OF WASHINGTON, VOLUME XII, 1910. 



71 



closely resembled that they were not noticed until the plant 

 was taken out of its envelope and examined closely, and then 

 only when they moved. After death the legs and wings un- 

 folded to some extent, showing the black body, thus partly 



J 



FIG. 1. Campylenchia curval/i ;md host plant. 



destroying the resemblance. Seeds of the plant were also 

 shown, and a drawing by Mr. Strauss, indicating the insects 

 and seeds in position. The case is an extraordinarily perfect 

 one of special protective resemblance. The mernbracid in 

 question is widely distributed in the United States and has a 

 variety of food-plants, the resemblance, however, being most 

 effective when feeding upon this species of Astragalus. 



