PLATE CXXIII. 



Phylloxera quercus. (Page 49.) 



Fig. 1. — The queen; her whole body is studded 

 with tubercular processes with large heads. She 

 surrounds herself with irregular patches of shining 

 green eggs. 



Fig. 2. — The same insect seen from the under side. 



Fig. 3. — Smaller and smoother individual taken in 

 company with the last. 



Fig. 4. — Imago showing the porrected vertex. 



Fig. 5. — Head and antenna of the same. 



Fig. 6. — Antenna much magnified to show the long 

 apical channel c covered by membrane, and the circular 

 pits d on the second joint, a. Porrected tubercles. 

 o. Ocellus. 



Fig. 7. — Tarsus and claws of imago. 



Fig. 8. — Antenna and tubercles of Fig. 1. b. 

 Tubercles. 



Fig. 9. — Simple eye of the last insect. 



Fig. 10. — Part of the under side of an oak leaf 

 showing the yellow patch caused by the Phylloxera. 

 The eggs and larva? are in situ. 



For purposes of comparison I figure : 

 Fig. 11. — Antenna of Ph. punctata. 

 Fig. 12. — Antenna and horny processes of the 

 larva of Ph. coccinea. 



Fig. 13. — Antenna of the imago of Ph. coccinea. 



