350 



OONTENT8 



Mites Infesting Potatoes' 451 



Scabby potatoes from Westchester county, N. Y., with cavities eaten by millepeds 

 swarming with mites, 451 . Identified as a species of Rhizoglyphus near phylloxera}, 

 451. Identical examples seen feeding on decaying vegetable matter, 451. Some of the 

 genus carnivorous, 451 . This species previously seen associated with potato scab and 

 thought to be its cause, 451. Other mites observed in cavities in potatoes, 451. 

 Uropoda Americana parasitic on Julus, 451. The Jvegetarian form may b 9 named 

 Uropoda obovatus, 451. 



Tyroglyphus Lintneri, a Mushroom Infesting Mite 452 



Mushrooms from Suffolk county, N. Y., infested with mites, 452. Near to T. 

 phylloxera}, 452. Described by Prof. Osborn as T. Lintneri, 452. Figures of the 

 mite, 452. Its description, copied from "Science," 452-3. Wherein it differs from 



phylloxera}, 453. 



Phytoptus pyri, the Pear-Leaf Blister-Mite 453 



Its bibliography, 453-4. Its injuries, but not its cause, long known in tho United 

 8tates, 454. Identification with an European species, 454. The mite observed by Dr. 

 Taylor in Washington, 455. Habits and appearance recorded by Glover, 455. Com- 

 pared with the European mite, known as Typhlodromus pyri, 455. How the attack 

 commences, 455. Progress and result of the attack, 455. Its rapid spread, 455. Is 

 increasing in New York and other States, 455. How the attack may be rec agnized, 456. 

 Small size of the mite — almost invisible to the unaided eye, 456. Infestation of 

 Kieffer pears, 456. Is the Kieffer particularly liable to attack ? 456. Some other varie- 

 ties infested, 456. How the mites may be carried from a tree or an orchard to others, 



456. Characters of the Phytoptidse, 456. The galls that the} produce in plants, 457. 

 Those that live within buds, 457. The varied galls that they produce, 457. Trees, 

 shrubs, etc . , on which they occur, 457. Their minute size, 457. The ash-tree Phytoptus, 



457. The extraordinary structure of Phytoptus, 457. Possesses but two pairs of legs, 

 457. How it feeds, 457. The Phytoptidse recently separated into subfamilies, 457. 

 Writings of Dr. Nalepa, 457. Characters of subfamilies, 457. The pear Phytoptus as 

 figured by Dr. Nalepa, 458. Its description, 458. Sulphur compounds favorite remedies 

 for mites, 458. Bordeaux mixture for their destruction, 458. Difficult to reach within 

 their galls, 459. Removing and burning infested leaves or branches, 459. Spraying a 

 more convenient remedy, 459. The pear Phytoptus can be exterminated by spraying 

 in winter with kerosene emulsion, 459. Mr. Slingerland's experiments, 459. A peach- 

 tree Phytoptus observed by Dr. Taylor in 1872, in Washington, 459. Whitened the 

 leaves of a peach-tree, 459. Was only seen in this one instance, 459. No record 

 made of the observation up to the present time, 459. Was probably the Phytoptus 

 persicce noticed as whitening the leaves of peach-trees in France, in 1851,460. Was 

 known as " le mourner," the miller, 460. A plum-tree Phytoptus, producing excres- 

 cences at the base of plum-tree buds and shoots, 460. Identified by Mr. Slingerland aa 



