DOCTERS VAN Leeuwe n : GalLs of Krakatau and Sebesy. 307 



The leaf along the mid-rib is svvoUen and folded so as to form a 

 long canal. The colour of this curious gall is dark green. Very common 

 in Java on cultivated plants. 



Sebesy, native village, April 25th 1921. No. 5329. 



Literature: D. v. L. Java II. No. 77. fig. 44. 



No. 59. Piper retrofractum VAHL. 



A leaf-gall formed by a thrips: Gynaikothrips chavicac (ZiMM.). 



Common in Java. Twisting and rolling of both sides of the leaf-blade. 

 See figure 15. 



Sebesy, Cocos-jungle, April 22th 1921. No. 5127. Idem, forest, about 

 100 M, April 28th 1921. No. 5397. 



Literature: D. v. L. Java lll. No. 133. 



Fig. 15. A thrips gall on Piper retrofractum Vahl. X 1. 



No. 60. Piper sarmentosum BL. 



A leaf-gall formed by a thrips: Gynaikothrips pallipcs Karny. 



Almost the same gall as the foregoing, but rolling only slightly and 

 accompanied with yellow colouring. 



When older they are covered W\W\ white outgrowths which hâve been 

 described by me from Java. In the galls occurred also Gynaikothrips 

 chavicae (ZiMM.). 



Sebesy, Cocos-jungle, April 22th No. 5085. 



Literature: D. v. L. Java VII. No. 478. 



D. V. L. Ueber die von Gynaikothrips pallipes Karny on Piper sarmen- 

 tosum Bl. verursachten FJlattgallen. Marcellia. Vol. XIII. 1914. p. 127. 



No. 61. Pipturus incanus MiERS. 

 A leaf-gall caused bij a gall-mite. 



Common in Krakatau and already described of this island. Small white 

 excrescences of the leaf-blade. 



