Vol. xxiii] ENTOMOLOGICAL NEWS. 347 



THE POISONOUS NATURE OF THE; ODOR OF EUSCHISTUS: 



One June I, 1909, four adults of a species of Euschistus, 

 captured in a clump of weeds, were confined together in a ho- 

 meopathic vial, closely stoppered, from n A. M. to 2.08 P. M., 

 or for slightly over three hours. They were then carefully re- 

 moved. An adult Me gill a maculata De Geer was added to 

 the vial, controlled by an adult kept in a clean vial. No ap- 

 parent effect. 



The four bugs having been placed together in a stender dish, 

 on the following day their odor was very perceptible and al 

 7 A. M. an adult of Tyloderma fovcolatum Say was placed 

 in with them. A similar stender dish contained a control adult. 

 No effect resulted. It is probable here that the protective 

 vapor of these insects had already been dissipated before the 

 experiments. 







THE POISONOUS NATURE OF THE ODOR OF BROCHYMENA: 



An adult Brochymena was captured from apple at 8 A. M.. 

 May 14, 1909, and was at once confined in a homeopathic vial 

 for twenty-four hours, occasionally being roughly shaken up. 

 The vial was closely stoppered. At 8 A. M., May 15, the still 

 living bug was hastily removed ; the vial contained then a very 

 faint sweetish odor. A control vial was prepared. 



(i). At 8.10 A. M., May 15, a worker of Lasius n'ujcr amc- 

 ricanus was introduced into each vial. Both ants at once began 

 to crawl about, acting normally. No change up to n A. M., 

 when both were apparently normal. When the bug was re- 

 moved from the first vial it was hastily transferred to another, 

 smaller one in which it died at nine o'clock ; this vial contained 

 filter paper to absorb moisture. The experiment ant was 

 removed to this vial at 11.05 A. M., the control removed to a 

 similar, but clean vial. The second experiment vial now con- 

 tained the dead Brochymena and had a pronounced odor given 

 off by the bug when it was confined at 7 A. M., or else when it 

 died. Three minutes afterwards, the experiment ant showed 

 convulsive movements but continued to crawl feebly; a minute 



