Synoptical Table of Oak Galls. 1 7 1 



Apex of a terminal twig inflated, longer than broad, 

 large cavity with loose, small inner gall, June. 



8^. Aiidricus inflator. 

 Irregular swellings on twig, petiole, or mid-rib, June. 



5^. Andricus noduli. 



III. On Roots. 



Polythalamous, woody when mature, large, brown, 

 irregular, 1-3 inches, on roots, Oct. 



5. Aphilotvix radicis. 



Monothalamous : on rootlets, often in clusters, irregular, 

 Sept. 17. Biorhiza aptera. 



IV. On Bark and thick Roots. 



Or on scars, egg-shaped, becoming honey-combed 

 when old. Sept. 7. Aphilotvix corticis. 



On young branches, hke barnacles, red when young, 

 brownish when old, often covered with gummy 

 secretion, June — Aug. 6. Aphilotrix Sieboldi. 



V. On Catkins. 



In a mass of w^oolly hair. 

 Mass agglomerated, dense, 20 mm., June. 



13=*. Andncits rmnuli. 



Hair scanty, May and June. 



II*. Andricus cirratits. 

 Not in a mass of woolly hair. 

 Pilose, brownish, 2 mm., oval. May and June. 



10*. Andricus pilosus. 

 Glabrous : 

 Currant-like, May. i^. Spathegaster baccarum. 



Spindle-shaped, short peduncle, green with red ribs, 

 apex pointed, 6-8 mm.. May and June. 



20. Aphilotrix seminationis. 



Obovoid, ribbed sides, base not contracted, 3 mm., 

 May. 22. Aphilotrix quadrilineata. 



Sides not ribbed, 1-2 mm., in May. 



12*. Andricus nudus. 



