BULLETIiSr 351, U. S. DEPARTMENT OF AGRICULTURE. 



FOOD PLANTS. 



Eulecanium nigrofasciatum attacks more than 30 species of plants. 

 It becomes abundant, however, upon only a comparatively few of 

 these. Its preference for its principal food plants is about in the 

 folio whig order: Peach, plum, maple, cherry, sycamore, mistletoe. 



The following Hst includes aU of the host plants k[io-v\Ti to the 

 author : 



Acer pseudoplatanus L. Sycamore maple. 



Acer saccharinum L. Silver maple. 



Acer saccharum Marsh. Sugar or rock 

 maple. 



Amygdaliis persica L. and var. Peach 

 and nectarine. 



Benzoin aestivale (L.) Xees. Spice-bush. 



Betula sp. Birch. 



Bumelia angustifolia Nutt. Saffron plum. 



Castanea dentata (Marah . ) Borkh . Chest- 

 nut. 



Cercis canadensis L. Red-bud. 



Chaenomeles japonica Lindl. Japan 

 qiiince. 



Clematis sp. Clematis. 



Crataegus oxyacantha L. Hawthorn. 



Crataegus. Most species. 



Cydonia oblonga Mill. Quince. 



Elaeagnus angustifolia L. Oleaster. 



Euonymus atropurpureus Jacq. Wahoo 

 or burning bush. 



Fraxinus sp. Ash. 



Ilex opaca Ait. American or white holly. 



Magnolia virginiana L. Sweet bay. 



Melia azedarach L. Wild China-tree. 



Morus spp. Mulberry. 



Nerium oleander L. Oleander. Rose 

 bay. 



Ollea sp. Olive. 



Padus sp. "Wild cherry. 



Phoradendron sp. Mistletoe. 



Platanus occidentalis L. Sycamore or 

 plane-tree. 



Platanus orientalis L. European plane- 

 tree. 



Populus deltoides Marsh. Cottonwood. 



Prunus sinconii Carr. Simon or apricot 

 plum. 



Prunus spp. Cultivated and wild cher- 

 ries and plums. 



Pyrus communis L. Pear. 



Pyrus malus (L.) Britton. Apple. 



Quercus virginiana Mill. Live oak. 



Ribes sp. Gooseberry. 



Rosa spp. Roses. 



Salix babylonica L. Weeping willow. 



Salix spp. Willows. 



Sapindus marginatus Willd. Soapberry. 



Tilia sp. Linden or basswood. 



LTmbelhferse. One species. 



Vacdnium spp. Blueberries. 



Vitis vinifera L. European grape. 



Vitis spp. 



LIFE HISTORY. 



MATURING OF FEMALES IN SPRING. 



Hibernation is terminated by weather conch tions. The conditions 

 that cause the peach buds to open also bring this lecanium to the end 

 of hibernation. At Mont Alto, Pa., in 1913, liibemation ended about 

 April 1, at which time many blossoms were ready to burst. From 

 April 1 to May 1 growth was rapid. From May 1 to May 16 it was 

 comparatively slow. At the latter date the advanced females 

 reached their maximum size, which they retained until the period of 

 reproduction was nearly over. All the females had reached maturity 

 by June 10. Table I shows the muiimum, maximum, and average 

 sizes of 414 specimens measured during the spring development and 

 the reproduction periods of 1912 and 1913 at Mont Alto, Pa. 



