PREFACE TO BULLETIN. 



In the course of rather more than three 3^ears' work with the para- 

 sites and natural enemies of the gipsy moth and brown-tail moth, 

 nearly all imported from Europe or Japan, it has been necessary to 

 work with a number of species new to science and to make the most 

 careful life-history observations upon all the species concerned in 

 order to ascertain points of possible importance in the practical 

 handling of the material. It is proposed in this Technical Series No. 

 19 to include a series of short papers giving some of the systematic 

 and biological results of this work, the practical deductions for the 

 most part being reserved for consideration in bulletins of the general 

 series. 



The present paper, therefore, forms the first of such a series. It 

 describes several new egg-parasites and gives some consideration to 

 others already described. It also includes a brief consideration of 

 other forms supposed to have been reared from gipsy moth eggs. 



Technical Series No. 12, Part YI, entitled ''A Record of Results 

 from Rearings and Dissections of Tachinidse," by Charles H. T. 

 Townsend, published September 18, 1908, really should have started 

 this Technical Series No. 19, since it directly concerns itself with 

 results of work at the gipsy moth parasite laboratory. 



The laboratory in question, it should be stated, is now stationed at 

 Melrose Higlilands, Mass. (No. 17 East Highland avenue). It is con- 

 ducted under the joint cooperation of the State of Massachusetts and 

 the U. S. Department of Agriculture. The rental of the building, all 

 construction work, nonexpert assistance, and the expendable sup- 

 plies, together with the compensation of foreign agents, are charged 

 to the State of Massachusetts. The Bureau of Entomology of the 

 Department of Agriculture is charged with the salaries and expenses 

 of all expert assistants and with all nonexpendable supplies and 

 apparatus. 



L. O. H. 



