312 Bulletin Jard. Bot. Buitenzorg, Série III, Vol. IV. Livr. 2. 



Fig. 19. A midgc-gall on Vitis trifolia L. X 1. 



shoots. The internodes remain 

 shorter and the leaves remain 

 smaller and accumulated. See the 

 figure 19. 



Sebesy, in a marsh, April 

 24th IQ21. No. 5207. 



No. 80. Wcdelia biflora 

 D. C. 



A leaf-gall formed by a gali- 

 mite. 



Common on the beach of 

 tropical countries. Small excres- 

 cences among the ramifications 

 of the veins; and already 

 described from Krakatau. 



Krakatau, Apri! 24th 1919. 

 No. 3543. 



Verlaten-island, April 22nd 

 1920. No. 4029. 



Sebesy, April 27th 1921. 

 No. 5336. 



Literature: D. v. L. Krakatau. 

 No. 23. figure 23. 



No. 81. Wcdeiia biflora D. C. 

 A leaf-gall caused by an aphid: Aphis malvac KOCH. 

 Common on tropical beaches, and already described from Krakatau. 

 Bunches of poorly developed, shrivelled and curved leaves. 

 Verlaten-island, April 27th 1919. No. 3727b; idem October 6th 1919. 

 No. 3832; idem April 24th 1920. No. 4113. 

 Sebesy, April 24th 1921. No. 5226. 



* No. 82. Wcdelia biflora D. C 



A bud-gall caused by a dipteron. 



This gall is known to me from Java, but 

 not yet described. The bunch in the axilla of 

 the leaves develop into ball-shaped or fusiform 

 swellings of a dark green colour. Inside there 

 is a wide larval chamber tenanted by the white 

 larva of a dipteron. The growing point may 

 develop into a short young twig. See figure 20. 



Verlaten-island, April 26th 1921. No. 5332. 



Sebesy, April 24th 1921. No. 5229. 



Fig. 20. A dipterncecidium on 

 Wcdelia biflora DC.X 1. 



