160 BRITISH OAK GALLS. 



Aberrant examples of galls of Ctnips Kollari, Hartig. 



PLATE XXXVI. 



Single Galls : 



1. A very large globular specimen, 27 mm. in diameter. 



2. A typical normal globular specimen, 21 mm. in diameter, with three 



beneath it dwarfed by parasites. 



3. A cluster of five in various stages of development. 



4. 5, 6. Pyriform in shape. 



7, 8. Fully-grown but tenanted by parasites. Note distinct sharp style on 



each gall. 

 9. Developing in a forked twig. 10. Developing in a recurved twig. 



11. A similar specimen. The twig continues as in No. 10. 



12, 13, 14. Distorted by same cause. Appearance as though pinched between 



finger and thumb. 



15. A normal specimen with rough brownish exterior. 



16. A normal specimen with smooth buff exterior. 



17. Completion of development entirely prevented by fvingus. 



18. 19, 20. Completion of development partly prevented by fungus. 



21. Three galls on one twig greatly deformed. 



22. One gall splitting into three parts. 



COALESCENT FoRMS : 



23 to 37. Twin growths, unequal in size. 



38, 39, 40. Each of these contain two larval cells. 



41, 42. Co-equal in size, attached to twig where joined to each other (42 is a 



very fine example). 

 43, 44. Co-equal in size, one only attached to twig ; 31, 32, the same also. 

 45, 46, 47. Each contain three larval cells. 

 48, 49. Each contain four larval cells. 



3 1 , 32, 43, 44, are interesting from the fact that only one gall is attached 

 to the twig ; such forms are not common. 



In the case of specimens without twigs, the point of attachment of the 

 gall is immediately above the figures, except 45, 46, 47, where it is on the 

 right-hand side, and 49 on the left-hand. 



