6o 



COLORATION IN POLISTES. 



CORRELATION BETWEEN MARKINGS OF SECOND ABDOMINAL SEGMENT AND 

 CLYPEUS OF FEMALE. 



With respect to coloration of the clypeus, the material falls into five 

 classes : 



Class i. Red-brown with prominent yellow border. 



Class 2. Red-brown with yellow persisting occasionally at tip. 



Class 3. Red-brown with black spot or dot. 



Class 4. Black and red-brown in about equal amounts. 



Class 5. Entirely black. 



Classes according to the markings of clypeus are arranged vertically ; 

 those according to the markings of abdomen are arranged horizontally. 



