41 6 proceedings: Entomological society 



An animated cartoon on The black stem rust and the barberry, by Mr. 

 G. D. George, was shown and explained by Dr. H. B. Humphrey. 

 The Hfe story of this rust was shown on the film. The story begins 

 with the winter spores on stubble and wild grass and shows a spore 

 germinating, the sporidia blowing to the barberry bush, the formation 

 of cluster-cups on the barberry leaf, the blowing of a spore to the wheat 

 leaf, its germination and the entrance of the mycelium, through a 

 breathing pore, it branching and spreading within the leaf, and the 

 production and dispersion of the red or summer spores, and their escape 

 through the ruptured epidermis to infect other wheat plants. 



A motion picture showing the opening of the flower of the night- 

 blooming cereus was contributed by Mr. H. PiTTiER. A two-reel film 

 on Citrus fumigation prepared as an educational film by the U. S. De- 

 partment of Agriculture, was also projected. 



The program was followed by a social hour with refreshments. 



Chas. E. Chambliss, Recording Secretary. 



THE ENTOMOLOGICAL SOCIETY OF WASHINGTON 



The 322nd meeting of the Society was held May i, 1919, in the As- 

 sembly Hall of the Cosmos Club, Vice-President Walton presided 

 and there were present 16 members and i visitor. 



program 



A. B. Gahan: The black grain-stem saw fly of Europe in the United 

 States. This paper dealt with Trachelus tabidus (Fab.), the establish- 

 ment of which in the United States has recently been dis- 

 covered. This insect may become a serious pest of small grain, 

 especially wheat, in this country. Some of the points discussed were 

 the distribution both in the United States and in the old world, char- 

 acter of injury, description of adult and larva and comparison with 

 related species, suggestions for control, and bibliography. The illus- 

 trations consisted of drawings of the adult, the larva of this and two 

 allied species of similar habit, and a map of the distribution in the 

 United States. The paper is to be published by the Department of 

 Agriculture. 



In the discussion of Mr. Gahan's paper Mr. Walton stated that Mr. 

 McConnell of the Bureau of Entomology has discovered in Pennsylvania 

 a parasite that killed as high as 30 per cent of the sawfly larvae. Dr. 

 Quaintance remarked that this appears to be one of the few cases in 

 which the necessary measures for insect control conflict with good ag- 

 ricultural practice, the rotation of wheat and clover being undoubtedly 

 good agricultural practice and also favoring reproduction of the insect. 

 Mr. Walton took exception to this, stating that forage experts claim 

 better clover can be raised on plowed ground ; but planting on stubble is 

 easier and cheaper. Mr. Rohwer stated that sawflies are sluggish 

 fliers, and was of the opinion that if in the rotation the fields to be 



