Some Reactions of Brachinus Lateralis 



Some account is here given of experiments made with this bom- 

 barder beetle. The experiments were performed by Miss 

 L. Myers and W. A. Hilton. 



Beetles that had been irritated for some time failed to respond 

 after a period, such specimens when killed and examined showed 

 the anal sacs somewhat contracted. 



Beetles killed before exhaustion seemed to show the sacks dis- 

 tended with gas if killed quickly. 



Beetles stimulated after the removal of the head threw out gas 

 as when the head was present. When the head was attached the 

 animals could be made to react no matter whether head or body 

 was touched. 



The last abdominal ganglion of this beetle is quite large and 

 has several nerves running to the glands and the anal sacs. 



( Coniribulion from the Zoological Laboratory of Pomona College) 



