1903 ENTOMOLOGICAL SOCIETY. 59 



Order Hymenoptera. 



66. The Linden slut?, Selandria tilke, Nort, a common species on basswood, occurs 

 throughout Ontario. 



67. The Willow Sawfly, Cimbex Americana, Leach. This is a common species throughout 

 Ontario, the larva always attracting attention when noticed. It feeds chiefly on willow and 

 elm, but Harrington records it as feeding on linden at Ottawa. (Rep. Ent. Soc. XV. 65). 



Order Dipteka. 



68. Cecidomyia verrucicola, O. S. This common gall gnat is recorded by Smith as occur- 

 ring frequently at New Brunswick and elsewhere in the State of New Jersey, on the leaves of 

 linden. 



Order Acakina. 



Some of the Phytoptid*, the family to which the well known Pear-leaf Blister-mite 

 belongs, commonly called gall-mites produce galls of various sizes and shapes upon the leaves 

 of the plants they infest. 



69. The Linden gall-mite, Phytoptns ab)tormis, Garman. This species is recorded by 

 H. Garman in Forbes's 1st Annual Report as producing galls on the leaves of American linden, 

 at Bloomington, 111. 



70. The Clover mite, h'ryobia pratensis, Garman. Eggs of the clover mite have been 

 found at Ottawa on basswood, by Dr. Fletcher, but no injury has been recorded. 



OCCURRING ON THE BARK. 



The insects which occur on the bark are all homopterous species, and obtain their food by 

 means of their 6eaAs, through which they suck up the juices. 



71. The Maple-tree Scale-msect, Pulvinaria innumerabilis, Rathvon. In Ontario this 

 species has probably been the most abundant of those which occur on the bark. The maple 

 is the tree upon which it is most frequently found, but it has an extensive range of food-plants, 

 among which is the basswood. In the City of London, the past season this insect was very 

 conspicuous, owing to the white cottony mass which surrounds the eggs. Dr. Bethune rt-fers 

 to this infestation in London in another part of this Report. 



72. The Oyster-shell Bark-louse, Lepidosaphes ulmi \.. = Myiilaspis pomonan, Bouche. 

 This scale insect is paiticularly destructive to the apple tree, and is one of the commonest of 

 the well known insect pests of the orchard. The species, however, has been found on linden 

 as well as on a great many other trees and shrubs. An ordinary lime wash (I Hi fresh lime 

 in 1 gallon of water) sprayed on to the trees in early winter, and again soon after the first 

 application is thoroughly dry, has been found very effective at the Central Experimental Farm. 

 This material flakes oft' the trees during the winter and takes with it large numbers of the 

 scales. This^ treatment should be followed in the spring, when the young plant lice are hatch- 

 ing, with a spray of kerosene emulsion, whale oil soap, or tobacco and soap solution. 



73. The Sin Jose Scale, Aspidiotus penilciosus, Comst. This the most deadly of all fruit 

 insects also has a wide range of food plants, including the basswood. In Canada the insect is 

 fortunately confined to certain areas in Ontario, but in those areas it has been the cause of 

 terrible destruction to peach, apple, plum, and pear trees, and has been found in numbers on 



I other trees and bushes adjacent to infested orchards. 

 74 The Putnam Scale, Aspidiotvs anculns, Putn. This scale is also recorded as recurring 

 on linden . In Canada the species has several food plants, and, while not abundant enough to 

 be considered injurious, is not uncommon in Ontario. 



