290 Bulletin Jard. Bot. Bui tenzorg, Série 111, Vol. IV. Livr. 2. 



the créatures are transportée!, but also of the condition of tiie flora. The 

 sparse forest, the open spaces especially on the former island are more 

 conducive to the development of mite-galls than of the more aqueous galls 

 formed by gall-midges, as was also discussed already in mij older article, 



Out of the 82 galls, IQ occur both on Krakatau (inclusive of Verlaten 

 Eiland) and on Sebesy; 25 are entirely new to me or not yet described 

 and hâve been marked in this article with an *. 



Ail the finding-places and numbers also from the former publication 

 hâve been noted again. The materials are accordingly to be consulted 

 afterwards at the Herbarium of the Botanical Oardens of Buitenzorg. 



The spreading of the mite-gall on Ficus hispida L. is peculiar. This 

 gall was already described by me as occurring on Sumatra (under the 

 wrong name of Ficus liirta BL). 1 found this gall very abundantiy on 

 Sumatra and also on my tour through Malacca, in Singapore, Kuala Lumpur, 

 Penang, Bangkok and Saigon, but thus far 1 hâve not yet found it in Java, 

 though this variety of Ficus is quite common hère and 1 hâve repeatedly 

 paid attention to it. Concerning this gall we are therefore probably justified 

 in assuming that the mites made their way to thèse islands from Sumatra. 

 Another fact militating for this view is that it is quite abundant on the 

 island of Sebesy, which is situated near to Sumatra; v^hereas on Krakatau, 

 where that species of tree is also very abundantiy found, 1 only found one 

 spécimen there, and not till my third excursion. 



On Krakatau 1 found on 4 excursions, 44 forms of galls ; out of this total 



23 produced by gall-mites. 



On Sebesy were found on two excursions 57 forms of galls, 

 24 produced by gall-mites. 



Unfortunately the proof-reader in Holland made some confusing altérat- 

 ions in the text of my former article, without my knowledge. Not only 

 has the punctuation been entirely changed, but some sentences hâve been 

 altered in such a way, or words hâve been added, that the sensé has been 



