312 AMERICAN POMOLOGY. 



smooth bark near a bud ; it is blackish, uneven, shining, 

 with a pale margin. 



Another pear tree bark-louse was described by the 

 lamented A. O. Moore, of New York, as a white, papery 

 scale, giving a claret-colored juice when scraped. This, 

 in the winter, consists of a defunct mother and her brood 

 of eggs, the breaking of which gives the color. Alkaline 

 washes are recommended to be applied in the spring. 

 Mr. Walsh thinks this insect cannot be the same as that 

 mentioned by Dr. Harris, on p. 222 of his report, under 

 the name of Coccus crypto gamus, (Dalman), who found 

 it upon the Aspen, and therefore he has named it Coccus ? 

 Harrisii* 



Lecanium vitis, (Linn.\ or the Vine Bark-louse, is 

 mentioned by Fitch as having been found on grape vines 

 in June. It is hemispherical and brown. A cottony sub- 

 stance was extruded from one end of the scale, and this 

 increased until July, when minute insects crept out and 

 scattered over the bark, upon which they fixed themselves. 

 This insect is not very common, but its first appearance 

 should be closely watched, and its destruction promptly 

 effected. 



APHIDES. PLANT-LICE. 



These are the most extraordinary insects, being found 

 upon almost all parts of plants, and there is scarcely a 

 species which does not support one or more kinds peculiar 

 to itself. Then they are so exceedingly prolific ! Reau- 



* See Practical Entomologist, Vol. II, p. 31. 



