218 SCALE-INSECTS, BARK-LICE, MEALY-BUGS. 
sucking organs to obtain the liquid sap; here they pass through 
their various stages of growth before the winter approaches. 
Lecanium migrofasciatum Perg. (The Peach Lecanium). 
This insect, shown in Fig. 178, occurs further south and 
east on the peach, on various kinds of cultivated and wild plums, 
on sugar-maple, apple, and on other plants. Here in Minne- 
sota it was once found in great abundance on a wild plum, but 
soon disappeared. 
h 
Fic. 178—Lecanium nigrofasciatum Fic. 179—Pulvinaria innumerabilis 
Perg. Greatly enlarged. After Rathv.: a, female on a leaf in late 
Div. of Entomology, Dep. of Agri- spring; b, same on twig. After Div. 
culture. of Entomology, Dep. of Agriculture. 
Lecanium ribis Fitch. (The Currant-scale). 
This has been reported several times as being found on the 
bark of currant-stems early in spring. The scale is also hemi- 
spherical, brownish-yellow, and about one-third of an inch in 
diameter. Thus far it has caused no damage. 
Many other species occur, but as all can be destroyed by 
the same remedy, it is not necessary to describe them in detail. 
The genus Pulvinaria can be distinguished from the genus 
Lecanium by the fact that the adult females secrete a large mass 
