of the insect enemies scheduled by the Board of Agriculture 

 and Fisheries. Its distribution in Scotland is not well known. 

 Our Scottish foresters could settle this matter in a season. 

 The caterpillars of this sawfly are found only on Larix. I 

 would willingly send a specimen of the caterpillar to any of 

 the members of the Society who have opportunity of making 

 observations on larch. The caterpillar is easily recognised by 

 the following characters: — Head, black. Body, grey-green. 

 Legs, twenty in number; the front six black, the others grey- 

 green. The caterpillars should be looked for in July and 

 August. Any records received will be duly chronicled in the 



Transactions. 



R. Stev^art MacDougall. 



The Oleoresins of some Western Pines. 



The shortage in the supply of the better qualities of turpentine 

 in recent years, and the steadily increasing demand, has naturally 

 directed attention to the possibility of increasing the sources of 

 supply at present available. 



In the Forest Service Bulletin, 119, 1913, an account is given 

 of such an investigation carried out by the Forest Products 

 branch of the U.S. Department of Agriculture. 



Owing to the rapid decrease in the supply of Longleaf pine 

 and Cuban pine, experiments were carried out to see if the 

 various species of western pine yielded a turpentine of com- 

 mercial value. The following species were examined : — Western 

 yellow pine {Pinus ponderosa, Laws.), grown in Arizona; western 

 yellow pine, Digger pine {Pinus Sabiniana, Dougl.) ; lodgepole 

 pine {Pinus contorta, Laud.) ; and sugar pine {Pinus Lambertiana, 

 Dougl.), grown in the Sierra National Forest in California; 

 and Pinon pine {Pinus edulis, Engelm.), from the Montezuma 

 Forest, Colorado. 



The trees were tapped by the " cup system " and the samples 



