274 Bulletin Jard. Bo t. Buitenzorg, Série lll, Vol. iV. Livr. 2. 



No. 17, Glochidion hongkongensc M. A. (prob). 

 A leafgall caused by a moth. 



On the underside of the leaf are developed big oval swellings of a light 

 green colour. They are more or less pointed. See figure 13. On the opposite 

 surface of the leaf they are hardly to be seen, except only as small convexities 



or flat swellings which show 

 the place of attachment of the 

 gall. Inside there is a long 

 narrow larval-chamber surround- 

 ed by a thick wall. Often the 

 leaves were totally covered with 

 the galls. 



New-Territory, Sha-Tin, un- 

 derbrush. 10 Nov. 1920. No. 4954. 





Fig. 13. Moth-galls on Glochidion hongkongense 

 M. A, nat. size. 



No. 18. Grewia microcos L. 



A leafgall caused by a gallmite. 



On the uppersurface of the leaf are developed irregularly rounded 

 brown swellings of about 2—4 mm. in diameter. On the other side of the 

 leaf the gall is hardly visible, only a small aperture with a low hairy wall 

 is developed. This gall I hâve found in Singapore, Penang and Bangkok 

 and 1 hâve described it as also occurring in Sumatra. 



In a thin forest on the island of Hongkong; about 150 feet above 

 sealevel. 8 Nov. 1920. No. 4921. 



Literature: D. v. L. Sumatra. No. 19. fig. 19. 



No. 19. Hibiscus mutabilis L. 



A leafgall caused by a gallmite. 



On the upperside of the leaf are developed irregular rounded bladders 

 size from 1 — 10 mm. They are thickly covered with long white hairs. On 

 the underside thèse bladders are covered by a thick velvetlike erineum. 

 Often the whole leaf may be covered by the gallbladders. They can also 

 grow on the leaves of the calyx. 



Hongkong, Botanic Garden. 6 Nov. 1920. No. 4914. 



No. 20. Hibiscus tiliaccus L. 



A leafgall caused by a gallmite: Eriopliyes liibiscitileiis Nal. 



A gall common on tropical beaches and described from many places. 

 Irregular, white, green or reddish bubbles on the upperside of the 

 leaf. Thèse are also developed on the underside of the leafblade, where 

 the opening of the gall is found. 



Hongkong, on the beach, 8 Nov. 1920. No. 4931. 



New-Territory, Sha-Tin, roadside near the railwaystation. 10 Nov. 1920. 

 No. 4949. 



