DOCTERS VAN Leeuwen : Galls of Krcikataii and Sebesy. 297 



Besides the above named thrips also Gynaikothrips gracilis Karny 

 vvas found on the leaves, 



Sebesy-island, Cocos-jungle, April 22nd 1Q21. No. 50Q5. 



No. IQ. Ficus fistulosa REINW. 



A leaf-gall caused by a gall-mite. 



Already described from Krakatau. Granular accu- 

 mulations on the undersurface of the leaf. The galls of 

 Krakatau are very small (average size of the irregular 

 excrescences 1 — 2 mM.), those of Sebesy are much bigger 

 (average size about 12 mM). 



Krakatau-Island, about 800 M. April 26th 1919, 

 No. 3690; ait 100 M. January 20th. 1922. N. 6008. 



Sebesy-island, secondary forest, April 23th 1921. 

 No. 5132. 



Literatiire: D. v. L. Krakatau. No. 3. figure 4. 



m^\ 





m 



il'i 



vsti^j 



Fig. 7. A midge-gall 

 on Ficus fistulosa 

 Reinw.X 1- 



Fig. 8, A midge-gall on Ficus 

 gibbosa Bl. X 1. 



* No. 20. Ficus 

 fistulosa REîNW. 



A leaf-gall caused 

 by a gall-midge. 



On thebark of the 

 twigs are developed 

 irregular corky out- 

 growths which consist 

 of a great number of 

 small galls. Each gall has a iarval chamber 

 tenanted by a small gall-midge larva. See 

 accompanying figure 7. 



Average size 20—50 mM ; depth of the 

 gall layer about 3 mM. 



Sebesy-island, forest, about 200 M, 

 April 25th 1921. No. 5268. 



* No. 21. Ficus gibbosa BL. 



A leaf-gall caused by a gall-midge (prob). 



The galls are developed on both sides 

 of the leaf-blade. On the uppersurface they 

 are flat, semi-ballshaped excrescences of a 

 dark-green colour, on the undersurface they 

 are more irregular, also semi-ballshaped, or 

 more or less conical. See figure 8. The galls 

 having been abandoned by their inhabitants, 

 1 am tôt quite sure about the group to which 

 they belong. Average size about 2'/4 mM. 



