428 OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE XLIX 



Fig. 1. — The Pine Leaf Scale (Chionaspis pinifoliae). Mainly mature 

 female scales, but on the uppei needle are six smaller scales which are the 

 mature male scales. Note the difference in the width of the female scales, 

 those on the slender needle being very slender, while those on the broader 

 needles are much broader. All mudh enlarged. 



Fig. 2. — The Dogwood Scurfy Scale {Chionas'pis corni). Mainly mature 

 female scales. Enlarged. 



Fig. 3. — The Elm Scurfy Scale (Chionaspis americana). Adult female 

 scales, enlarged. Note the resemblance of this species to the oyster shell bark 

 louse. 



A 



