Sept., I9I2.] MaTHESON : HALIPLID.E OF NORTH AMERICA. 185 



except for the eyes, till the time of the emergence of the adult. The 

 head lies curved under the prothorax and between the developing 

 forelegs, smooth except for two set?e placed between the eyes. Pro- 



FiG. B. Pupa of P. edentulus, dorsal view. 



notum with ten long, curved, unjointed spines, four on the anterior, 

 two on each lateral and two on the posterior, margins. These 

 spines prevent the anterior end of the pupa from touching the 

 soil in its pupal chamber. Abdomen of eight segments, each bearing 

 on its dorsal surface four long, unjointed spines, two lateral and 

 two dorsal. Between the dorsal spines are two shorter, small 

 spines present on each segment except the last two. These long, 

 curving spines prevent the delicate abdomen from touching the soil. 

 Ventral surface of abdomen smooth. The pupa lies on its back in 

 its pupal chamber and the spines just described support and protect 

 it from contact with the soil. The caudal end of the pupa is also 

 provided with a few short spines. There are two thoracic and seven 

 abdominal spiracles present. 



Adult. — The pupa changes to the adult about two weeks after pupa- 

 tion. The adult is at first perfectly soft and colorless except for the 

 pigmented eyes. It requires several days before the adult beetle has 

 attained its full color and is ready to leave the pupal chamber. In 



