OF WASHINGTON. 139 



placed in the subfamily Chalcidinas by Westwood, and which he 

 himself considers to be a Eurytomine. He also showed a Dia- 

 priine from Brazil, which has a remarkable pronotal projection, 

 and for which he proposes to erect a new genus, Notoxoides, on 

 account of the superficial resemblance of the form to the cole 

 opterous genus Notoxus. 



Mr. Hubbard exhibited specimens of the Colorado Potato- 

 Beetle, collected at Fort Assiniboine, Montana, hundreds of miles 

 from fields of cultivated potatoes. The only potatoes grown at 

 that point occur in a small patch at the fort, and these are not 

 touched by the insects, which breed exclusively upon a wild 

 Solanum growing on the mounds of the prairie dogs. The dogs 

 remove all other vegetation from the mounds, but this Solanum 

 remains. These beetles have, therefore, not come in contact 

 with the cultivated potato, and yet show no variation from the 

 form now common in the East. 



FEBRUARY 28, 1894. 



President Ash mead occupied the chair, and there were also 

 present Messrs. Uhler, Schwarz, Gill, Stiles, Marlatt, Benton, 

 Marx, Sudworth, Heidemann, Fernow, Kuehling, Dodge, Test, 

 and Howard. There were also present, as guests of the Society, 

 Prof. E. B. Poulton, of Oxford University, England ; Prof . Les 

 ter F. Ward, Hon. Chas. W. Dabney, Jr., Dr. Frank Baker, Prof. 

 W. H. Ball, Prof. F. H. Knowlton, Mr. F. A. Lucas, Mr. B. 

 T. Galloway, Dr. Tarleton H. Bean, Mr. Richard Rathbun, 

 Mr. Francis E. Leupp, and Mr. Filibert Roth. 



President Ashmead introduced Prof. E. B. Poulton, who ad 

 dressed the Society. The object of his paper was to bring for 

 ward a series of illustrations of recent work upon the uses of 

 colors to insects in the struggle for existence. 



First, as regards Colors for Concealment, two examples were 

 shown of a method of illustration for popular audiences. An 

 insect is first represented upon some plain background, and then, 

 in a second slide, in its appropriate environment, the slides being 

 so painted and arranged that the insect appears upon the screen 



