14 CALOSOMA SYCOPHANTA. 



the colonies where beetles were liberated each year, so that their 

 spread and increase could be followed as accurately as possible from 

 year to year. 



September 1, 1907, the writer was appointed as expert in charge of 

 breeding experiments in this bureau, and since that time has been 

 engaged in the work during the summers, while the winters have 

 been devoted to other lines of work in Washington. Mr. C. W. Col- 

 lins, as already stated, has been engaged in the work almost continu- 

 ously except for a part of the time each winter when other work 

 required his attention. April 1, 1909, he was appointed an expert 

 in this bureau. 



During the summer of 1908 Mr. C. W. Stockwell assisted in the 

 rearing work; in 1909 a considerable amount of this work was attended 

 to by Messrs. P. H. Timberlake and S. S. Crossman; and in 1910 

 Messrs. K. W. Brown, J. J. Culver, and R. G. Smith were similarly 

 engaged. Many of the valuable records that are included are the 

 result of the careful work of these men who, with Mr. Collins, per- 

 formed most of the tedious work of feeding the various species under 

 observation and kept daily records of the experiments. Mention 

 should also be made of the valuable notes contributed by Messrs. 

 J. V. Schaffner, jr., and E. A. Proctor, who have been engaged in 

 making field observations in the colonies that have been liberated. 



The writer is also under obligation to Mr. W. F. Fiske for his gen- 

 eral interest and many helpful suggestions; to Mr. F. H. Mosher and 

 various members of the staff of the State foresters' office for sugges- 

 tions and information concerning field conditions; to Mr. H. R. Gooch, 

 who constructed most of the apparatus used; and to Messrs. H. S. 

 Barber and W. N. Dovener for preparing the illustrations accompany- 

 ing this report. 



The facts brought out in the investigations that have been carried 

 on will be given first, as these have an important bearing on the 

 colonization work which will be described in detail later in the report. 



The data which follow refer chiefly to Calosoma sycophanta, as this 

 species has been imported in greatest numbers. Others have been 

 given such study as was possible, and it is hoped that more indi- 

 viduals may be received, so that further investigations and liberations 

 can be made. 



INVESTIGATIONAL WORK ON CALOSOMA SYCOPHANTA. 



In 1906 the investigational work was carried on by Messrs. Titus 

 and Mosher, and some notes and observations were made by Mr. 

 R. L. Webster. During the following summer Mr. Mosher attended 

 to the work until it was taken up by the writer. Beetles were con- 

 fined in large cages covered with cheesecloth, where they were sup- 

 plied with caterpillars for food. Several styles of cages were used, 

 and these were located in woodland near the laboratory at North 



