428 
The Ohio Naturalist. 
[Vol. IX, No. 3 , 
About the middle of July the larvae became very numerous 
and the adult beetles decreased very appreciably in number. By 
the first of August the larvae had practically all disappeared and 
the adults were quite numerous again, and as further observa¬ 
tions until the first of September failed to show another brood of 
larvae, it is probable that the species is single-brooded in this 
locality, and that the beetles hibernate through the winter and 
with the warming of the ground in spring they appear and lay 
the eggs for the production of the generation of larvae which 
was beginning to appear when I arrived. 
Fig. 2. Beetle on Salix interior showing extent of injury. 
The adult beetles are oblong, oval and vary from 8 — 10 mm. 
in length and from 4—6 mm. in width. The eggs are elliptical, 
of a bright yellow color and have a finely reticulated surface; 
they average .59 mm. in diameter and 1.74 mm. in length and 
are deposited rather promiscuously on the sand under the host 
plant, according to observations made in the insectary. This 
method of egg deposition would seem to agree fairly well with 
that of Disonycha xanthomelaena, yet whether or not this 
method would prevail in nature cannot be said with certainty. 
The eggs require from six to seven days to hatch, the young 
larvae escaping by a longitudinal slit near the end of the egg as in 
xanthomelaena. The larvae are voracious feeders and grow rap¬ 
idly during this entire stage which lasts from twenty-eight to 
thirty days. 
A Coleopterous pupa case was found buried about three inches 
in the sand under one of the willows and although the pupa was 
