consists of a strip of rubber one-eighth of an inch thick, three inches long, and one and one-half inches wide. It is stapled to the screen, receives a straightwalled vial or an aspirating tube, and is self-closing.For mid-limb feedinps the cage can be opened, worked over the foliage, and when in position snapped shut over the limb. For terminal feedings, a wire or a cord may be attached from the free end of the cage to an upper limb; the cord supports the cage and so allows the foliage to be centred. For host range studies in the insectary, herbaceous plants from cherry orchards are grown in flower pots and the feeding cage clamped around them.Sometimes large numbers of insects must be used for more than one feeding. In such cases the insects in the cage are anaesthetized, removed, and placed in a second feeding cage. Anaesthesia is accomplished by wrapping a sheet of oilcloth around the cage and inserting a piece of ether-soaked cotton through the insertion valve. If it is necessarv to kill the insects, cyanide preparations may be employed in the same way. ' Cages must be well aerated after the use of cvanide.T h e points of superiority of the bi-valve type of insect feeding cage over the others that have been used are: ( 1 ) It minimizes temperature increases. (2) It prevents insect entanglement on the side of the cage as may be the case with muslin covering. ( 3 ) I t simplifies introduction and removal of insects. (4) It protects insects from rain. (5) It is easily placed in position on the tree, is self-centring, and may be readily adapted for use on spur or twig. (6) It is low in cost, easy to construct, and very durable. (7) It is suitable for both field and insectary use.
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