THE CANADIAN ENTOMOLOGIST 311 



HamamelidacecB Liquidambar styraciflua Sweet gum. 



Juglandacecs Hicoria alba Shag-bark hickor>\ 



Juglans cinerea Butternut. 



" i}igra Black walnut. 



LauracecB Sassafras sassafras Sassafras. 



LeguminoscB Cercis canadensis Red bud, 



' Gyvmocladtts dioica Kentucky coffee tree. 



, Cleditsia triacanthos Honey locust. 



Robinia pseudacacid False acacia. 



MagnoliacecB Magnolia spp Magnolia. 



OleacecB Fraxinus americana White ash. 



Amelanchier canadensis Shad bush. 



RosacecB Prunns armeneaca Apricot. 



" cerasus Cherry-. 



" domestica Plum. 



" " galatensis Prune. 



Pyriis communis Pear. 



" tnalus Apple. 



Rosa spp Rose. 



Rubiis spp Cultivated blackberr3\ 



Rubus spp ...: " raspberry. 



Salicacece Populus spp ./...Poplar. . 



Salix spp Willow. 



SaxifragacecB Ribes spp Currant. 



" " Gooseberry. 



SolanacecE Solanum dulcamara Climbing bittersweet. 



TiliacecE Tilia americana Linden. 



Urticacece , Celtis occidentalis Hackberry. 



: Madura pomifera Osage orange. 



Morus rubra Red mulberry. 



L'lmus americana American elm. 



Vitacea Vitis spp Grape. 



Life History. — Lecanium corni passes the winter in the second 

 instar, the larvae being found attached to the bark, generally pre- 

 ferring the underside of the branch and appearing as small, brown, 

 flattened, oval bodies closely appressed to the surface. The ap- 

 pendages are withdrawn beneath the scale over which a thin, 

 transparent, waxy covering is secreted. 



Growth in spring is coincident with the beginning of sap flow, 

 the insects seldom migrating, and within a week moulting for the 

 second time. (Plate XV, fig. 5). Following this the male larva 

 undergoes a series of transformations quite distinct from those of 

 the female. . 



