OF WASHINGTON. 27 



the present state of knowledge does not offer any great hope 

 of results of value so far as this class of enemies is concerned. 

 In the case of predaceous enemies the case is different, and it 

 may be that much benefit may yet be derived from them when 

 their habits have become better known, and the possibilities 

 and limitations of each species defined. The introduction of 

 species into localities beyond their natural range is, of course, 

 the most obvious method of utilizing them, and good oppor- 

 tunities exist for experimentation along this line without over- 

 stepping the limits of the United States. The most destructive 

 enemies of the western forests are represented in the East by 

 closely related forms. Both in the East and in the West these 

 pests are partially controlled by natural enemies which are not 

 the same in the two localities, and it is possible that a mutual 

 interchange of these might result beneficially. Some years 

 ago Dr. A. D. Hopkins introduced into West Virginia an im- 

 portant European enemy of barkbeetles, but the disappearance 

 of the beetle which it was desired to control was brought 

 about by other causes, and the success or failure of the experi- 

 ment lost its significance. Attempts of this nature are, of 

 course, very liable to failure, but the necessary expense is so 

 small in comparison with the benefits possible if the results are 

 successful, that very long chances may be taken and still leave 

 good margin for profit. Other methods by which it might be 

 possible to utilize a knowledge of parasites and enemies con- 

 stantly suggest themselves as we determine definite facts in 

 their habits and life history. 



April 4, 1907. 



The 213th regular meeting was held at the residence of Mr. 

 J. D. Patten, 2212 R street, N. W., President Hopkins in the 

 chair and the following members present: Messrs. Barber, 

 Barrett, Benton, Burke, Banks, Caudell, Dyar, Heidemann, 

 Hopkins, Howard, Knab, Marlatt, Morris, Patten, Sanders, 

 Schwarz, Stiles, and Titus. Mr. J. H. Emerton, of Boston, 

 was present as a visitor. 



Mr. C. S. Spooner, of the Bureau of Entomology, U. S. 

 Department of Agriculture, and Messrs. G. P. Weldon and 

 A. B. Gahan, assistant entomologists of the Maryland Agricul- 

 tural College Experiment Station, were elected active members. 



Dr. Howard exhibited a number of new species and genera 



