48 Annals Entomological Society of America [Vol. XII, 



acid. The effect of the fluid on the skin is such as to cause 

 burning and itching similar to the effect of the common plant 

 known as "nettles." However, this effect is not so noticeable 

 unless the quantity falling on the hand is of considerable 

 amount. 



It is hoped that opportunity may be found next year for 

 further observations and experiments on these glands in other 

 members of the genus. 



The authors desire to expn^ss their acknowledgment to 

 Miss Ellen Edmonson for her careful reproduction of the 

 spray pattern in Figure 1. 



