146 THE OAK GALLS AND GALL INSECTS 



sexual forms. The agamic forms also have hairs on the 

 antennae, and the ventral spine is thickly haired. There is no 

 sculpture on the mesothorax of the sexual generation. The 

 chief difference is in the ovipositor, which in the agamic forms 

 is long, slightly curved, and straight at the point, while the 

 sexual generation has the ovipositor short and somewhat hooked 

 at the end. This difference is due to the fact that in the former 

 case the eggs are laid in the bud, and in the latter they are laid 

 in the leaf. As pointed out by Dr. Adler, the study of the 

 ovipositors of the gall-making Cynipidae is very important, as 

 some forms, such as the sexual forms of the Dvyophanta group 

 and the corresponding forms of the genus Nenvotevus, are almost 

 identical, except for the differences existing between the 

 ovipositors. 



SYNOPSIS OF GALLS OF THE AGAMIC GENERATIONS 

 OF THE GENUS DRYOPHANTA. 



In this genus, the galls giving rise to the agamic generation 

 are very similar in character, all being circular and found on the 

 veins at the back of the leaf. 



1. (6) Hard and woody. 



2. (5) Larval cavity small, walls thick.. .. .. D. longiveutvis 



3. (4) Top depressed with an elongated elevation in the 



centre of the depression . . • • D, disticJia 



4. (3) Top depressed with no elongated elevation in the 



centre of the depression .. .. £), divisci 



5,(2) Larval cavity large, walls thin .. .. D. agama 



6.(1) Soft and spongy .. .. .. £),folii 



I was unable to find any specimens of D. disticha in Eppin"- 

 Forest. 



(7). Agamic Generation. I. Dryophanta folii (Linn). 



Inquilines. Synergiis pallicornis (Htg.), 5. tscheki (Mayr) and 

 S. vulgaris (Htg.) 



Gall. 



Appears on the under-surface of the leaf, arising from the 

 leaf vein with which it is connected by a small point. Two or 

 three may be found on one leat. Coloiiv : Green when young 

 becoming yellowish, the exposed side of the gall is often red. 

 Shape : Globular. This gall, which varies much in size and is 



