202 REPORT OF THE DEPARTMENT OF ENTOMOLOGY OF THE 
FOOD PLANTS. 
The beetle attacks practically all of the poplars, willows and 
alders, for there are very few species that escape injury. Mr. 
J. G. Jack reports that the beetle has proved destructive to 
almost all species of willow and all the cultivated poplars grown 
in the Arnold Arboretum. It has been found boring in the 
stems of all native willows with the exception of a few mountain 
or very slender stemmed species which are too small to afford 
the borers sufficient sustenance. Of the foreign willows which 
make large trees, such species as the white willow, crack willow 
and laurel-leaved willow, are more or less attacked, though not 
so liable to injury as the Babylonian weeping willow. The 
beetle has been rarely found in small plants of two species of 
birch, the drawf birch, Betula pumila, and the red or river birch, 
B. mera. | 
The plants in the following list are mentioned by German writers 
as being subject to the attacks of C. Japathi in Europe: Alpine alder, 
Alnus viridis D. C., white alder, A. wncana Willd., black alder, A. 
glutinosa Willd., purple willow, Salix purpurea L., osier willow, 
S. viminalis L., S. triandra, Kilmarnock willow, S. caprea L., white 
poplar, Populus alba L., and Rumex hydrolapathum L. 
The species mentioned as food plants in this country are: White 
willow, S. alba L., crack willow, S. fragilis L., weeping willow, S. 
babylomca VYourn., dwarf birch, Betula pumila L., red river birch, 
B. migra L., Balm of Gilead, Populus balsamifera L. var. candicans 
Gray, Carolina poplar, P. monilifera Ait., and silver-leaf poplar, 
P. alba L. var. bolleana. ‘The trees that have been observed to 
sustain injuries in this immediate locality are P. monilifera Ait., 
S. lucida Muhl., S. caprea L., S. cordata Muhl., S. sericea Marsh., - 
S. alba L., and S. amygdaloides Anders. 
These latter were kindly determined by Prof. W. W. Rowlee . 
of Cornell University. 
LIFE STAGES AND HABITS OF THE INSeiae 
THE EGG STAGE. 
Description of egg— The egg is of a white color turning to a 
pale yellow when several days old. The shell is thin and 
fragile, the surface being smooth and slightly viscous. ‘The 
shape is elongated oval, obtusely rounded at the ends, often- 
times determined by the shape of the cavity. The longer axis 
is I.1 mm. and the shorter axis .8 mm. in length. 
