Annals E. S. A. 



Vol. IX, Plate XII. 



William Mooie 



EXPLANATION OF PLATE X. 

 L Photomicrograph of soft scale, Coccus sp., after treatment with osmic acid. 



2. Photomicrograph of mealy bug after treatment with osmic acid. 



3. Photomicrograph of the anterior portion of immature white fly, showing pen- 



etration of osmic acid through the spiracles and along the trachea. 



4. A portion of the soft scale, showing wax glands with dots caused by osmic acid. 



