Tech, Series 20, Part I, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate XVI. 



Work of Pissodes yosemite and P. schwarzi. 



A.— P. yosemite: Work in wood and bark. (Author's illustration.) B.~P. schu;ar:i: 

 Work in wood and bark. (Original.) 



