i, 
The value of a knowledge of effective temperatures is well illustrated 
in the case of the Hessian fly, and if we had more exact data of this 
character concerning many of our pests it is not improbable that 
valuable suggestions in their control would result. The paucity of 
exact knowledge on some of these points with so common a species as 
the cotton bollworm was brought to my attention recently in the 
course of an attempt to determine the number of generations of this 
species throughout the United States and Canada. Insects of such 
wide distribution offer exceptional opportunities for studying the 
laws of temperature limitations and other factors of the greatest 
interest and probable value. On such problems cooperation must 
necessarily be secured. The desirability of this has often been the 
occasion of. remark in the proceedings of this Association and else- 
where, but its accomphshment appears no nearer realization than 
during the early days of the society. 
Recent years have witnessed an important change of sentiment with 
regard to insect legislation, and its extent at the present day may 
doubtless be held as proot of its recognized value. However this may 
be, the fact remains that, with few exceptions, the various States. 
have adopted laws which have for their end the restriction of one or 
more species and, in numerous instances, the enforced control of pests 
already established. 
A recent census of legislation in the United States bearing on the 
control of insect pests shows that of the forty-eight States and Terri- 
tories the following only are yet without operative laws, and some of 
these have bills in preparation for passage at coming legislative 
assemblies: Arizona, Florida, Kansas, Nebraska, Nevada, New Mex- 
ico, Oklahoma, South Dakota, Texas, Vermont, and Wyoming. The 
following insects are mentioned as coming under the operation of 
various laws, and in many cases provision is made for the designation 
of other species which at any time it may be judged desirable to quar- 
antine or whose control should be enforced. 
PHYTOPTID®. 
Pear blister mite (Hriophyes pyri Pagenst.). 
ORTHOPTERA. 
Grasshoppers (Melanoplus spretus 'Thos.; M. atlanis Riley; M. bivittatus Say, 
etc. ). 
HEMIPTERA. 
San Jose scale (Aspidiotus perniciosus Comst.). 
Cherry scale (Aspidiotus forbesi Johns. ). 
European fruit-scale (Aspidiotus ostreeformis Curt.). 
Greedy scale (Aspidiotus rapaxr Comst.). 
Walnut scale (Aspidiotus juglans-regiew Comst. ). 
